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INCOME TAXES - Components of provision for income taxes (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Current:      
Federal $ 1,807 $ (807) $ 1,976
State 410 280 589
Total current tax 2,217 (527) 2,565
Deferred:      
Federal (120) (16) 93
State (12) 7 14
Total deferred tax (132) (9) 107
Provision for (benefit from) income taxes $ 2,085 $ (536) $ 2,672