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Earnings per Share (Details 2) - shares
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Schedule Of Common Stock Outstanding [Roll Forward]      
Outstanding, beginning of year 5,441,190 5,233,986 5,032,679
Issuance of stock as 4% stock dividend 217,155 209,359 201,307
Purchase of treasury stock (41,738) (2,155) 0
Outstanding, end of year 5,616,607 5,441,190 5,233,986