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Qualified Affordable Housing Project and Historic Tax Investments (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Equity Method Investments and Joint Ventures [Abstract] |  |  |
Investments in qualified affordable housing projects | $ 23.2 | $ 18.0 |
Investment, proportional amortization method, elected statement of financial position [extensible enumeration] | Other assets | Other assets |
Investments in qualified affordable housing projects, unfunded commitments | $ 7.6 | $ 0.7 |
Investment Program, Proportional Amortization Method, Elected, Income Tax Credit and Other Income Tax Benefit, before Amortization Expense | 5.4 | 5.6 | $ 6.1
Amortization expense that qualified for proportional amortization method | $ 2.9 | $ 3.1 | $ 3.6
Investment program, proportional amortization method, elected, income tax credit and other income tax benefit, before amortization, statement of income or comprehensive income [Extensible Enumeration] | Income tax expense | Income tax expense | Income tax expense
Investment program, proportional amortization method, applied, amortization expense, statement of income or comprehensive income [extensible enumeration] |  |  | Income tax expense
Investment Program, Proportional Amortization Method, Elected, Income Tax Credit and Other Income Tax Benefit, after Amortization, Statement of Cash Flows [Extensible Enumeration] |  |  | income tax expense
Investment Program Proportional Amortization Method Elected Income Tax Credit And Other Income Tax Benefit Before Amortization Statement Of Cash Flows Extensible Enumeration Not Disclosed Flag | Consolidated Statements of Income | Consolidated Statements of Income | Consolidated Statements of Income
Investment Program Proportional Amortization Method Applied Income Tax Credit And Other Tax Benefit Amortization Statement Of Cash Flows Extensible Enumeration Not Disclosed Flag | Consolidated Statements of Income | Consolidated Statements of Income | Consolidated Statements of Income
Investment program, proportional amortization method, elected, income tax credit and other income tax benefit, after amortization, statement of income or comprehensive income [Extensible Enumeration] | Net Income (Loss) | Net Income (Loss) | Net Income (Loss)
Investments in qualified affordable housing projects, amortization expense | $ 2.5 | $ 2.5 | $ 2.5
Investment program, proportional amortization method, applied, non-income-tax-related activity and other return, statement of income or comprehensive income [Extensible Enumeration] | Other operating | Other operating | Other operating

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- Definition Amount of commitment and contingent commitment, including amount of delayed equity contribution, for investment that generates income tax credit and other income tax benefit under tax credit program elected to be accounted for using proportional amortization method. Includes, but is not limited to, commitment and contingent commitment related to investment under tax credit program not meeting condition for accounting under proportional amortization method. + References Reference 1: http://www.xbrl.org/2003/role/recommendedDisclosureRef -Topic 740 -SubTopic 323 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478156/740-323-50-2 + Details
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