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LOANS AND CREDIT QUALITY - Narrative (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
USD ($)
loan
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
loan
portfolioSegment
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Financing Receivable, Impaired [Line Items]          
Number of portfolio segments | portfolioSegment     2    
Recovery of allowance for credit losses $ (5,000) $ 0 $ (9,000) $ 20,469  
Allowance for unfunded commitments 2,500   2,500   $ 1,600
Accrued interest receivable 18,100   $ 18,100   $ 21,200
Number of days past due for consumer loans TDR to be re-default     60 days    
Number of days past due for commercial loans TDR to be re-default     90 days    
Loans granted forbearance, outstanding balance $ 43,000   $ 43,000    
Number of loans granted forbearance | loan 100   100    
Commercial business          
Financing Receivable, Impaired [Line Items]          
Loans granted forbearance, outstanding balance $ 18,000   $ 18,000    
Consumer Loan          
Financing Receivable, Impaired [Line Items]          
Loans granted forbearance, outstanding balance $ 25,000   $ 25,000    
California | Multifamily          
Financing Receivable, Impaired [Line Items]          
Percentage of loan portfolio 29.00%   29.00%   19.00%
Federal Home Loan Bank Advances          
Financing Receivable, Impaired [Line Items]          
Loans pledged as collateral $ 1,700,000   $ 1,700,000   $ 1,400,000
Federal Reserve Bank Advances          
Financing Receivable, Impaired [Line Items]          
Loans pledged as collateral $ 430,000   $ 430,000   $ 569,000