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INCOME TAXES - Federal income tax (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Federal income tax expense:      
Federal income tax, at statutory rate $ 16,000 $ 16,078 $ 10,410
Federal income tax, at statutory rate (as a percent) 21.00% 21.00% 21.00%
Increase (decrease) resulting from:      
Federally tax exempt interest income $ (1,618) $ (1,426) $ (1,470)
Federally tax exempt interest income (as a percent) (2.10%) (1.90%) (3.00%)
State taxes, net of federal benefit $ 5,285 $ 5,430 $ 3,631
State taxes, net of federal benefit (as a percent) 6.90% 7.10% 7.40%
Other $ 67 $ 209 $ 157
Other (as a percent) 0.10% 0.30% 0.30%
Income tax expense $ 19,734 $ 20,291 $ 12,728
Total (as a percent) 25.90% 26.50% 25.70%