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Income Tax Expense - Schedule of Components of Effective Income Tax Reconciliation (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2024 | Sep. 30, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Amount |  |  |  |  |  |  |  |  |  |  |
Income before income tax expense |  |  |  |  |  |  |  |  | $ 42,381 | $ 42,944 | $ 44,981
U.S. federal income tax expense |  |  |  |  |  |  |  |  | 8,900 | 9,018 | 9,446
Nontaxable income |  |  |  |  |  |  |  |  | (897) | (1,073) | (1,338)
Nondeductible expenses |  |  |  |  |  |  |  |  | 81 | 67 | 50
Other |  |  |  |  |  |  |  |  | 62 | 53 | (93)
Income tax expense | $ 2,236 | $ 2,070 | $ 1,909 | $ 1,930 | $ 1,916 | $ 1,870 | $ 2,117 | $ 2,163 | $ 8,146 | $ 8,065 | $ 8,065
Percent |  |  |  |  |  |  |  |  |  |  |
Income before income tax expense (as a percent) |  |  |  |  |  |  |  |  | 100.00% | 100.00% | 100.00%
U.S. federal income tax expense (as a percent) |  |  |  |  |  |  |  |  | 21.00% | 21.00% | 21.00%
Nontaxable income (as a percent) |  |  |  |  |  |  |  |  | (2.10%) | (2.50%) | (3.00%)
Nondeductible expenses (as a percent) |  |  |  |  |  |  |  |  | 0.20% | 0.20% | 0.10%
Other (as a percent) |  |  |  |  |  |  |  |  | 0.10% | 0.10% | (0.20%)
Income tax expense (as a percent) |  |  |  |  |  |  |  |  | 19.20% | 18.80% | 17.90%

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