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Income Taxes - Reconciliation of Effective Tax Rate and Statutory Federal Income Tax Rate (Detail)
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Effective Income Tax Rate Reconciliation, Percent [Abstract]      
Federal statutory income tax rate 21.00% 21.00% 21.00%
State income taxes, net of federal tax benefit 7.90% 7.90% 7.90%
Tax-exempt interest on municipal obligations (0.50%) (0.70%) (0.70%)
Tax-exempt life insurance related income (0.40%) (0.40%) (0.40%)
Low income housing tax credits (7.90%) (6.60%) (3.70%)
Low income housing tax credit amortization 6.90% 5.60% 3.60%
Equity compensation 0.10% 0.30% (0.20%)
Non-deductible merger expenses 0.00% 0.00% 0.10%
Other (1.20%) (0.10%) 0.30%
Effective Tax Rate 25.90% 27.00% 27.90%