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STOCK WARRANTS - Transactions with the U.S. Department of the Treasury (Details) - $ / shares
12 Months Ended
Jan. 16, 2009
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Jan. 31, 2009
Common Stock          
STOCK WARRANTS          
Warrant, exercise price (in dollars per share) $ 14.95 $ 14.95      
Warrant, term 10 years        
Average stock price (in dollars per share)   $ 34.44 $ 23.64 $ 20.91  
Common Stock | Maximum          
STOCK WARRANTS          
Warrant issued to purchase the entity's common stock (in shares) 571,906        
Dividends         $ 0.145
Stock warrants          
STOCK WARRANTS          
Additional dilutive shares in calculating earnings per share   325,615 210,638 163,011