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Income Taxes Schedule of Effective Income Tax Rate Reconciliation (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
Income Tax Disclosure [Abstract]                      
Income before income tax expense $ 3,551 $ 3,520 $ 2,340 $ 4,819 $ 5,167 $ (355) $ 5,344 $ 6,909 $ 14,231 $ 17,065 $ 24,891
Income tax reconciliation, tax expense at statutory federal rate of 35%, 34.42%, and 34% applied to income before income tax expense, respectively                 4,981 5,973 8,568
Income tax reconciliation, state income tax, net of federal effect                 511 206 968
Income tax reconciliation, tax exempt income tax-exempt security and loan income, net of TEFRA adjustments                 (1,045) (1,114) (879)
Income tax reconciliation, tax exempt income bank-owned life insurance                 (438) (341) (330)
Effective Income Tax Rate Reconciliation, Tax Credit, Amount                 (2,390) (2,696) (246)
Income Tax Reconcilation, Deferred Tax Revaluation Adjustment                 629 0 0
Income tax reconciliation, other adjustments                 78 128 296
Total income tax expense $ 486 $ (936) $ (454) $ (1,422) $ (1,199) $ 3,020 $ (1,621) $ (2,356) $ 2,326 $ 2,156 $ 8,377
Effective tax rate                 16.34% 12.63% 33.65%