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LOANS AND CREDIT QUALITY - Loan Modifications, Financial Effect (Details)	3 Months Ended	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2022
Consumer loans | Single family | Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Weighted average contractual interest rate, before modification	4.79%	4.35%
Weighted average contractual interest rate, after modification	3.56%	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	0.51%	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)	6 years 4 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, 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	9 months 18 days

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