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LOANS RECEIVABLE - Summary of Aging Analysis of Modifications (Details) $ in Thousands	Sep. 30, 2024 USD ($)
Current
Financing Receivable Modifications [Line Items]
Financing receivable, modified in period	$ 12,831
30-89 Days Past Due
Financing Receivable Modifications [Line Items]
Financing receivable, modified in period	42
90 Days and Over
Financing Receivable Modifications [Line Items]
Financing receivable, modified in period	23
Total Past Due
Financing Receivable Modifications [Line Items]
Financing receivable, modified in period	65
Multifamily | Current
Financing Receivable Modifications [Line Items]
Financing receivable, modified in period	11,448
Multifamily | 30-89 Days Past Due
Financing Receivable Modifications [Line Items]
Financing receivable, modified in period	0
Multifamily | 90 Days and Over
Financing Receivable Modifications [Line Items]
Financing receivable, modified in period	0
Multifamily | Total Past Due
Financing Receivable Modifications [Line Items]
Financing receivable, modified in period	0
Nonresidential mortgage | Current
Financing Receivable Modifications [Line Items]
Financing receivable, modified in period	922
Nonresidential mortgage | 30-89 Days Past Due
Financing Receivable Modifications [Line Items]
Financing receivable, modified in period	0
Nonresidential mortgage | 90 Days and Over
Financing Receivable Modifications [Line Items]
Financing receivable, modified in period	0
Nonresidential mortgage | Total Past Due
Financing Receivable Modifications [Line Items]
Financing receivable, modified in period	0
Residential Mortgage | Current
Financing Receivable Modifications [Line Items]
Financing receivable, modified in period	461
Residential Mortgage | 30-89 Days Past Due
Financing Receivable Modifications [Line Items]
Financing receivable, modified in period	42
Residential Mortgage | 90 Days and Over
Financing Receivable Modifications [Line Items]
Financing receivable, modified in period	0
Residential Mortgage | Total Past Due
Financing Receivable Modifications [Line Items]
Financing receivable, modified in period	42
Home equity loans | Current
Financing Receivable Modifications [Line Items]
Financing receivable, modified in period	0
Home equity loans | 30-89 Days Past Due
Financing Receivable Modifications [Line Items]
Financing receivable, modified in period	0
Home equity loans | 90 Days and Over
Financing Receivable Modifications [Line Items]
Financing receivable, modified in period	23
Home equity loans | Total Past Due
Financing Receivable Modifications [Line Items]
Financing receivable, modified in period	$ 23

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