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Income Taxes - Reconciliation of Effective Tax Rate and Statutory Federal Income Tax Rate (Detail)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Federal statutory income tax rate	21.00%	21.00%	21.00%
State income taxes, net of federal tax benefit	7.70%	7.90%	8.60%
Tax-exempt interest on municipal obligations	(0.90%)	(0.70%)	(1.00%)
Tax-exempt life insurance related income	(0.80%)	(0.60%)	(0.60%)
Low income housing tax credits	(4.80%)	(2.30%)	(2.20%)
Low income housing tax credit amortization	4.10%	2.10%	2.00%
Equity compensation	0.40%	(0.40%)	(0.40%)
Non-deductible merger expenses	0.00%	0.00%	0.20%
Other	(0.90%)	0.40%	(0.80%)
Effective Tax Rate	25.80%	27.40%	26.80%

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to nondeductible expense for share-based payment arrangement.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits.

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