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LOANS AND CREDIT QUALITY - Loan Modifications, Financial Effect (Details) - Consumer loans	Mar. 31, 2022
Single family
Financing Receivable, Troubled Debt Restructuring [Line Items]
Weighted average contractual interest rate, before modification	4.28%
Weighted average contractual interest rate, after modification	3.25%
Weighted average percent of loan balances capitalized and added to term of loan	0.30%
Weighted average time added to life of loans (in years)	3 years 2 months 12 days
Home equity and other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Weighted average percent of loan balances capitalized and added to term of loan	6.30%
Weighted average time added to life of loans (in years)	16 years 1 month 6 days

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- Definition

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X

- Definition

Financing Receivable, Weighted Average Interest Rate, After Loan Modification

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X

- Definition

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- Definition

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