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SHAREHOLDERS' EQUITY AND REGULATORY CAPITAL - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Apr. 19, 2021
Mar. 31, 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)   154,680  
Acquisition of treasury stock   $ 2.6  
Acquisition of treasury stock (in usd per share)   $ 16.88  
Stock repurchase program, shares available for future repurchase   823,320  
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]      
Stock repurchase program, additional number of shares authorized to be repurchased 562,000    
Dividends declared per share (in usd per share) $ 0.18    
Maximum      
Equity, Class of Treasury Stock [Line Items]      
Stock repurchase program authorized, maximum percentage of outstanding shares of common stock     5.00%