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SHAREHOLDERS' EQUITY AND REGULATORY CAPITAL - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 9 Months Ended 41 Months Ended
Oct. 22, 2024
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Apr. 19, 2021
Sep. 30, 2015
Equity, Class of Treasury Stock [Line Items]                
Number of shares reserved to be issued (in shares)   1,045,000   1,045,000   1,045,000    
Number of shares available to be issued under employee stock purchase plan (in shares)   665,000   665,000   665,000    
Number of shares authorized to be repurchased (in shares)             978,000 416,000
Stock repurchase program, additional number of shares authorized to be repurchased             562,000  
Treasury stock, shares acquired (in shares)   125,091 3,446 236,256 35,380 949,533    
Acquisition of treasury stock           $ 21.2    
Acquisition of treasury stock (in usd per share)           $ 22.36    
Stock repurchase program, shares available for future repurchase   28,467   28,467   28,467    
Stock repurchase program percentage of outstanding shares of common stock available for future purchase   0.10%   0.10%   0.10%    
Subsequent Event                
Equity, Class of Treasury Stock [Line Items]                
Dividends declared per share (in usd per share) $ 0.23              
Common Stock                
Equity, Class of Treasury Stock [Line Items]                
Treasury stock, shares acquired (in shares)   0   0