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Income Taxes - Income Tax Provision (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                      
Federal                 $ 1,243 $ 2,771 $ 3,158
State                 2,130 187 1,283
Total current income tax expense                 3,373 2,958 4,441
Deferred income tax (benefit) expense                      
Federal                 (25) 104 69
State                 7 33 25
Total deferred income tax (benefit) expense                 (18) 137 94
Total provision $ 1,169 $ 507 $ 442 $ 1,237 $ 375 $ 163 $ 2,366 $ 191 $ 3,355 $ 3,095 $ 4,535