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LOANS AND CREDIT QUALITY - Loan Modifications with Subsequent Default, by Loan Modification (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Commercial business | Commercial business | Significant Payment Delay |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Loan modifications with subsequent default | $ 0 |  | $ 0 |
Commercial business | Commercial business | Term Extension |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Loan modifications with subsequent default | 2,990 |  | 2,990 |
Commercial business | Commercial business | Interest Rate Reduction and Term Extension |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Loan modifications with subsequent default | 0 |  | 0 |
Commercial business | Commercial business | Significant Payment Delay and Term Extension |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Loan modifications with subsequent default | 0 |  | 0 |
Commercial business | Commercial business | Interest Rate Reduction, Significant Payment Delay and Term Extension |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Loan modifications with subsequent default | 0 |  | 0 |
Consumer loans | Single family | Significant Payment Delay |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Loan modifications with subsequent default | 235 | $ 0 | 235 | $ 0
Consumer loans | Single family | Term Extension |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Loan modifications with subsequent default | 0 | 0 | 0 | 0
Consumer loans | Single family | Interest Rate Reduction and Term Extension |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Loan modifications with subsequent default | 0 | 0 | 0 | 0
Consumer loans | Single family | Significant Payment Delay and Term Extension |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Loan modifications with subsequent default | 634 | 0 | 2,879 | 172
Consumer loans | Single family | Interest Rate Reduction, Significant Payment Delay and Term Extension |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Loan modifications with subsequent default | $ 70 | $ 553 | $ 1,162 | $ 1,555

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