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Income Taxes - Reconciliation between Federal Statutory Income Tax Rate and Effective Tax Rate (Detail) | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Income Tax Disclosure [Abstract] |  |  |
Federal statutory income tax rate | 21.00% | 21.00% | 21.00%
State taxes, net of federal tax benefits | 8.77% | 9.06% | 7.33%
Tax credit - federal | (1.76%) | (1.52%) | (1.30%)
Low-income housing amortization | 2.05% | 1.64% | 1.34%
Other | (0.26%) | (0.03%) | (0.42%)
Effective tax rate | 29.80% | 30.15% | 27.95%

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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 -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-12 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 231 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482663/740-10-55-231 + Details
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