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Qualified Affordable Housing Project Investments - Additional Information (Detail) - USD ($) | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Investments in Affordable Housing Projects [Line Items] |  |  |
Qualified affordable housing project investments | $ 16,600,000 | $ 5,900,000 |
Unfunded commitments related to investments | $ 10,000,000 | 27,000 |
Investment commitments expected to be paid | 2024 2025 2026 2027 2028 |  |
Income Tax Expense |  |  |
Investments in Affordable Housing Projects [Line Items] |  |  |
Qualified affordable housing project investments, amortization expense recognized | $ 1,900,000 | $ 1,900,000 | $ 1,900,000

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- Definition Year in which contingent commitments to qualified affordable housing project investments are expected to be paid, in YYYY format. + References Reference 1: http://www.xbrl.org/2003/role/recommendedDisclosureRef -Topic 323 -SubTopic 740 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481543/323-740-50-2 + Details
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- Definition Amount of investment in qualified affordable housing projects. + References Reference 1: http://www.xbrl.org/2003/role/recommendedDisclosureRef -Topic 323 -SubTopic 740 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481543/323-740-50-2 + Details
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