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INCOME TAXES - Federal income tax (Details) - USD ($)
 12 Months Ended
Oct. 11, 2019
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Federal income tax expense:        
Federal income tax, at statutory rate   $ 16,078,000 $ 10,410,000 $ 3,933,000
Federal income tax, at statutory rate (as a percent)   21.00% 21.00% 5.50%
Increase (decrease) resulting from:        
Federally tax exempt interest income   $ (1,426,000) $ (1,470,000) $ (372,000)
Federally tax exempt interest income (as a percent)   (1.90%) (3.00%) (0.50%)
State taxes, net of federal benefit   $ 5,430,000 $ 3,631,000 $ 2,212,000
State taxes, net of federal benefit (as a percent)   7.10% 7.40% 3.10%
Change in tax status       $ (534,000)
Change in tax status (as a percent)       (0.80%)
Other   $ 209,000 $ 157,000 $ 17,000
Other (as a percent)   0.30% 0.30%  
Income tax expense $ (534,000) $ 20,291,000 $ 12,728,000 $ 5,256,000
Total (as a percent)   26.50% 25.70% 7.30%