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Qualified Affordable Housing Project Investments - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Investments in Affordable Housing Projects [Line Items] |  |  |
Unfunded commitments related to investments | $ 13.8 | $ 10.0 |
Investment, Proportional Amortization Method, Elected, Statement of Financial Position [Extensible Enumeration] | Prepaid Expense and Other Assets | Prepaid Expense and Other Assets |
Qualified affordable housing project investments | $ 22.1 | $ 16.6 |
Investment commitments expected to be paid | 2025 2026 2027 2028 2029 |  |
Investment Program, Proportional Amortization Method, Applied, Amortization Expense, Statement of Income or Comprehensive Income [Extensible Enumeration] | Income Tax Expense (Benefit) | Income Tax Expense (Benefit) |
Investment Program, Proportional Amortization Method, Applied, Amortization Expense, Statement of Cash Flows [Extensible Enumeration] |  |  | Income Tax Expense (Benefit)
Qualified affordable housing project investments, amortization expense recognized | $ 1.8 | $ 1.9 | $ 1.9

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- Definition Year in which contingent commitment 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, is expected to be paid, in YYYY format. Includes, but is not limited to, 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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- Definition Amount of 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, investment under program not meeting condition for accounting under proportional amortization method. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 740 -SubTopic 323 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478156/740-323-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 323 -Name Accounting Standards Codification -Section 50 -Paragraph 1A -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478156/740-323-50-1A + Details
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