{
  "ticker": "FBIZ",
  "name": "FIRST BUSINESS FINANCIAL SERVICES, INC.",
  "cik": "0001521951",
  "sic": "6022",
  "sic_description": "State Commercial Banks",
  "source": "SEC XBRL companyfacts",
  "source_url": "https://data.sec.gov/api/xbrl/companyfacts/CIK0001521951.json",
  "as_of": "2026-02-25",
  "note": "Verified SEC companyfacts-derived facts; derived metrics (margins, ratios, free cash flow) are computed from those facts. Descriptive data, not investment advice.",
  "annual": [
    {
      "metric_id": "revenue",
      "label": "Revenue",
      "concept": "InterestAndDividendIncomeOperating",
      "unit": "USD",
      "derived": false,
      "source_concepts": [
        "us-gaap:InterestAndDividendIncomeOperating"
      ],
      "points": [
        {
          "fiscal_year": 2016,
          "period_end": "2016-12-31",
          "value": 78117000.0,
          "filed": "2019-02-28",
          "accession": "0001521951-19-000019"
        },
        {
          "fiscal_year": 2017,
          "period_end": "2017-12-31",
          "value": 75811000.0,
          "filed": "2019-02-28",
          "accession": "0001521951-19-000019"
        },
        {
          "fiscal_year": 2018,
          "period_end": "2018-12-31",
          "value": 91275000.0,
          "filed": "2020-02-27",
          "accession": "0001521951-20-000014"
        },
        {
          "fiscal_year": 2019,
          "period_end": "2019-12-31",
          "value": 102040000.0,
          "filed": "2021-02-24",
          "accession": "0001521951-21-000028"
        },
        {
          "fiscal_year": 2020,
          "period_end": "2020-12-31",
          "value": 94179000.0,
          "filed": "2023-02-22",
          "accession": "0001521951-23-000028"
        },
        {
          "fiscal_year": 2021,
          "period_end": "2021-12-31",
          "value": 95995000.0,
          "filed": "2024-02-28",
          "accession": "0001521951-24-000020"
        },
        {
          "fiscal_year": 2022,
          "period_end": "2022-12-31",
          "value": 121371000.0,
          "filed": "2025-02-26",
          "accession": "0000950170-25-027715"
        },
        {
          "fiscal_year": 2023,
          "period_end": "2023-12-31",
          "value": 194928000.0,
          "filed": "2026-02-25",
          "accession": "0001193125-26-071523"
        },
        {
          "fiscal_year": 2024,
          "period_end": "2024-12-31",
          "value": 233130000.0,
          "filed": "2026-02-25",
          "accession": "0001193125-26-071523"
        },
        {
          "fiscal_year": 2025,
          "period_end": "2025-12-31",
          "value": 247310000.0,
          "filed": "2026-02-25",
          "accession": "0001193125-26-071523"
        }
      ]
    },
    {
      "metric_id": "net_income",
      "label": "Net income",
      "concept": "NetIncomeLoss",
      "unit": "USD",
      "derived": false,
      "source_concepts": [
        "us-gaap:NetIncomeLoss"
      ],
      "points": [
        {
          "fiscal_year": 2016,
          "period_end": "2016-12-31",
          "value": 14909000.0,
          "filed": "2019-02-28",
          "accession": "0001521951-19-000019"
        },
        {
          "fiscal_year": 2017,
          "period_end": "2017-12-31",
          "value": 11905000.0,
          "filed": "2019-02-28",
          "accession": "0001521951-19-000019"
        },
        {
          "fiscal_year": 2018,
          "period_end": "2018-12-31",
          "value": 16303000.0,
          "filed": "2020-02-27",
          "accession": "0001521951-20-000014"
        },
        {
          "fiscal_year": 2019,
          "period_end": "2019-12-31",
          "value": 23324000.0,
          "filed": "2021-02-24",
          "accession": "0001521951-21-000028"
        },
        {
          "fiscal_year": 2020,
          "period_end": "2020-12-31",
          "value": 16978000.0,
          "filed": "2023-02-22",
          "accession": "0001521951-23-000028"
        },
        {
          "fiscal_year": 2021,
          "period_end": "2021-12-31",
          "value": 35755000.0,
          "filed": "2024-02-28",
          "accession": "0001521951-24-000020"
        },
        {
          "fiscal_year": 2022,
          "period_end": "2022-12-31",
          "value": 40858000.0,
          "filed": "2025-02-26",
          "accession": "0000950170-25-027715"
        },
        {
          "fiscal_year": 2023,
          "period_end": "2023-12-31",
          "value": 37027000.0,
          "filed": "2026-02-25",
          "accession": "0001193125-26-071523"
        },
        {
          "fiscal_year": 2024,
          "period_end": "2024-12-31",
          "value": 44245000.0,
          "filed": "2026-02-25",
          "accession": "0001193125-26-071523"
        },
        {
          "fiscal_year": 2025,
          "period_end": "2025-12-31",
          "value": 50319000.0,
          "filed": "2026-02-25",
          "accession": "0001193125-26-071523"
        }
      ]
    },
    {
      "metric_id": "eps_diluted",
      "label": "Diluted EPS",
      "concept": "EarningsPerShareDiluted",
      "unit": "USD/shares",
      "derived": false,
      "source_concepts": [
        "us-gaap:EarningsPerShareDiluted"
      ],
      "points": [
        {
          "fiscal_year": 2016,
          "period_end": "2016-12-31",
          "value": 1.71,
          "filed": "2019-02-28",
          "accession": "0001521951-19-000019"
        },
        {
          "fiscal_year": 2017,
          "period_end": "2017-12-31",
          "value": 1.36,
          "filed": "2019-02-28",
          "accession": "0001521951-19-000019"
        },
        {
          "fiscal_year": 2018,
          "period_end": "2018-12-31",
          "value": 1.86,
          "filed": "2020-02-27",
          "accession": "0001521951-20-000014"
        },
        {
          "fiscal_year": 2019,
          "period_end": "2019-12-31",
          "value": 2.68,
          "filed": "2021-02-24",
          "accession": "0001521951-21-000028"
        },
        {
          "fiscal_year": 2020,
          "period_end": "2020-12-31",
          "value": 1.97,
          "filed": "2023-02-22",
          "accession": "0001521951-23-000028"
        },
        {
          "fiscal_year": 2021,
          "period_end": "2021-12-31",
          "value": 4.17,
          "filed": "2024-02-28",
          "accession": "0001521951-24-000020"
        },
        {
          "fiscal_year": 2022,
          "period_end": "2022-12-31",
          "value": 4.75,
          "filed": "2025-02-26",
          "accession": "0000950170-25-027715"
        },
        {
          "fiscal_year": 2023,
          "period_end": "2023-12-31",
          "value": 4.33,
          "filed": "2026-02-25",
          "accession": "0001193125-26-071523"
        },
        {
          "fiscal_year": 2024,
          "period_end": "2024-12-31",
          "value": 5.2,
          "filed": "2026-02-25",
          "accession": "0001193125-26-071523"
        },
        {
          "fiscal_year": 2025,
          "period_end": "2025-12-31",
          "value": 5.94,
          "filed": "2026-02-25",
          "accession": "0001193125-26-071523"
        }
      ]
    },
    {
      "metric_id": "operating_cash_flow",
      "label": "Operating cash flow",
      "concept": "NetCashProvidedByUsedInOperatingActivities",
      "unit": "USD",
      "derived": false,
      "source_concepts": [
        "us-gaap:NetCashProvidedByUsedInOperatingActivities"
      ],
      "points": [
        {
          "fiscal_year": 2016,
          "period_end": "2016-12-31",
          "value": 26162000.0,
          "filed": "2019-02-28",
          "accession": "0001521951-19-000019"
        },
        {
          "fiscal_year": 2017,
          "period_end": "2017-12-31",
          "value": 22408000.0,
          "filed": "2019-02-28",
          "accession": "0001521951-19-000019"
        },
        {
          "fiscal_year": 2018,
          "period_end": "2018-12-31",
          "value": 25281000.0,
          "filed": "2020-02-27",
          "accession": "0001521951-20-000014"
        },
        {
          "fiscal_year": 2019,
          "period_end": "2019-12-31",
          "value": 28985000.0,
          "filed": "2021-02-24",
          "accession": "0001521951-21-000028"
        },
        {
          "fiscal_year": 2020,
          "period_end": "2020-12-31",
          "value": 26635000.0,
          "filed": "2023-02-22",
          "accession": "0001521951-23-000028"
        },
        {
          "fiscal_year": 2021,
          "period_end": "2021-12-31",
          "value": 35992000.0,
          "filed": "2024-02-28",
          "accession": "0001521951-24-000020"
        },
        {
          "fiscal_year": 2022,
          "period_end": "2022-12-31",
          "value": 38645000.0,
          "filed": "2025-02-26",
          "accession": "0000950170-25-027715"
        },
        {
          "fiscal_year": 2023,
          "period_end": "2023-12-31",
          "value": 52292000.0,
          "filed": "2026-02-25",
          "accession": "0001193125-26-071523"
        },
        {
          "fiscal_year": 2024,
          "period_end": "2024-12-31",
          "value": 57491000.0,
          "filed": "2026-02-25",
          "accession": "0001193125-26-071523"
        },
        {
          "fiscal_year": 2025,
          "period_end": "2025-12-31",
          "value": 61696000.0,
          "filed": "2026-02-25",
          "accession": "0001193125-26-071523"
        }
      ]
    },
    {
      "metric_id": "capex",
      "label": "Capital expenditures",
      "concept": "PaymentsToAcquirePropertyPlantAndEquipment",
      "unit": "USD",
      "derived": false,
      "source_concepts": [
        "us-gaap:PaymentsToAcquirePropertyPlantAndEquipment"
      ],
      "points": [
        {
          "fiscal_year": 2022,
          "period_end": "2022-12-31",
          "value": 3223000.0,
          "filed": "2025-02-26",
          "accession": "0000950170-25-027715"
        },
        {
          "fiscal_year": 2023,
          "period_end": "2023-12-31",
          "value": 2884000.0,
          "filed": "2026-02-25",
          "accession": "0001193125-26-071523"
        },
        {
          "fiscal_year": 2024,
          "period_end": "2024-12-31",
          "value": 223000.0,
          "filed": "2026-02-25",
          "accession": "0001193125-26-071523"
        },
        {
          "fiscal_year": 2025,
          "period_end": "2025-12-31",
          "value": 595000.0,
          "filed": "2026-02-25",
          "accession": "0001193125-26-071523"
        }
      ]
    },
    {
      "metric_id": "dividends_paid",
      "label": "Dividends paid",
      "concept": "PaymentsOfDividendsCommonStock",
      "unit": "USD",
      "derived": false,
      "source_concepts": [
        "us-gaap:PaymentsOfDividendsCommonStock"
      ],
      "points": [
        {
          "fiscal_year": 2016,
          "period_end": "2016-12-31",
          "value": 4176000.0,
          "filed": "2019-02-28",
          "accession": "0001521951-19-000019"
        },
        {
          "fiscal_year": 2017,
          "period_end": "2017-12-31",
          "value": 4538000.0,
          "filed": "2019-02-28",
          "accession": "0001521951-19-000019"
        },
        {
          "fiscal_year": 2018,
          "period_end": "2018-12-31",
          "value": 4916000.0,
          "filed": "2020-02-27",
          "accession": "0001521951-20-000014"
        },
        {
          "fiscal_year": 2019,
          "period_end": "2019-12-31",
          "value": 5216000.0,
          "filed": "2021-02-24",
          "accession": "0001521951-21-000028"
        },
        {
          "fiscal_year": 2020,
          "period_end": "2020-12-31",
          "value": 5652000.0,
          "filed": "2023-02-22",
          "accession": "0001521951-23-000028"
        },
        {
          "fiscal_year": 2021,
          "period_end": "2021-12-31",
          "value": 6166000.0,
          "filed": "2024-02-28",
          "accession": "0001521951-24-000020"
        },
        {
          "fiscal_year": 2022,
          "period_end": "2022-12-31",
          "value": 6688000.0,
          "filed": "2025-02-26",
          "accession": "0000950170-25-027715"
        },
        {
          "fiscal_year": 2023,
          "period_end": "2023-12-31",
          "value": 7578000.0,
          "filed": "2026-02-25",
          "accession": "0001193125-26-071523"
        },
        {
          "fiscal_year": 2024,
          "period_end": "2024-12-31",
          "value": 8320000.0,
          "filed": "2026-02-25",
          "accession": "0001193125-26-071523"
        },
        {
          "fiscal_year": 2025,
          "period_end": "2025-12-31",
          "value": 9686000.0,
          "filed": "2026-02-25",
          "accession": "0001193125-26-071523"
        }
      ]
    },
    {
      "metric_id": "share_buybacks",
      "label": "Share buybacks",
      "concept": "PaymentsForRepurchaseOfCommonStock",
      "unit": "USD",
      "derived": false,
      "source_concepts": [
        "us-gaap:PaymentsForRepurchaseOfCommonStock"
      ],
      "points": [
        {
          "fiscal_year": 2016,
          "period_end": "2016-12-31",
          "value": 467000.0,
          "filed": "2019-02-28",
          "accession": "0001521951-19-000019"
        },
        {
          "fiscal_year": 2017,
          "period_end": "2017-12-31",
          "value": 323000.0,
          "filed": "2019-02-28",
          "accession": "0001521951-19-000019"
        },
        {
          "fiscal_year": 2018,
          "period_end": "2018-12-31",
          "value": 533000.0,
          "filed": "2020-02-27",
          "accession": "0001521951-20-000014"
        },
        {
          "fiscal_year": 2019,
          "period_end": "2019-12-31",
          "value": 7248000.0,
          "filed": "2021-02-24",
          "accession": "0001521951-21-000028"
        },
        {
          "fiscal_year": 2020,
          "period_end": "2020-12-31",
          "value": 1672000.0,
          "filed": "2023-02-22",
          "accession": "0001521951-23-000028"
        },
        {
          "fiscal_year": 2021,
          "period_end": "2021-12-31",
          "value": 5478000.0,
          "filed": "2024-02-28",
          "accession": "0001521951-24-000020"
        },
        {
          "fiscal_year": 2022,
          "period_end": "2022-12-31",
          "value": 6126000.0,
          "filed": "2025-02-26",
          "accession": "0000950170-25-027715"
        },
        {
          "fiscal_year": 2023,
          "period_end": "2023-12-31",
          "value": 2971000.0,
          "filed": "2026-02-25",
          "accession": "0001193125-26-071523"
        },
        {
          "fiscal_year": 2024,
          "period_end": "2024-12-31",
          "value": 1270000.0,
          "filed": "2026-02-25",
          "accession": "0001193125-26-071523"
        },
        {
          "fiscal_year": 2025,
          "period_end": "2025-12-31",
          "value": 1390000.0,
          "filed": "2026-02-25",
          "accession": "0001193125-26-071523"
        }
      ]
    },
    {
      "metric_id": "assets",
      "label": "Assets",
      "concept": "Assets",
      "unit": "USD",
      "derived": false,
      "source_concepts": [
        "us-gaap:Assets"
      ],
      "points": [
        {
          "fiscal_year": 2016,
          "period_end": "2016-12-31",
          "value": 1780699000.0,
          "filed": "2018-03-09",
          "accession": "0001521951-18-000021"
        },
        {
          "fiscal_year": 2017,
          "period_end": "2017-12-31",
          "value": 1794066000.0,
          "filed": "2019-02-28",
          "accession": "0001521951-19-000019"
        },
        {
          "fiscal_year": 2018,
          "period_end": "2018-12-31",
          "value": 1966457000.0,
          "filed": "2020-02-27",
          "accession": "0001521951-20-000014"
        },
        {
          "fiscal_year": 2019,
          "period_end": "2019-12-31",
          "value": 2096779000.0,
          "filed": "2021-02-24",
          "accession": "0001521951-21-000028"
        },
        {
          "fiscal_year": 2020,
          "period_end": "2020-12-31",
          "value": 2567837000.0,
          "filed": "2022-02-23",
          "accession": "0001521951-22-000016"
        },
        {
          "fiscal_year": 2021,
          "period_end": "2021-12-31",
          "value": 2652905000.0,
          "filed": "2023-02-22",
          "accession": "0001521951-23-000028"
        },
        {
          "fiscal_year": 2022,
          "period_end": "2022-12-31",
          "value": 2976611000.0,
          "filed": "2025-02-26",
          "accession": "0000950170-25-027715"
        },
        {
          "fiscal_year": 2023,
          "period_end": "2023-12-31",
          "value": 3507846000.0,
          "filed": "2026-02-25",
          "accession": "0001193125-26-071523"
        },
        {
          "fiscal_year": 2024,
          "period_end": "2024-12-31",
          "value": 3853215000.0,
          "filed": "2026-02-25",
          "accession": "0001193125-26-071523"
        },
        {
          "fiscal_year": 2025,
          "period_end": "2025-12-31",
          "value": 4081887000.0,
          "filed": "2026-02-25",
          "accession": "0001193125-26-071523"
        }
      ]
    },
    {
      "metric_id": "liabilities",
      "label": "Liabilities",
      "concept": "Liabilities",
      "unit": "USD",
      "derived": false,
      "source_concepts": [
        "us-gaap:Liabilities"
      ],
      "points": [
        {
          "fiscal_year": 2016,
          "period_end": "2016-12-31",
          "value": 1619049000.0,
          "filed": "2018-03-09",
          "accession": "0001521951-18-000021"
        },
        {
          "fiscal_year": 2017,
          "period_end": "2017-12-31",
          "value": 1624788000.0,
          "filed": "2019-02-28",
          "accession": "0001521951-19-000019"
        },
        {
          "fiscal_year": 2018,
          "period_end": "2018-12-31",
          "value": 1785750000.0,
          "filed": "2020-02-27",
          "accession": "0001521951-20-000014"
        },
        {
          "fiscal_year": 2019,
          "period_end": "2019-12-31",
          "value": 1902623000.0,
          "filed": "2021-02-24",
          "accession": "0001521951-21-000028"
        },
        {
          "fiscal_year": 2020,
          "period_end": "2020-12-31",
          "value": 2361675000.0,
          "filed": "2022-02-23",
          "accession": "0001521951-22-000016"
        },
        {
          "fiscal_year": 2021,
          "period_end": "2021-12-31",
          "value": 2420483000.0,
          "filed": "2023-02-22",
          "accession": "0001521951-23-000028"
        },
        {
          "fiscal_year": 2022,
          "period_end": "2022-12-31",
          "value": 2715971000.0,
          "filed": "2024-02-28",
          "accession": "0001521951-24-000020"
        },
        {
          "fiscal_year": 2023,
          "period_end": "2023-12-31",
          "value": 3218258000.0,
          "filed": "2025-02-26",
          "accession": "0000950170-25-027715"
        },
        {
          "fiscal_year": 2024,
          "period_end": "2024-12-31",
          "value": 3524626000.0,
          "filed": "2026-02-25",
          "accession": "0001193125-26-071523"
        },
        {
          "fiscal_year": 2025,
          "period_end": "2025-12-31",
          "value": 3710302000.0,
          "filed": "2026-02-25",
          "accession": "0001193125-26-071523"
        }
      ]
    },
    {
      "metric_id": "equity",
      "label": "Stockholders' equity",
      "concept": "StockholdersEquity",
      "unit": "USD",
      "derived": false,
      "source_concepts": [
        "us-gaap:StockholdersEquity"
      ],
      "points": [
        {
          "fiscal_year": 2016,
          "period_end": "2016-12-31",
          "value": 161650000.0,
          "filed": "2019-02-28",
          "accession": "0001521951-19-000019"
        },
        {
          "fiscal_year": 2017,
          "period_end": "2017-12-31",
          "value": 169278000.0,
          "filed": "2020-02-27",
          "accession": "0001521951-20-000014"
        },
        {
          "fiscal_year": 2018,
          "period_end": "2018-12-31",
          "value": 180707000.0,
          "filed": "2021-02-24",
          "accession": "0001521951-21-000028"
        },
        {
          "fiscal_year": 2019,
          "period_end": "2019-12-31",
          "value": 194156000.0,
          "filed": "2023-02-22",
          "accession": "0001521951-23-000028"
        },
        {
          "fiscal_year": 2020,
          "period_end": "2020-12-31",
          "value": 206162000.0,
          "filed": "2024-02-28",
          "accession": "0001521951-24-000020"
        },
        {
          "fiscal_year": 2021,
          "period_end": "2021-12-31",
          "value": 232422000.0,
          "filed": "2025-02-26",
          "accession": "0000950170-25-027715"
        },
        {
          "fiscal_year": 2022,
          "period_end": "2022-12-31",
          "value": 260640000.0,
          "filed": "2026-02-25",
          "accession": "0001193125-26-071523"
        },
        {
          "fiscal_year": 2023,
          "period_end": "2023-12-31",
          "value": 289588000.0,
          "filed": "2026-02-25",
          "accession": "0001193125-26-071523"
        },
        {
          "fiscal_year": 2024,
          "period_end": "2024-12-31",
          "value": 328589000.0,
          "filed": "2026-02-25",
          "accession": "0001193125-26-071523"
        },
        {
          "fiscal_year": 2025,
          "period_end": "2025-12-31",
          "value": 371585000.0,
          "filed": "2026-02-25",
          "accession": "0001193125-26-071523"
        }
      ]
    },
    {
      "metric_id": "cash",
      "label": "Cash and cash equivalents",
      "concept": "CashAndCashEquivalentsAtCarryingValue",
      "unit": "USD",
      "derived": false,
      "source_concepts": [
        "us-gaap:CashAndCashEquivalentsAtCarryingValue"
      ],
      "points": [
        {
          "fiscal_year": 2016,
          "period_end": "2016-12-31",
          "value": 77517000.0,
          "filed": "2019-02-28",
          "accession": "0001521951-19-000019"
        },
        {
          "fiscal_year": 2017,
          "period_end": "2017-12-31",
          "value": 52539000.0,
          "filed": "2020-02-27",
          "accession": "0001521951-20-000014"
        },
        {
          "fiscal_year": 2018,
          "period_end": "2018-12-31",
          "value": 86546000.0,
          "filed": "2021-02-24",
          "accession": "0001521951-21-000028"
        },
        {
          "fiscal_year": 2019,
          "period_end": "2019-12-31",
          "value": 67102000.0,
          "filed": "2022-02-23",
          "accession": "0001521951-22-000016"
        },
        {
          "fiscal_year": 2020,
          "period_end": "2020-12-31",
          "value": 56909000.0,
          "filed": "2022-02-23",
          "accession": "0001521951-22-000016"
        },
        {
          "fiscal_year": 2021,
          "period_end": "2021-12-31",
          "value": 57110000.0,
          "filed": "2023-02-22",
          "accession": "0001521951-23-000028"
        },
        {
          "fiscal_year": 2022,
          "period_end": "2022-12-31",
          "value": 102682000.0,
          "filed": "2024-02-28",
          "accession": "0001521951-24-000020"
        },
        {
          "fiscal_year": 2023,
          "period_end": "2023-12-31",
          "value": 139510000.0,
          "filed": "2025-02-26",
          "accession": "0000950170-25-027715"
        },
        {
          "fiscal_year": 2024,
          "period_end": "2024-12-31",
          "value": 157702000.0,
          "filed": "2026-02-25",
          "accession": "0001193125-26-071523"
        },
        {
          "fiscal_year": 2025,
          "period_end": "2025-12-31",
          "value": 39485000.0,
          "filed": "2026-02-25",
          "accession": "0001193125-26-071523"
        }
      ]
    },
    {
      "metric_id": "free_cash_flow",
      "label": "Free cash flow",
      "concept": "NetCashProvidedByUsedInOperatingActivities - PaymentsToAcquirePropertyPlantAndEquipment",
      "unit": "USD",
      "derived": true,
      "source_concepts": [
        "us-gaap:NetCashProvidedByUsedInOperatingActivities",
        "us-gaap:PaymentsToAcquirePropertyPlantAndEquipment"
      ],
      "points": [
        {
          "fiscal_year": 2022,
          "period_end": "2022-12-31",
          "value": 35422000.0,
          "filed": "2025-02-26",
          "accession": "0000950170-25-027715"
        },
        {
          "fiscal_year": 2023,
          "period_end": "2023-12-31",
          "value": 49408000.0,
          "filed": "2026-02-25",
          "accession": "0001193125-26-071523"
        },
        {
          "fiscal_year": 2024,
          "period_end": "2024-12-31",
          "value": 57268000.0,
          "filed": "2026-02-25",
          "accession": "0001193125-26-071523"
        },
        {
          "fiscal_year": 2025,
          "period_end": "2025-12-31",
          "value": 61101000.0,
          "filed": "2026-02-25",
          "accession": "0001193125-26-071523"
        }
      ]
    },
    {
      "metric_id": "net_margin",
      "label": "Net margin",
      "concept": "NetIncomeLoss / InterestAndDividendIncomeOperating",
      "unit": "Percent",
      "derived": true,
      "source_concepts": [
        "us-gaap:NetIncomeLoss",
        "us-gaap:InterestAndDividendIncomeOperating"
      ],
      "points": [
        {
          "fiscal_year": 2016,
          "period_end": "2016-12-31",
          "value": 19.0854743525737,
          "filed": "2019-02-28",
          "accession": "0001521951-19-000019"
        },
        {
          "fiscal_year": 2017,
          "period_end": "2017-12-31",
          "value": 15.70352587355397,
          "filed": "2019-02-28",
          "accession": "0001521951-19-000019"
        },
        {
          "fiscal_year": 2018,
          "period_end": "2018-12-31",
          "value": 17.861407833470285,
          "filed": "2020-02-27",
          "accession": "0001521951-20-000014"
        },
        {
          "fiscal_year": 2019,
          "period_end": "2019-12-31",
          "value": 22.85770286162289,
          "filed": "2021-02-24",
          "accession": "0001521951-21-000028"
        },
        {
          "fiscal_year": 2020,
          "period_end": "2020-12-31",
          "value": 18.02737340596099,
          "filed": "2023-02-22",
          "accession": "0001521951-23-000028"
        },
        {
          "fiscal_year": 2021,
          "period_end": "2021-12-31",
          "value": 37.2467316006042,
          "filed": "2024-02-28",
          "accession": "0001521951-24-000020"
        },
        {
          "fiscal_year": 2022,
          "period_end": "2022-12-31",
          "value": 33.66372527209959,
          "filed": "2025-02-26",
          "accession": "0000950170-25-027715"
        },
        {
          "fiscal_year": 2023,
          "period_end": "2023-12-31",
          "value": 18.99521874743495,
          "filed": "2026-02-25",
          "accession": "0001193125-26-071523"
        },
        {
          "fiscal_year": 2024,
          "period_end": "2024-12-31",
          "value": 18.978681422382362,
          "filed": "2026-02-25",
          "accession": "0001193125-26-071523"
        },
        {
          "fiscal_year": 2025,
          "period_end": "2025-12-31",
          "value": 20.346528648255227,
          "filed": "2026-02-25",
          "accession": "0001193125-26-071523"
        }
      ]
    },
    {
      "metric_id": "roe",
      "label": "Return on equity",
      "concept": "NetIncomeLoss / StockholdersEquity",
      "unit": "Percent",
      "derived": true,
      "source_concepts": [
        "us-gaap:NetIncomeLoss",
        "us-gaap:StockholdersEquity"
      ],
      "points": [
        {
          "fiscal_year": 2016,
          "period_end": "2016-12-31",
          "value": 9.223012681719766,
          "filed": "2019-02-28",
          "accession": "0001521951-19-000019"
        },
        {
          "fiscal_year": 2017,
          "period_end": "2017-12-31",
          "value": 7.0328099339547965,
          "filed": "2020-02-27",
          "accession": "0001521951-19-000019"
        },
        {
          "fiscal_year": 2018,
          "period_end": "2018-12-31",
          "value": 9.021786649106012,
          "filed": "2021-02-24",
          "accession": "0001521951-20-000014"
        },
        {
          "fiscal_year": 2019,
          "period_end": "2019-12-31",
          "value": 12.013020457776221,
          "filed": "2023-02-22",
          "accession": "0001521951-21-000028"
        },
        {
          "fiscal_year": 2020,
          "period_end": "2020-12-31",
          "value": 8.235271291508619,
          "filed": "2024-02-28",
          "accession": "0001521951-23-000028"
        },
        {
          "fiscal_year": 2021,
          "period_end": "2021-12-31",
          "value": 15.383655591983548,
          "filed": "2025-02-26",
          "accession": "0001521951-24-000020"
        },
        {
          "fiscal_year": 2022,
          "period_end": "2022-12-31",
          "value": 15.676028238182935,
          "filed": "2026-02-25",
          "accession": "0000950170-25-027715"
        },
        {
          "fiscal_year": 2023,
          "period_end": "2023-12-31",
          "value": 12.786096108954792,
          "filed": "2026-02-25",
          "accession": "0001193125-26-071523"
        },
        {
          "fiscal_year": 2024,
          "period_end": "2024-12-31",
          "value": 13.465149472441256,
          "filed": "2026-02-25",
          "accession": "0001193125-26-071523"
        },
        {
          "fiscal_year": 2025,
          "period_end": "2025-12-31",
          "value": 13.541719929491233,
          "filed": "2026-02-25",
          "accession": "0001193125-26-071523"
        }
      ]
    },
    {
      "metric_id": "roa",
      "label": "Return on assets",
      "concept": "NetIncomeLoss / Assets",
      "unit": "Percent",
      "derived": true,
      "source_concepts": [
        "us-gaap:NetIncomeLoss",
        "us-gaap:Assets"
      ],
      "points": [
        {
          "fiscal_year": 2016,
          "period_end": "2016-12-31",
          "value": 0.8372554822572484,
          "filed": "2019-02-28",
          "accession": "0001521951-19-000019"
        },
        {
          "fiscal_year": 2017,
          "period_end": "2017-12-31",
          "value": 0.6635764793491432,
          "filed": "2019-02-28",
          "accession": "0001521951-19-000019"
        },
        {
          "fiscal_year": 2018,
          "period_end": "2018-12-31",
          "value": 0.8290544873343276,
          "filed": "2020-02-27",
          "accession": "0001521951-20-000014"
        },
        {
          "fiscal_year": 2019,
          "period_end": "2019-12-31",
          "value": 1.112372834714579,
          "filed": "2021-02-24",
          "accession": "0001521951-21-000028"
        },
        {
          "fiscal_year": 2020,
          "period_end": "2020-12-31",
          "value": 0.6611790390122114,
          "filed": "2023-02-22",
          "accession": "0001521951-23-000028"
        },
        {
          "fiscal_year": 2021,
          "period_end": "2021-12-31",
          "value": 1.3477678243284248,
          "filed": "2024-02-28",
          "accession": "0001521951-24-000020"
        },
        {
          "fiscal_year": 2022,
          "period_end": "2022-12-31",
          "value": 1.3726348521859255,
          "filed": "2025-02-26",
          "accession": "0000950170-25-027715"
        },
        {
          "fiscal_year": 2023,
          "period_end": "2023-12-31",
          "value": 1.0555480485745383,
          "filed": "2026-02-25",
          "accession": "0001193125-26-071523"
        },
        {
          "fiscal_year": 2024,
          "period_end": "2024-12-31",
          "value": 1.1482619059668355,
          "filed": "2026-02-25",
          "accession": "0001193125-26-071523"
        },
        {
          "fiscal_year": 2025,
          "period_end": "2025-12-31",
          "value": 1.232738681889038,
          "filed": "2026-02-25",
          "accession": "0001193125-26-071523"
        }
      ]
    },
    {
      "metric_id": "liabilities_to_equity",
      "label": "Liabilities / equity",
      "concept": "Liabilities / StockholdersEquity",
      "unit": "Ratio",
      "derived": true,
      "source_concepts": [
        "us-gaap:Liabilities",
        "us-gaap:StockholdersEquity"
      ],
      "points": [
        {
          "fiscal_year": 2016,
          "period_end": "2016-12-31",
          "value": 10.01576863594185,
          "filed": "2019-02-28",
          "accession": "0001521951-18-000021"
        },
        {
          "fiscal_year": 2017,
          "period_end": "2017-12-31",
          "value": 9.598341190231453,
          "filed": "2020-02-27",
          "accession": "0001521951-19-000019"
        },
        {
          "fiscal_year": 2018,
          "period_end": "2018-12-31",
          "value": 9.882018958867116,
          "filed": "2021-02-24",
          "accession": "0001521951-20-000014"
        },
        {
          "fiscal_year": 2019,
          "period_end": "2019-12-31",
          "value": 9.799455077360474,
          "filed": "2023-02-22",
          "accession": "0001521951-21-000028"
        },
        {
          "fiscal_year": 2020,
          "period_end": "2020-12-31",
          "value": 11.455433106004016,
          "filed": "2024-02-28",
          "accession": "0001521951-22-000016"
        },
        {
          "fiscal_year": 2021,
          "period_end": "2021-12-31",
          "value": 10.414173357083236,
          "filed": "2025-02-26",
          "accession": "0001521951-23-000028"
        },
        {
          "fiscal_year": 2022,
          "period_end": "2022-12-31",
          "value": 10.420392111724984,
          "filed": "2026-02-25",
          "accession": "0001521951-24-000020"
        },
        {
          "fiscal_year": 2023,
          "period_end": "2023-12-31",
          "value": 11.11322982996533,
          "filed": "2026-02-25",
          "accession": "0000950170-25-027715"
        },
        {
          "fiscal_year": 2024,
          "period_end": "2024-12-31",
          "value": 10.726548971511523,
          "filed": "2026-02-25",
          "accession": "0001193125-26-071523"
        },
        {
          "fiscal_year": 2025,
          "period_end": "2025-12-31",
          "value": 9.985069365017425,
          "filed": "2026-02-25",
          "accession": "0001193125-26-071523"
        }
      ]
    }
  ],
  "quarterly": [
    {
      "metric_id": "revenue",
      "label": "Revenue",
      "concept": "InterestAndDividendIncomeOperating",
      "unit": "USD",
      "source_concepts": [
        "us-gaap:InterestAndDividendIncomeOperating"
      ],
      "points": [
        {
          "fiscal_year": 2023,
          "fiscal_quarter": 1,
          "period_label": "2023-Q1",
          "period_end": "2023-03-31",
          "value": 42064000.0,
          "filed": "2023-04-28",
          "accession": "0001521951-23-000042",
          "derived": false
        },
        {
          "fiscal_year": 2023,
          "fiscal_quarter": 2,
          "period_label": "2023-Q2",
          "period_end": "2023-06-30",
          "value": 47161000.0,
          "filed": "2023-07-28",
          "accession": "0001521951-23-000065",
          "derived": false
        },
        {
          "fiscal_year": 2023,
          "fiscal_quarter": 3,
          "period_label": "2023-Q3",
          "period_end": "2023-09-30",
          "value": 50941000.0,
          "filed": "2023-10-27",
          "accession": "0001521951-23-000083",
          "derived": false
        },
        {
          "fiscal_year": 2024,
          "fiscal_quarter": 1,
          "period_label": "2024-Q1",
          "period_end": "2024-03-31",
          "value": 55783000.0,
          "filed": "2024-04-26",
          "accession": "0001521951-24-000033",
          "derived": false
        },
        {
          "fiscal_year": 2024,
          "fiscal_quarter": 2,
          "period_label": "2024-Q2",
          "period_end": "2024-06-30",
          "value": 57910000.0,
          "filed": "2024-07-26",
          "accession": "0000950170-24-086931",
          "derived": false
        },
        {
          "fiscal_year": 2024,
          "fiscal_quarter": 3,
          "period_label": "2024-Q3",
          "period_end": "2024-09-30",
          "value": 59327000.0,
          "filed": "2024-10-25",
          "accession": "0000950170-24-117408",
          "derived": false
        },
        {
          "fiscal_year": 2024,
          "fiscal_quarter": 4,
          "period_label": "2024-Q4",
          "period_end": "2024-12-31",
          "value": 60110000.0,
          "filed": "2025-02-26",
          "accession": "0000950170-25-027715",
          "derived": true
        },
        {
          "fiscal_year": 2025,
          "fiscal_quarter": 1,
          "period_label": "2025-Q1",
          "period_end": "2025-03-31",
          "value": 59530000.0,
          "filed": "2025-04-25",
          "accession": "0000950170-25-058735",
          "derived": false
        },
        {
          "fiscal_year": 2025,
          "fiscal_quarter": 2,
          "period_label": "2025-Q2",
          "period_end": "2025-06-30",
          "value": 61282000.0,
          "filed": "2025-07-25",
          "accession": "0000950170-25-098776",
          "derived": false
        },
        {
          "fiscal_year": 2025,
          "fiscal_quarter": 3,
          "period_label": "2025-Q3",
          "period_end": "2025-09-30",
          "value": 63746000.0,
          "filed": "2025-10-31",
          "accession": "0001193125-25-260778",
          "derived": false
        },
        {
          "fiscal_year": 2025,
          "fiscal_quarter": 4,
          "period_label": "2025-Q4",
          "period_end": "2025-12-31",
          "value": 62752000.0,
          "filed": "2026-02-25",
          "accession": "0001193125-26-071523",
          "derived": true
        },
        {
          "fiscal_year": 2026,
          "fiscal_quarter": 1,
          "period_label": "2026-Q1",
          "period_end": "2026-03-31",
          "value": 61896000.0,
          "filed": "2026-04-24",
          "accession": "0001193125-26-177139",
          "derived": false
        }
      ]
    },
    {
      "metric_id": "net_income",
      "label": "Net income",
      "concept": "NetIncomeLoss",
      "unit": "USD",
      "source_concepts": [
        "us-gaap:NetIncomeLoss"
      ],
      "points": [
        {
          "fiscal_year": 2023,
          "fiscal_quarter": 1,
          "period_label": "2023-Q1",
          "period_end": "2023-03-31",
          "value": 8979000.0,
          "filed": "2023-04-28",
          "accession": "0001521951-23-000042",
          "derived": false
        },
        {
          "fiscal_year": 2023,
          "fiscal_quarter": 2,
          "period_label": "2023-Q2",
          "period_end": "2023-03-31",
          "value": 8979000.0,
          "filed": "2023-07-28",
          "accession": "0001521951-23-000065",
          "derived": false
        },
        {
          "fiscal_year": 2023,
          "fiscal_quarter": 3,
          "period_label": "2023-Q3",
          "period_end": "2023-06-30",
          "value": 8337000.0,
          "filed": "2023-10-27",
          "accession": "0001521951-23-000083",
          "derived": false
        },
        {
          "fiscal_year": 2024,
          "fiscal_quarter": 1,
          "period_label": "2024-Q1",
          "period_end": "2024-03-31",
          "value": 8848000.0,
          "filed": "2024-04-26",
          "accession": "0001521951-24-000033",
          "derived": false
        },
        {
          "fiscal_year": 2024,
          "fiscal_quarter": 2,
          "period_label": "2024-Q2",
          "period_end": "2024-03-31",
          "value": 8848000.0,
          "filed": "2024-07-26",
          "accession": "0000950170-24-086931",
          "derived": false
        },
        {
          "fiscal_year": 2024,
          "fiscal_quarter": 3,
          "period_label": "2024-Q3",
          "period_end": "2024-06-30",
          "value": 10456000.0,
          "filed": "2024-10-25",
          "accession": "0000950170-24-117408",
          "derived": false
        },
        {
          "fiscal_year": 2024,
          "fiscal_quarter": 4,
          "period_label": "2024-Q4",
          "period_end": "2024-12-31",
          "value": 14415000.0,
          "filed": "2025-02-26",
          "accession": "0000950170-25-027715",
          "derived": true
        },
        {
          "fiscal_year": 2025,
          "fiscal_quarter": 1,
          "period_label": "2025-Q1",
          "period_end": "2025-03-31",
          "value": 11171000.0,
          "filed": "2025-04-25",
          "accession": "0000950170-25-058735",
          "derived": false
        },
        {
          "fiscal_year": 2025,
          "fiscal_quarter": 2,
          "period_label": "2025-Q2",
          "period_end": "2025-03-31",
          "value": 11171000.0,
          "filed": "2025-07-25",
          "accession": "0000950170-25-098776",
          "derived": false
        },
        {
          "fiscal_year": 2025,
          "fiscal_quarter": 3,
          "period_label": "2025-Q3",
          "period_end": "2025-06-30",
          "value": 11422000.0,
          "filed": "2025-10-31",
          "accession": "0001193125-25-260778",
          "derived": false
        },
        {
          "fiscal_year": 2025,
          "fiscal_quarter": 4,
          "period_label": "2025-Q4",
          "period_end": "2025-12-31",
          "value": 13333000.0,
          "filed": "2026-02-25",
          "accession": "0001193125-26-071523",
          "derived": true
        },
        {
          "fiscal_year": 2026,
          "fiscal_quarter": 1,
          "period_label": "2026-Q1",
          "period_end": "2026-03-31",
          "value": 12200000.0,
          "filed": "2026-04-24",
          "accession": "0001193125-26-177139",
          "derived": false
        }
      ]
    },
    {
      "metric_id": "eps_diluted",
      "label": "Diluted EPS",
      "concept": "EarningsPerShareDiluted",
      "unit": "USD/shares",
      "source_concepts": [
        "us-gaap:EarningsPerShareDiluted"
      ],
      "points": [
        {
          "fiscal_year": 2022,
          "fiscal_quarter": 2,
          "period_label": "2022-Q2",
          "period_end": "2022-06-30",
          "value": 1.29,
          "filed": "2022-07-29",
          "accession": "0001521951-22-000051",
          "derived": false
        },
        {
          "fiscal_year": 2022,
          "fiscal_quarter": 3,
          "period_label": "2022-Q3",
          "period_end": "2022-09-30",
          "value": 1.25,
          "filed": "2022-10-28",
          "accession": "0001521951-22-000071",
          "derived": false
        },
        {
          "fiscal_year": 2023,
          "fiscal_quarter": 1,
          "period_label": "2023-Q1",
          "period_end": "2023-03-31",
          "value": 1.05,
          "filed": "2023-04-28",
          "accession": "0001521951-23-000042",
          "derived": false
        },
        {
          "fiscal_year": 2023,
          "fiscal_quarter": 2,
          "period_label": "2023-Q2",
          "period_end": "2023-06-30",
          "value": 0.98,
          "filed": "2023-07-28",
          "accession": "0001521951-23-000065",
          "derived": false
        },
        {
          "fiscal_year": 2023,
          "fiscal_quarter": 3,
          "period_label": "2023-Q3",
          "period_end": "2023-09-30",
          "value": 1.17,
          "filed": "2023-10-27",
          "accession": "0001521951-23-000083",
          "derived": false
        },
        {
          "fiscal_year": 2024,
          "fiscal_quarter": 1,
          "period_label": "2024-Q1",
          "period_end": "2024-03-31",
          "value": 1.04,
          "filed": "2024-04-26",
          "accession": "0001521951-24-000033",
          "derived": false
        },
        {
          "fiscal_year": 2024,
          "fiscal_quarter": 2,
          "period_label": "2024-Q2",
          "period_end": "2024-06-30",
          "value": 1.23,
          "filed": "2024-07-26",
          "accession": "0000950170-24-086931",
          "derived": false
        },
        {
          "fiscal_year": 2024,
          "fiscal_quarter": 3,
          "period_label": "2024-Q3",
          "period_end": "2024-09-30",
          "value": 1.24,
          "filed": "2024-10-25",
          "accession": "0000950170-24-117408",
          "derived": false
        },
        {
          "fiscal_year": 2025,
          "fiscal_quarter": 1,
          "period_label": "2025-Q1",
          "period_end": "2025-03-31",
          "value": 1.32,
          "filed": "2025-04-25",
          "accession": "0000950170-25-058735",
          "derived": false
        },
        {
          "fiscal_year": 2025,
          "fiscal_quarter": 2,
          "period_label": "2025-Q2",
          "period_end": "2025-06-30",
          "value": 1.35,
          "filed": "2025-07-25",
          "accession": "0000950170-25-098776",
          "derived": false
        },
        {
          "fiscal_year": 2025,
          "fiscal_quarter": 3,
          "period_label": "2025-Q3",
          "period_end": "2025-09-30",
          "value": 1.7,
          "filed": "2025-10-31",
          "accession": "0001193125-25-260778",
          "derived": false
        },
        {
          "fiscal_year": 2026,
          "fiscal_quarter": 1,
          "period_label": "2026-Q1",
          "period_end": "2026-03-31",
          "value": 1.44,
          "filed": "2026-04-24",
          "accession": "0001193125-26-177139",
          "derived": false
        }
      ]
    }
  ]
}