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Income Taxes - Reconciliation from Federal Statutory Income Tax Rate to Effective Tax Rate (Detail)
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Income Tax Disclosure [Abstract]      
Federal statutory tax rate 21.00% 21.00% 21.00%
Net tax-exempt interest income on securities and loans of state and political subdivisions (2.60%) (1.80%) (4.20%)
State income taxes, net of federal tax effect 3.10% 2.30% 1.90%
Bank-owned life insurance (1.00%) (0.60%) (1.10%)
General business credits (3.00%) (1.90%) (3.70%)
All other—net 1.20% 0.70% 2.00%
Effective tax rate 18.70% 19.70% 15.90%