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LOANS AND CREDIT QUALITY - Loan Modifications, Financial Effect (Details)	12 Months Ended
	Dec. 31, 2022
Commercial business | Commercial business | Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Weighted average contractual interest rate, before modification	5.72%
Weighted average contractual interest rate, after modification	4.00%
Commercial business | 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
Consumer loans | Single Family | Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Weighted average contractual interest rate, before modification	4.25%
Weighted average contractual interest rate, after modification	3.31%
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	0.22%
Consumer loans | Single Family | Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Weighted average time added to life of loans (in years)	4 years 4 months 24 days
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	3.47%
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

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