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Earnings per Share (Details 2) - shares
6 Months Ended 12 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Schedule Of Common Stock Outstanding [Roll Forward]      
Outstanding, beginning of period 5,441,190 5,233,986 5,233,986
Issuance of stock: 4% stock dividend 217,155 209,359 209,359
Purchase of treasury stock (15,301) 0 (2,155)
Outstanding, end of period 5,643,044 5,443,344 5,441,190