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INCOME TAXES - Components of Income Tax Expense (Benefit) (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 income taxes:                      
Federal                 $ 3,900 $ 5,720 $ (2,215)
State                 941 5,035 6,006
Total current income tax expense                 4,841 10,755 3,791
Deferred income taxes:                      
Federal                 (1,492) (4,418) (25,938)
State                 870 (1,493) (4,434)
Total deferred income tax expense                 (622) (5,911) (30,372)
Income tax expense (benefit) $ 2,811 $ (5,619) $ 4,308 $ 2,719 $ 6,117 $ 3,301 $ 1,779 $ (6,353) $ 4,219 $ 4,844 $ (26,581)