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Income Taxes - Reconciliation between Statutory Federal Income Tax Rate and Effective Income Tax Rate (Detail)
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Effective Income Tax Rate Reconciliation, Percent [Abstract]      
Statutory federal income tax rate 21.00% 21.00% 21.00%
Effect of non-taxable interest income (1.06%) (0.68%) (1.89%)
Stock compensation 0.56% 0.28% 0.38%
State income taxes, net of federal benefit 2.22% 2.97% 2.70%
Other 0.27% (0.33%) 0.45%
Effective income tax rate 22.99% 23.24% 22.64%