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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

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