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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, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Current Income Tax Expense (Benefit) [Abstract]                      
Current federal tax expense                 $ 5,881 $ 4,235 $ 3,605
Current state tax expense                 1,338 1,459 1,356
Current tax expense                 7,219 5,694 4,961
Deferred Income Tax Expense (Benefit) [Abstract]                      
Deferred federal tax expense (benefit)                 1,036 1,299 2,257
Deferred state tax expense (benefit)                 122 90 171
Deferred tax expense (benefit)                 1,158 1,389 2,428
Total income tax expense $ 2,185 $ 2,060 $ 1,962 $ 2,170 $ 1,453 $ 1,883 $ 1,994 $ 1,753 $ 8,377 $ 7,083 $ 7,389