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Qualified Affordable Housing Project Investments - Additional Information (Detail) - USD ($) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Investments in Affordable Housing Projects [Line Items] |  |
Qualified affordable housing project investments | $ 7,800,000 | $ 9,600,000
Unfunded commitments related to investments | $ 84,000 | 112,000
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 | $ 1,800,000 | $ 2,000,000.0

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