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Acquisitions (Pro Forma) (Details) - CIC Bancshares, Inc. - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Business Acquisition [Line Items]    
Net interest income $ 296,888 $ 259,531
Net income available to common stockholders $ 80,179 $ 59,491
Basic earnings per share (in dollars per share) $ 3.24 $ 2.63
Diluted earnings per share (in dollars per share) $ 3.20 $ 2.58