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Income Taxes - Reconciliation between Federal Statutory Income Tax Rate and Effective Tax Rates (Detail) | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Income Tax Disclosure [Abstract] |  |  |
Federal statutory income tax rate | 21.00% | 21.00% | 21.00%
State taxes, net of federal tax benefits | 5.81% | 7.86% | 9.39%
Tax credit - federal | (1.16%) | (2.68%) | (3.49%)
Low-income housing amortization | 1.37% | 3.02% | 4.17%
Other | 0.16% | (0.12%) | (0.32%)
Effective tax rate | 27.18% | 29.08% | 30.75%

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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32687-109319 + Details
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