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INCOME TAXES - Summary of Income Tax Expenses (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Income Tax Disclosure [Abstract]        
Current expense $ 406 $ 892 $ 754 $ 1,087
Deferred expense 238 (516) 756 229
Income tax expense $ 644 $ 376 $ 1,510 $ 1,316