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Employee Benefit Plans (Details) - Officer and Employee Plans [Member] - $ / shares
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares, Outstanding 483,629 487,431
Shares, Granted 52,689  
Shares, Exercised (24,292) (3,242)
Shares, Forfeited/expired (3,289) (560)
Shares, Share conversion 23,468  
Shares, Retained by Cornerstone shareholders in merger 285,209  
Shares, Outstanding 817,414 483,629
Weighted Average Exercisable Price, Outstanding (in dollars per share) $ 10.20 $ 10.21
Weighted Average Exercisable Price Granted (in dollars per share) 15.05  
Weighted Average Exercisable Price Exercised (in dollars per share) 8.79 10.69
Weighted Average Exercisable Price Forfeited (in dollars per share) 10.83 11.00
Weighted Average Exercise Price, Share conversion (in dollars per share) 9.71  
Weighted Average Exercise Price, Retained by Cornerstone shareholders in merger (in dollars per share) 11.22  
Weighted Average Exercise Price, Outstanding (in dollars per share) $ 10.62 $ 10.20