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EQUITY (Details) - USD ($)
 1 Months Ended 12 Months Ended
Jan. 31, 2017
Jan. 31, 2015
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Nov. 30, 2017
Jan. 31, 2016
Mar. 31, 2015
May 20, 2014
EQUITY                    
Number of shares repurchased or acquired through tender offer     1,155,157 864,483 796,822          
Central Bank                    
EQUITY                    
Retained earnings     $ 46,600,000              
Common Stock | Repurchase Agreements                    
EQUITY                    
Number of shares repurchased           4,122,881        
Amount authorized under the 2014 Repurchase Plan                 $ 75,000,000 $ 30,000,000
Repurchased amount           $ 93,500,000        
Increase in authorized amount   $ 25,000,000                
Common Stock | 2016 Repurchase Plan [Member]                    
EQUITY                    
Value of shares repurchased or acquired through tender offer $ 100,000       $ 18,200,000          
Number of shares repurchased or acquired through tender offer 1,750       796,822          
Amount authorized under the 2014 Repurchase Plan $ 30,000,000.0             $ 30,000,000.0    
Common Stock | 2017 Repurchase Plan [Member]                    
EQUITY                    
Value of shares repurchased or acquired through tender offer     $ 32,800,000 $ 26,500,000            
Number of shares repurchased or acquired through tender offer     1,155,157 862,733            
Amount authorized under the 2014 Repurchase Plan             $ 50,000,000.0      
Remaining amount available for repurchase     $ 20,700,000