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Income Taxes (Details 1) - 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 provision for income tax expense                 $ 11,316 $ 11,032 $ 13,179
Tax at statutory federal income tax rate                 3,847 3,751 4,481
Tax Cuts and Jobs Act                 3,139 0 0
State restructuring                 966 0 0
Tax-exempt income                 (394) (314) (369)
State income tax, net of federal tax benefit                 323 290 376
Other, net                 21 23 92
Total income tax expense $ 4,979 $ 847 $ 983 $ 1,093 $ 1,052 $ 1,003 $ 730 $ 965 $ 7,902 $ 3,750 $ 4,580
Tax at statutory federal income tax rate (in percent)                 34.00% 34.00% 34.00%
Tax Cuts and Jobs Act (in percent)                 27.74% 0.00% 0.00%
State restructuring (in percent)                 8.54% 0.00% 0.00%
Tax-exempt income (in percent)                 (3.48%) (2.85%) (2.80%)
State income tax, net of federal tax benefit (in percent)                 2.85% 2.63% 2.85%
Other, net (in percent)                 0.18% 0.21% 0.70%
Provision for income tax expense (in percent)                 69.83% 33.99% 34.75%