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LOANS AND CREDIT QUALITY - Loan Modifications, Financial Effect (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Commercial loans | Multifamily | Significant Payment Delay
Financing Receivable, Modified [Line Items]
Weighted average time added to life of loans (in years)	3 months 18 days		2 years
Commercial loans | Commercial business | Significant Payment Delay
Financing Receivable, Modified [Line Items]
Weighted average time added to life of loans (in years)	1 year 9 months 18 days		3 years 9 months 18 days	2 years 9 months 18 days
Commercial loans | Commercial business | Term Extension
Financing Receivable, Modified [Line Items]
Weighted average time added to life of loans (in years)	1 year 1 month 6 days		2 years 4 months 24 days	4 months 24 days
Consumer loans | Single family | Significant Payment Delay
Financing Receivable, Modified [Line Items]
Weighted average percent of loan balances capitalized and added to term of loan	2.34%	1.06%	1.67%	1.00%
Consumer loans | Single family | Term Extension
Financing Receivable, Modified [Line Items]
Weighted average time added to life of loans (in years)	5 years 7 months 6 days	2 years 9 months 18 days	6 years 4 months 24 days	3 years

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