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Income Taxes - Components of Income Tax Expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Current:      
Federal $ 56 $ 129 $ 82
State 69 131 27
Current tax expense 125 260 109
Deferred:      
Federal (380) 0 (3)
State (46) 0 (1)
Deferred tax benefit (426) 0 (4)
Total tax expense (benefit) $ (301) $ 260 $ 105