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LOANS AND CREDIT QUALITY - Narrative (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
USD ($)
portfolioSegment
Dec. 31, 2021
USD ($)
Financing Receivable, Impaired [Line Items]    
Number of portfolio segments | portfolioSegment 2  
Allowance for unfunded commitments $ 2,200 $ 2,400
Accrued interest receivable 26,900 17,800
Loans held for investment ("LHFI") (net of allowance for credit losses of $41,500 and $47,123) $ 7,384,820 $ 5,495,726
California | Multifamily    
Financing Receivable, Impaired [Line Items]    
Percentage of loan portfolio 36.00% 33.00%
Federal Home Loan Bank Advances | Asset Pledged as Collateral without Right    
Financing Receivable, Impaired [Line Items]    
Loans held for investment ("LHFI") (net of allowance for credit losses of $41,500 and $47,123) $ 5,200,000 $ 2,800,000
Federal Reserve Bank Advances | Asset Pledged as Collateral without Right    
Financing Receivable, Impaired [Line Items]    
Loans held for investment ("LHFI") (net of allowance for credit losses of $41,500 and $47,123) $ 497,000 $ 419,000