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SHAREHOLDERS’ EQUITY AND REGULATORY CAPITAL - Narrative (Detail) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Jan. 20, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Sep. 30, 2015
Class of Stock [Line Items]          
Common stock reserved to be issued under dividend reinvestment and stock purchase plan (in shares)   1,045,000      
Shares available to be issued under the plan (in shares)   665,000      
Outstanding shares of common stock authorized to be repurchased (in shares)         416,000
Shares repurchased under the program (in shares)   154,680      
Total cost of shares repurchased under the program   $ 2.6      
Shares repurchased under the program, price per share (in dollars per share)   $ 16.88      
Cash dividend declared by the Board (in dollars per share)   $ 0.68 $ 0.60 $ 0.51  
Amount available for dividend distribution   $ 47.4      
Maximum amount available to loan nonbank affiliates   $ 199.9      
Subsequent Event          
Class of Stock [Line Items]          
Cash dividend declared by the Board (in dollars per share) $ 0.18        
Maximum          
Class of Stock [Line Items]          
Outstanding shares of common stock authorized to be repurchased (as a percent)         5.00%