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ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Concentration of Credit Risk (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Jun. 30, 2021
Nov. 13, 2020
ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES              
Contingent consideration asset with an initial fair value             $ 3,100
Business Combination Period Of Quarterly Payments     3 years        
Merger related expenses $ 1,660 $ 1,288 $ 4,309 $ 3,542      
Performance based incentive fees $ 0   $ 0        
Collateral concentration risk | Loan portfolio | Real estate              
ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES              
Concentration risk (as a percent)     72.40%   66.90%    
Teton Financial Services              
ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES              
Total assets           $ 420,700  
Total Deposit           374,600  
Total loans           $ 267,900  
Merger related expenses     $ 400