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SHAREHOLDERS EQUITY - Common stock (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2022
Jan. 06, 2022
Dec. 31, 2021
Nov. 03, 2020
Class of Stock [Line Items]        
Common Stock, par value (in dollars per share) $ 0   $ 0  
Maximum offering price   $ 100    
Common Stock        
Class of Stock [Line Items]        
Common Stock, par value (in dollars per share) $ 0      
Number of votes per each share one      
Issuance of common stock for Teton Acquisition (in shares) 0      
Common Stock | Teton Financial Services        
Class of Stock [Line Items]        
Common stock issued as part of merger 1,337,791      
Common Stock | 2020 Repurchase Plan        
Class of Stock [Line Items]        
Common Stock, par value (in dollars per share)       $ 0
Authorized share repurchase (in shares)     0 400,000