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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, 2023
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Amount                      
Income before income tax expense                 $ 42,944 $ 44,981 $ 40,060
U.S. federal income tax expense                 9,018 9,446 8,413
Nontaxable income                 (1,073) (1,338) (1,347)
Nondeductible expenses                 67 50 38
Other                 53 (93) 4
Income tax expense $ 1,916 $ 1,870 $ 2,117 $ 2,163 $ 2,270 $ 2,128 $ 2,141 $ 1,526 $ 8,065 $ 8,065 $ 7,108
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)                 (2.50%) (3.00%) (3.40%)
Nondeductible expenses (as a percent)                 0.20% 0.10% 0.10%
Other (as a percent)                 0.10% (0.20%) 0.00%
Income tax expense (as a percent)                 18.80% 17.90% 17.70%