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Stock Based Compensation (Details) - Officer and Employee Plans [Member]
 9 Months Ended
Sep. 30, 2015
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Shares, Outstanding 483,629
Shares, Granted 52,689
Shares, Exercised (13,542)
Shares, Forfeited/expired (2,139)
Shares, Share conversion 23,468
Shares, Retained by Cornerstone shareholders in merger 285,209
Shares, Outstanding 829,314
Weighted Average Exercisable Price, Outstanding (in dollars per share) | $ / shares $ 10.20
Weighted Average Exercisable Price Granted (in dollars per share) | $ / shares 15.05
Weighted Average Exercisable Price Exercised (in dollars per share) | $ / shares 9.89
Weighted Average Exercisable Price Forfeited (in dollars per share) | $ / shares 11.94
Weighted Average Exercise Price, Share conversion (in dollars per share) | $ / shares 9.71
Weighted Average Exercise Price, Retained by Cornerstone shareholders in merger (in dollars per share) | $ / shares 11.22
Weighted Average Exercise Price, Outstanding (in dollars per share) | $ / shares $ 10.57