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ACQUISITIONS - General Information (Details)
$ / shares in Units, $ in Thousands
Sep. 07, 2021
USD ($)
$ / shares
Feb. 04, 2020
USD ($)
location
$ / shares
Sep. 30, 2021
location
Business Combination, Description [Abstract]      
Number of offices and branches | location     33
Pacific Enterprise Bancorp      
Business Combination, Description [Abstract]      
Exchange ratio 1.0292    
Transaction value $ 53,100    
Share Price | $ / shares $ 17.28    
Ownership interest of acquired entity in combined company 22.20%    
Grand Mountain Bancshares, Inc.      
Business Acquisition, Date of Acquisition [Abstract]      
Business Acquisition, Effective Date of Acquisition   Feb. 04, 2020  
Business Combination, Description [Abstract]      
Transaction value   $ 13,886  
Share Price | $ / shares   $ 3.40  
Number of offices and branches | location   4  
Payments to Acquire Businesses, Gross   $ 13,886