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Federal 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
Federal Income Taxes [Abstract]                    
Federal income taxes at statutory rate                 $ 4,557 $ 2,328
Tax-exempt interest and dividend preference                 (469) (643)
Rate change                 1,846  
Stock Options                 (331)  
Bank owned life insurance                 (145) (77)
Other, net (decrease) increase                 (2) 261
Income tax expense $ 2,682 $ 1,001 $ 746 $ 1,027 $ 930 $ 81 $ 378 $ 480 $ 5,456 $ 1,869