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SHAREHOLDERS' EQUITY AND REGULATORY CAPITAL - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
9 Months Ended
Oct. 18, 2021
Sep. 30, 2021
Apr. 19, 2021
Sep. 30, 2015
Equity, Class of Treasury Stock [Line Items]        
Number of shares authorized to be repurchased (in shares)       416,000
Acquisition of treasury stock (in shares)   201,518    
Acquisition of treasury stock   $ 3.7    
Acquisition of treasury stock (in usd per share)   $ 18.26    
Stock repurchase program, additional number of shares authorized to be repurchased     562,000  
Stock repurchase program, shares available for future repurchase   776,482    
Stock repurchase program percentage of outstanding shares of common stock available for future purchase   7.00%    
Subsequent Event        
Equity, Class of Treasury Stock [Line Items]        
Dividends declared per share (in usd per share) $ 0.19      
Maximum        
Equity, Class of Treasury Stock [Line Items]        
Stock repurchase program authorized, maximum percentage of outstanding shares of common stock       5.00%