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INCOME TAXES - Income tax expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Current tax expense:    
Federal $ 841 $ 1,865
State 292 372
Total tax expense: 1,133 2,237
Deferred tax expense/(benefit):    
Federal (122) 120
State 68 92
Total deferred tax expense/(benefit): (54) 212
Total $ 1,079 $ 2,449