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LOANS AND CREDIT QUALITY - Loan Modifications, Financial Effect (Details) - Consumer loans	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Single family | Interest Rate Reduction | High
Financing Receivable, Troubled Debt Restructuring [Line Items]
Weighted average contractual interest rate, after modification		4.28%
Single family | Interest Rate Reduction | Low
Financing Receivable, Troubled Debt Restructuring [Line Items]
Weighted average contractual interest rate, after modification		3.25%
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	2.60%	0.30%
Single family | Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Weighted average time added to life of loans (in years)	14 years 2 months 12 days	3 years 2 months 12 days
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		6.30%
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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