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Income Taxes - Reconciliation between Statutory Federal Income Tax Rate and Effective Income Tax Rate (Detail) | 3 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024
Income Tax Disclosure [Abstract] |  |
Statutory federal income tax rate | 21.00% | 21.00%
Effect of non-taxable interest income | (1.12%) | (0.43%)
Stock compensation | 0.73% | 0.35%
State income taxes, net of federal benefit | 2.29% | 2.81%
Executive officer compensation & other | (1.19%) | (0.51%)
Effective income tax rate | 21.71% | 23.22%

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