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Income Taxes - Reconciliation of Effective Tax Rate and Statutory Federal Income Tax Rate (Detail) | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Income Tax Disclosure [Abstract] |  |  |
Federal statutory income tax rate | 21.00% | 21.00% | 21.00%
State income taxes, net of federal tax benefit | 7.90% | 7.90% | 7.70%
Tax-exempt interest on municipal obligations | (0.70%) | (0.50%) | (0.90%)
Tax-exempt life insurance related income | (0.40%) | (0.50%) | (0.80%)
Low income housing tax credits | (3.70%) | (2.60%) | (4.80%)
Low income housing tax credit amortization | 3.60% | 2.20% | 4.10%
Equity compensation | (0.20%) | (0.10%) | 0.40%
Non-deductible merger expenses | 0.10% | 0.10% | 0.00%
Other | 0.30% | 0.60% | (0.90%)
Effective Tax Rate | 27.90% | 28.10% | 25.80%

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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 https://asc.fasb.org/extlink&oid=121826272&loc=d3e32687-109319 + Details
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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 6.I.Fact.4) -URI https://asc.fasb.org/extlink&oid=122134291&loc=d3e330036-122817 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)(2)) -URI https://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32687-109319 + Details
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