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LOANS AND CREDIT QUALITY - Loan Modifications, Financial Effect (Details)	3 Months Ended	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2022
Commercial loans, adjusted for credit analysis | Commercial business | Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Weighted average contractual interest rate, before modification	5.72%	5.72%
Weighted average contractual interest rate, after modification	4.00%	4.00%
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)		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	4.38%	4.35%
Weighted average contractual interest rate, after modification	4.13%	3.39%
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	1.83%	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)	3 years 7 months 6 days	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		3.44%
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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