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LOANS AND CREDIT QUALITY - Narrative (Details)
 3 Months Ended 6 Months Ended
Jun. 30, 2022
USD ($)
Jun. 30, 2022
USD ($)
portfolioSegment
Dec. 31, 2021
USD ($)
Financing Receivable, Impaired [Line Items]      
Number of portfolio segments | portfolioSegment   2  
Loans held for investment ("LHFI") (net of allowance for credit losses of $37,355 and $47,123) $ 6,722,382,000 $ 6,722,382,000 $ 5,495,726,000
Allowance for unfunded commitments 2,800,000 2,800,000 2,400,000
Accrued interest receivable 20,600,000 $ 20,600,000 $ 17,800,000
Loan modifications, modified in the past 12 months, subsequently defaulted $ 0    
California | Multifamily      
Financing Receivable, Impaired [Line Items]      
Percentage of loan portfolio 36.00% 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 $37,355 and $47,123) $ 3,300,000,000 $ 3,300,000,000 $ 2,800,000,000
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 $37,355 and $47,123) $ 466,000,000 $ 466,000,000 $ 419,000,000