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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, 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
Income Tax Disclosure [Abstract]                      
Income before income tax expense $ 6,268 $ 6,441 $ 5,820 $ 6,362 $ 5,197 $ 5,436 $ 5,499 $ 5,090 $ 24,891 $ 21,222 $ 21,135
Income tax reconciliation, tax expense at statutory federal rate of 34% applied to income before income tax expense                 8,568 7,305 7,275
Income tax reconciliation, state income tax, net of federal effect                 968 1,000 906
Income tax reconciliation, tax exempt income tax-exempt security and loan income, net of TEFRA adjustments                 (879) (736) (682)
Income tax reconciliation, change in valuation allowance                 0 (1) 59
Income tax reconciliation, tax exempt income bank-owned life insurance                 (330) (296) (291)
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amount                 0 124 0
Effective Income Tax Rate Reconciliation, Tax Credit, Amount                 (246) (375) 0
Income tax reconciliation, other adjustments                 296 62 122
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
Effective tax rate                 33.65% 33.38% 34.96%