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INCOME TAXES - Reconciliation of income taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Effective Income Tax Rate Reconciliation, Amount [Abstract]    
Income tax expense computed at 21% statutory rate $ 6,943 $ 2,140
Permanent differences (57) (30)
State taxes, net of federal expense 1,150 394
Low income housing investment (36)  
Valuation allowance 372  
Other, net 157 (321)
Income tax expense $ 8,529 $ 2,183
Effective income tax rate (as a percent) 21.00% 21.00%