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Acquisitions - Independence Bank Acquisition (Details) - USD ($)
$ / shares in Units, $ in Thousands
Jan. 26, 2015
Mar. 31, 2016
Jan. 29, 2016
Dec. 31, 2015
Mar. 31, 2015
Acquisitions          
Closing stock price of common stock ($ per share)     $ 20.53    
Goodwill   $ 102,085   $ 50,832 $ 51,010
IDPK          
Acquisitions          
Consideration paid $ 79,777        
Cash consideration for common stockholders 6,100        
Cash consideration for holders of stock options and warrants 1,500        
Warrants assumed $ 1,300        
Number of shares of common stock issued as consideration 4,480,645        
Value of shares of common stock issued as consideration $ 70,900        
Closing stock price of common stock ($ per share) $ 15.83        
Goodwill $ 27,882