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LOANS AND CREDIT QUALITY - Loan Modifications, Financial Effect (Details) | 3 Months Ended | 6 Months Ended
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Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Commercial loans, adjusted for credit analysis | Commercial business | Term Extension |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Weighted average time added to life of loans (in years) | 3 months 18 days |  | 3 months 18 days |
Consumer loans | Single family | Interest Rate Reduction |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Weighted average contractual interest rate, before modification | 5.25% | 4.79% | 5.25% | 4.35%
Weighted average contractual interest rate, after modification | 5.00% | 3.56% | 5.00% | 3.36%
Consumer loans | Single family | Significant Payment Delay |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Weighted average percent of loan balances capitalized and added to term of loan | 0.55% | 0.51% | 0.52% | 0.20%
Consumer loans | Single family | Term Extension |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Weighted average time added to life of loans (in years) | 2 years 10 months 24 days | 6 years 4 months 24 days | 5 years 10 months 24 days | 4 years 6 months
Consumer loans | Home equity and other | Significant Payment Delay |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Weighted average percent of loan balances capitalized and added to term of loan |  |  |  | 3.41%
Consumer loans | Home equity and other | Term Extension |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Weighted average time added to life of loans (in years) |  |  |  | 16 years 1 month 6 days
Commercial loans | Commercial business | Term Extension |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Weighted average time added to life of loans (in years) |  |  |  | 9 months 18 days

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