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INCOME TAXES - Components of Income Tax Expense (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Current:                      
Federal tax expense                 $ 2,639 $ 6,775 $ 8,705
State tax expense                 550 1,230 1,039
Total current tax expense                 3,189 8,005 9,744
Deferred tax expense                 1,020 (443) 2,898
Impact of federal tax reform enactment                 0 0 3,988
Income Tax Expense (Benefit) $ 362 $ 780 $ 1,364 $ 1,703 $ 1,426 $ 2,076 $ 2,123 $ 1,937 $ 4,209 $ 7,562 $ 16,630