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INCOME TAXES - Federal income tax (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Federal income tax expense:        
Federal income tax, at statutory rate $ 3,907 $ 2,995 $ 12,156 $ 6,806
Federal income tax, at statutory rate (as a percent) 21.00% 21.00% 21.00% 21.00%
Increase (decrease) resulting from:        
Federally tax exempt interest income $ (352) $ (372) $ (1,072) $ (1,099)
Federally tax exempt interest income (as a percent) (1.90%) (2.60%) (1.80%) (3.40%)
State taxes, net of federal benefit $ 1,353 $ 1,039 $ 4,170 $ 2,397
State taxes, net of federal benefit (as a percent) 7.30% 7.30% 7.20% 7.40%
Other $ (16) $ 39 $ (44) $ 105
Other (as a percent) (0.10%) 0.20% (0.10%) 0.30%
Income tax expense $ 4,892 $ 3,701 $ 15,210 $ 8,209
Total (as a percent) 26.30% 25.90% 26.30% 25.30%