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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, 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
Federal Income Taxes [Abstract]                    
Federal income taxes at statutory rate                 $ 2,725 $ 4,557
Tax-exempt interest and dividend preference                 (258) (469)
Rate change                   1,846
Stock Options                 (112) (331)
Bank owned life insurance                 (47) (145)
Other, net decrease                 (18) (2)
Income tax expense $ 643 $ 629 $ 436 $ 582 $ 2,682 $ 1,001 $ 746 $ 1,027 $ 2,290 $ 5,456