Income Taxes - Income Tax Provision Differences from Expected Statutory Provision (Detail)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Expected provision at statutory rate	21.00%	21.00%	21.00%
Difference resulting from:
Tax exempt interest income, net of disallowance	(1.70%)	(1.60%)	(3.80%)
Increase in value of bank owned life insurance assets	(0.80%)	(0.70%)	(1.10%)
Stock-based compensation	(0.20%)	(0.20%)	0.20%
State income taxes, net of federal benefits	1.10%	1.00%	1.10%
Changes in valuation allowance	0.70%	0.20%	0.20%
Federal benefit of state deferred tax asset revaluation	(0.80%)	0.00%	0.00%
Other	0.30%	0.00%	(0.10%)
Provision for income taxes - effective income tax rate	19.60%	19.70%	17.50%