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Earnings per Share (Details 1) - shares
6 Months Ended 12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Schedule Of Common Stock Outstanding [Roll Forward]      
Outstanding, beginning of year 5,616,607 5,441,190 5,441,190
Issuance of stock: 4% stock dividend 224,550 217,155 217,155
Purchase of treasury stock (4,715) (15,301) (41,738)
Outstanding, end of year 5,836,442 5,643,044 5,616,607