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BUSINESS COMBINATIONS - Narrative (Details)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Jul. 31, 2024
USD ($)
shares
Jul. 30, 2024
USD ($)
Sep. 30, 2024
USD ($)
shares
Sep. 30, 2023
USD ($)
Sep. 30, 2024
USD ($)
shares
Sep. 30, 2023
USD ($)
Jul. 31, 2024
full_service_bank_branch
Jul. 31, 2024
loan_production_office
Jul. 31, 2024
Jul. 31, 2024
$ / shares
Business Acquisition [Line Items]                    
Share price (usd per share) | $ / shares                   $ 15.79
Issuance of common stock in business combination (in shares) | shares     13,579,454              
Merger and related expenses     $ 14,605 $ 0 $ 15,645 $ 0        
Restricted Stock Units                    
Business Acquisition [Line Items]                    
Stock-based compensation cost     $ 4   $ 89          
Common Stock                    
Business Acquisition [Line Items]                    
Issuance of common stock in business combination (in shares) | shares [1]     13,497,091   13,497,091          
California BanCorp                    
Business Acquisition [Line Items]                    
Total purchase consideration $ 216,638                  
Acquired company, common stock exchange ratio                 1.590  
Business combination, consideration transferred, equity interests issued and issuable $ 213,944                  
Payment of in-the-money stock options   $ 1,700                
Effective income tax rate reconciliation, percent 29.56%                  
Merger and related expenses     $ 14,605   $ 15,645          
Adjustments made to exclude from proforma net (loss) income     (5,692) $ 15,094 6,515 17,500        
California BanCorp | Former Non-continuing Directors, Officers And Employees                    
Business Acquisition [Line Items]                    
Number of shares issued (in shares) | shares 82,364                  
California BanCorp | Acquisition-related Costs                    
Business Acquisition [Line Items]                    
Adjustments made to exclude from proforma net (loss) income     17,800   20,500 $ (20,500)        
California BanCorp | Allowance For Credit Losses, Non-Purchased Credit Deterioration Loans And Unfunded Commitments                    
Business Acquisition [Line Items]                    
Adjustments made to exclude from proforma net (loss) income     21,300   21,300          
California BanCorp | Allowance For Credit Losses, Non-Purchased Credit Deterioration Loans                    
Business Acquisition [Line Items]                    
Adjustments made to exclude from proforma net (loss) income     18,500   18,500          
California BanCorp | Allowance For Credit Losses, Unfunded Commitments                    
Business Acquisition [Line Items]                    
Adjustments made to exclude from proforma net (loss) income     $ 2,700   $ 2,700          
California BanCorp | Core Deposits                    
Business Acquisition [Line Items]                    
Core deposit intangibles, amortization period 10 years                  
California BanCorp | Restricted Stock Units                    
Business Acquisition [Line Items]                    
Stock-based compensation cost $ 1,100                  
California BanCorp | Restricted Stock Units | Former Non-continuing Directors, Officers And Employees                    
Business Acquisition [Line Items]                    
Number of shares issued (in shares) | shares 123,123                  
Business combination, consideration transferred, equity interests issued and issuable $ 825 1,900                
California BanCorp | Restricted Stock Units | Former Continuing Directors, Officers And Employees                    
Business Acquisition [Line Items]                    
Number of shares issued (in shares) | shares 295,512                  
Business combination, consideration transferred, equity interests issued and issuable $ 4,700 $ 1,300                
Stock-based compensation cost $ 3,400                  
Bay Area | California BanCorp                    
Business Acquisition [Line Items]                    
Number of properties acquired             1 4    
Southern California Region | California BanCorp                    
Business Acquisition [Line Items]                    
Number of properties acquired | full_service_bank_branch             13      
[1] Includes $1.3 million related to replacement awards granted in connection with the business combination for the three and nine months ended September 30, 2024 (Refer to Note 2 - Business Combinations).