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Income Taxes Schedule of Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Income before income tax expense | $ 2,536 | $ 6,765 | $ 3,867 | $ 4,486 | $ 3,551 | $ 3,520 | $ 2,340 | $ 4,819 | $ 17,654 | $ 14,231 | $ 17,065
Income tax reconciliation, tax expense at statutory federal rate of 21%, 35%, and 35% applied to income before income tax expense, respectively |  |  |  |  |  |  |  |  | 3,707 | 4,981 | 5,973
Income tax reconciliation, state income tax, net of federal effect |  |  |  |  |  |  |  |  | 803 | 511 | 206
Income tax reconciliation, tax exempt security and loan income, net of TEFRA adjustments |  |  |  |  |  |  |  |  | (847) | (1,045) | (1,114)
Income tax reconciliation, bank-owned life insurance |  |  |  |  |  |  |  |  | (250) | (438) | (341)
Income tax reconciliation, tax credits, net |  |  |  |  |  |  |  |  | (2,157) | (2,390) | (2,696)
Income tax reconciliation, deferred tax revaluation adjustment |  |  |  |  |  |  |  |  | 0 | 629 | 0
Income tax reconciliation, other adjustments |  |  |  |  |  |  |  |  | 95 | 78 | 128
Total income tax expense | $ 1,528 | $ (1,464) | $ (578) | $ (837) | $ 486 | $ (936) | $ (454) | $ (1,422) | $ 1,351 | $ 2,326 | $ 2,156
Effective tax rate |  |  |  |  |  |  |  |  | 7.65% | 16.34% | 12.63%

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