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SHAREHOLDERS' EQUITY - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 12 Months Ended
Jun. 29, 2018
May 25, 2018
Jan. 31, 2018
Jan. 03, 2018
Mar. 06, 2017
Jan. 18, 2017
Mar. 31, 2017
Dec. 31, 2018
Jan. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Oct. 25, 2018
Feb. 16, 2018
Mar. 13, 2017
Subsidiary or Equity Method Investee [Line Items]                            
Authorized repurchase amount                       $ 100,000    
Number of shares repurchased (in shares)               0            
Issuance of common stock               $ 0   $ 88,656 $ 0      
Payments for capital contribution             $ 110,000              
Underwritten Public Offering                            
Subsidiary or Equity Method Investee [Line Items]                            
Issuance of common stock (in shares)         2,012,500                  
Shares issued, price per share (in dollars per share)         $ 46.50                  
Issuance of common stock         $ 88,700                  
Public offering deduction amount         $ 4,900                  
Senior Subordinated Notes                            
Subsidiary or Equity Method Investee [Line Items]                            
Interest rate, stated percentage                           5.75%
Hamilton State Bancshares, Inc.                            
Subsidiary or Equity Method Investee [Line Items]                            
Common shares issued in a business combination (in shares) 6,548,385                          
Increase in shareholders' equity $ 349,400                          
Share price (in dollars per share) $ 53.35                          
Purchase price $ 397,135                          
Atlantic Coast Financial Corporation                            
Subsidiary or Equity Method Investee [Line Items]                            
Common shares issued in a business combination (in shares)   2,631,520                        
Increase in shareholders' equity   $ 147,760                        
Share price (in dollars per share)   $ 56.15                        
Purchase price   $ 169,287                        
US Premium Financing Holding Company                            
Subsidiary or Equity Method Investee [Line Items]                            
Common shares issued in a business combination (in shares)     830,301           1,073,158          
Increase in shareholders' equity     $ 44,500 $ 5,500   $ 5,800                
Share price (in dollars per share)     $ 53.55           $ 53.55          
Purchase of remaining ownership interest in cost method investment     70.00% 25.01%   4.99%     70.00%          
Stock issued during period, shares, purchase of assets (in shares)       114,285   128,572                
Price per share of the Company's common stock (in dollars per share)       $ 48.55   $ 45.45                
Purchase price     $ 8,900 $ 12,500         $ 82,981          
Additional cash payments     $ 5,800           $ 5,800          
Number of shares registered for resale or other disposition (in shares)                         944,586