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Capital Issuance and Redemption (Details)
$ / shares in Units, $ in Millions
3 Months Ended
Nov. 08, 2016
shares
Nov. 08, 2016
USD ($)
Feb. 05, 2016
$ / shares
shares
Mar. 31, 2017
shares
Sep. 30, 2016
shares
Dec. 31, 2017
shares
Dec. 31, 2016
shares
Nov. 02, 2016
$ / shares
Jan. 17, 2012
$ / shares
Class of Stock [Line Items]                  
Liquidation value per share (in dollars per share) | $ / shares                 $ 1,000
Series D Preferred Stock                  
Class of Stock [Line Items]                  
Number of shares issued in connection with the acquisition     3,000            
Preferred stock, dividend rate     7.00%            
Liquidation value per share (in dollars per share) | $ / shares     $ 1,000            
Preferred stock, redemption price (in dollars per share) | $ / shares     $ 1,000            
Preferred stock, shares outstanding           745 1,078    
Number of shares currently deliverable upon conversion     39.8883            
Number of shares converted       333 1,922        
Series B Senior Non-cumulative Perpetual Convertible Stock | CIC Bancshares, Inc.                  
Class of Stock [Line Items]                  
Number of shares issued in connection with the acquisition     3,000            
Preferred stock, dividend rate     7.00%            
Common Stock                  
Class of Stock [Line Items]                  
Number of shares issued upon conversion       13,283 76,665        
Public Stock Offering                  
Class of Stock [Line Items]                  
Number of shares sold in public offering 1,379,690                
Proceeds from issuance of common stock | $   $ 49.7              
Public Stock Offering | Common Stock                  
Class of Stock [Line Items]                  
Common stock, share price (in dollars per share) | $ / shares               $ 36.24