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EQUITY (Details) - USD ($)
1 Months Ended 12 Months Ended
Jan. 31, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Jun. 30, 2019
Nov. 30, 2017
EQUITY            
Number of shares repurchased or acquired through tender offer   797,003 1,155,157 864,483    
Central Bank            
EQUITY            
Retained earnings   $ 66,600,000        
Common Stock            
EQUITY            
Value of shares repurchased or acquired through tender offer $ 100,000   $ 32,800,000 $ 26,500,000    
Number of shares repurchased or acquired through tender offer 1,750 308,303 1,155,157 862,733    
Amount authorized under the 2014 Repurchase Plan $ 30,000,000.0       $ 30,000,000.0 $ 50,000,000.0
Remaining amount available for repurchase   $ 6,800,000        
Common Stock | Repurchase Plan            
EQUITY            
Value of shares repurchased or acquired through tender offer   $ 13,900,000        
Number of shares repurchased or acquired through tender offer   488,700        
Common Stock | Existing Share Repurchase Plan            
EQUITY            
Value of shares repurchased or acquired through tender offer   $ 22,800,000        
Number of shares repurchased or acquired through tender offer   797,003        
Common Stock | 2019 Repurchase Plan            
EQUITY            
Value of shares repurchased or acquired through tender offer   $ 8,900,000        
Remaining amount available for repurchase   $ 21,100,000