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INCOME TAXES - Components of Income Tax Expenses (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Current year expense (benefit):        
Federal $ 888 $ 1,066 $ 1,090 $ 1,192
State 4 8 (3) 5
Current year expense (benefit) 892 1,074 1,087 1,197
Deferred expense (benefit):        
Federal (521) (948) 214 (216)
State 5 (1) 15 10
Deferred tax expense (benefit) (516) (949) 229 (206)
Income tax expense $ 376 $ 125 $ 1,316 $ 991