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Qualified Affordable Housing Project Investments - Additional Information (Detail) - USD ($) | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Investments in Affordable Housing Projects [Line Items] |  |
Qualified affordable housing project investments | $ 8,000,000.0 | $ 7,800,000
Unfunded commitments related to investments | $ 56,000 | 84,000
Investment commitments expected to be paid | 2023 |
Income Tax Expense |  |
Investments in Affordable Housing Projects [Line Items] |  |
Qualified affordable housing project investments, amortization expense recognized | $ 1,900,000 | $ 1,800,000

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- Definition Amount of investment in qualified affordable housing projects. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 740 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=116633289&loc=SL49122993-202985 + Details
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