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INCOME TAXES - Summary of Income Tax Expenses (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Income Tax Disclosure [Abstract]        
Current expense $ 125 $ 136 $ 348 $ 195
Deferred expense 249 380 518 745
Income tax expense $ 374 $ 516 $ 866 $ 940