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Business Combinations - Pro-forma information (Details) - Bank shares, Inc [Member] - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Business Acquisition [Line Items]    
Net interest income $ 142,354 $ 122,413
Net income available to common shareholders $ 30,466 $ 27,070
EPS - basic (in dollars per share) $ 0.81 $ 0.74
EPS - diluted (in dollars per share) $ 0.80 $ 0.73