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EQUITY (Details)
 1 Months Ended 12 Months Ended
Jun. 04, 2015
shares
Apr. 01, 2015
USD ($)
$ / shares
shares
Apr. 07, 2014
USD ($)
shares
Mar. 21, 2014
$ / shares
shares
Feb. 21, 2014
USD ($)
$ / shares
Feb. 20, 2014
USD ($)
shares
Nov. 23, 2010
$ / shares
Dec. 31, 2015
USD ($)
$ / shares
shares
Dec. 31, 2016
USD ($)
$ / shares
shares
Dec. 31, 2015
USD ($)
$ / shares
shares
Dec. 31, 2014
USD ($)
shares
Jan. 31, 2016
USD ($)
Jan. 31, 2015
USD ($)
May 20, 2014
USD ($)
EQUITY                            
Decrease in fair value recorded in noninterest income                 $ 2,907,000 $ 2,428,000 $ 3,253,000      
Other noninterest expense                 $ 17,346,000 $ 17,342,000 $ 18,886,000      
For ownership change to occur, the minimum cumulative increase in the entity's ownership by "5-percent shareholders" over a rolling three-year period (as a percent)                 50.00%          
Number of shares repurchased or acquired through tender offer | shares                 796,822 4,122,881 7,045,620      
Common stock, outstanding shares | shares               31,361,452 30,796,243 31,361,452        
Common stock, par value (in dollars per share) | $ / shares               $ 0 $ 0 $ 0        
Central Bank                            
EQUITY                            
Retained earnings                 $ 83,900,000          
Common Stock                            
EQUITY                            
Number of shares repurchased | shares                     857,554      
Amount authorized under the 2014 Repurchase Plan                           $ 30,000,000
Repurchased amount                     $ 16,500,000      
Common Stock | Repurchase Agreements                            
EQUITY                            
Value of shares repurchased or acquired through tender offer     $ 125,000,000                      
Tender offer price (in dollars per share) | $ / shares       $ 20.20                    
Number of shares of common stock properly tendered and not withdrawn at or below the purchase price | shares       3,369,850                    
Number of shares of common stock tendered through notice of guaranteed delivery at or below the purchase price | shares       167,572                    
Number of shares repurchased or acquired through tender offer | shares     6,188,066 3,405,888                    
Share repurchase percentage of common stock properly tendered and not withdrawn at or below the purchase price       96.60%                    
Share repurchase percentage of issued and outstanding shares of common stock prior to the completion of the tender offer and the private repurchases     14.70%                      
Common stock, outstanding shares | shares     35,900,000                      
Number of shares repurchased | shares                   4,122,881        
Amount authorized under the 2014 Repurchase Plan                         $ 75,000,000  
Repurchased amount                   $ 93,300,000        
Remaining amount available for repurchase                 11,800,000          
Increase in authorized amount               $ 25,000,000            
Common Stock | Repurchase Agreements | Lead Investors                            
EQUITY                            
Value of shares repurchased or acquired through tender offer           $ 56,200,000                
Percentage of shares of common stock held by investors           44.90%                
Common Stock | Repurchase Agreements | Carlyle                            
EQUITY                            
Value of shares repurchased or acquired through tender offer           $ 28,100,000                
Number of shares repurchased or acquired through tender offer | shares           1,391,089                
Number of shares of common stock held by investors | shares           9,463,095                
Percentage of shares of common stock held by investors           22.50%                
Common Stock | Repurchase Agreements | Anchorage                            
EQUITY                            
Number of shares repurchased or acquired through tender offer | shares           1,391,089                
Number of shares of common stock held by investors | shares           9,463,095                
Percentage of shares of common stock held by investors           22.50%                
Common Stock | Underwriting Agreement                            
EQUITY                            
Other noninterest expense   $ 400,000                        
Equity related expense   200,000                        
Value of shares repurchased or acquired through tender offer   $ 175,000,000                        
Common stock, par value (in dollars per share) | $ / shares   $ 0                        
Share Price | $ / shares   $ 23.01                        
Common Stock | Underwriting Agreement | Carlyle                            
EQUITY                            
Number of shares repurchased or acquired through tender offer | shares   3,802,694                        
Common Stock | Underwriting Agreement | Anchorage                            
EQUITY                            
Number of shares repurchased or acquired through tender offer | shares 1,500,000 3,802,694                        
Common Stock | Underwriting Agreement | Carlyle And Anchorage                            
EQUITY                            
Number of shares repurchased or acquired through tender offer | shares   7,605,388                        
Common Stock | Underwriting Agreement | Citigroup Global Markets                            
EQUITY                            
Value of shares repurchased or acquired through tender offer   $ 75,000,000                        
Number of shares repurchased or acquired through tender offer | shares   3,259,452                        
Share Price | $ / shares   $ 23.01                        
Common Stock | Minimum | Repurchase Agreements                            
EQUITY                            
Tender offer price (in dollars per share) | $ / shares         $ 18.50                  
Common Stock | Maximum | Repurchase Agreements                            
EQUITY                            
Value of shares repurchased or acquired through tender offer         $ 68,800,000                  
Tender offer price (in dollars per share) | $ / shares         $ 21.00                  
Common Stock | Maximum | Repurchase Agreements | Anchorage                            
EQUITY                            
Value of shares repurchased or acquired through tender offer           $ 28,100,000                
Junior Participating Preferred Stock, Series C | Rights                            
EQUITY                            
Exercise price of warrant (in dollars per share) | $ / shares             $ 6.00              
Fraction of securities callable by each warrant or right             0.0001              
Common Stock | Repurchase Agreements                            
EQUITY                            
Remaining amount available for repurchase                 11,800,000          
Common Stock | 2016 Repurchase Plan [Member]                            
EQUITY                            
Value of shares repurchased or acquired through tender offer                 $ 18,200,000          
Number of shares repurchased or acquired through tender offer | shares                 796,822          
Amount authorized under the 2014 Repurchase Plan                       $ 30,000,000.0