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Income Taxes Schedule of Components of Income Tax Expense (Benefit) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Current Income Tax Expense (Benefit) [Abstract]                      
Current federal tax expense                 $ 131 $ 2,839 $ 5,881
Current state tax expense                 448 425 1,338
Current tax expense                 579 3,264 7,219
Deferred Income Tax Expense (Benefit) [Abstract]                      
Deferred federal tax expense (benefit)                 1,657 (1,000) 1,036
Deferred state tax expense (benefit)                 90 (108) 122
Deferred Income Tax Expense (Benefit)                 1,747 (1,108) 1,158
Total income tax expense $ 486 $ (936) $ (454) $ (1,422) $ (1,199) $ 3,020 $ (1,621) $ (2,356) $ 2,326 $ 2,156 $ 8,377