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INCOME TAXES - Federal income tax (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Federal income tax expense:    
Federal income tax, at statutory rate $ 4,368 $ 1,733
Federal income tax, at statutory rate (as a percent) 21.00% 21.00%
Increase (decrease) resulting from:    
Federally tax exempt interest income $ (367) $ (357)
Federally tax exempt interest income (as a percent) (1.80%) (4.30%)
State taxes, net of federal benefit $ 1,514 $ 631
State taxes, net of federal benefit (as a percent) 7.30% 7.60%
Other $ 38 $ 24
Other (as a percent) 0.20% 0.30%
Income tax expense $ 5,553 $ 2,031
Total (as a percent) 26.70% 24.60%