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LOANS RECEIVABLE - Schedule of Collateral-Dependent Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Sep. 30, 2024
Financing Receivable, Past Due [Line Items]
Loans receivable, net	$ 20,088,618	$ 20,916,354
Residential real estate
Financing Receivable, Past Due [Line Items]
Loans receivable, net	4,074
Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans receivable, net	116,164
General Business Assets
Financing Receivable, Past Due [Line Items]
Loans receivable, net	11,000
Commercial loans | Residential real estate
Financing Receivable, Past Due [Line Items]
Loans receivable, net	0
Commercial loans | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans receivable, net	116,164
Commercial loans | General Business Assets
Financing Receivable, Past Due [Line Items]
Loans receivable, net	11,000
Commercial loans | Multi-family | Residential real estate
Financing Receivable, Past Due [Line Items]
Loans receivable, net	0
Commercial loans | Multi-family | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans receivable, net	23,856
Commercial loans | Multi-family | General Business Assets
Financing Receivable, Past Due [Line Items]
Loans receivable, net	0
Commercial loans | Commercial real estate | Residential real estate
Financing Receivable, Past Due [Line Items]
Loans receivable, net	0
Commercial loans | Commercial real estate | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans receivable, net	88,908
Commercial loans | Commercial real estate | General Business Assets
Financing Receivable, Past Due [Line Items]
Loans receivable, net	0
Commercial loans | Commercial & industrial | Residential real estate
Financing Receivable, Past Due [Line Items]
Loans receivable, net	0
Commercial loans | Commercial & industrial | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans receivable, net	0
Commercial loans | Commercial & industrial | General Business Assets
Financing Receivable, Past Due [Line Items]
Loans receivable, net	11,000
Commercial loans | Construction | Residential real estate
Financing Receivable, Past Due [Line Items]
Loans receivable, net	0
Commercial loans | Construction | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans receivable, net	3,400
Commercial loans | Construction | General Business Assets
Financing Receivable, Past Due [Line Items]
Loans receivable, net	0
Commercial loans | Land - acquisition & development | Residential real estate
Financing Receivable, Past Due [Line Items]
Loans receivable, net	0
Commercial loans | Land - acquisition & development | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans receivable, net	0
Commercial loans | Land - acquisition & development | General Business Assets
Financing Receivable, Past Due [Line Items]
Loans receivable, net	0
Consumer loans | Residential real estate
Financing Receivable, Past Due [Line Items]
Loans receivable, net	4,074
Consumer loans | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans receivable, net	0
Consumer loans | General Business Assets
Financing Receivable, Past Due [Line Items]
Loans receivable, net	0
Consumer loans | Construction | Residential real estate
Financing Receivable, Past Due [Line Items]
Loans receivable, net	760
Consumer loans | Construction | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans receivable, net	0
Consumer loans | Construction | General Business Assets
Financing Receivable, Past Due [Line Items]
Loans receivable, net	0
Consumer loans | Single-family residential | Residential real estate
Financing Receivable, Past Due [Line Items]
Loans receivable, net	3,257
Consumer loans | Single-family residential | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans receivable, net	0
Consumer loans | Single-family residential | General Business Assets
Financing Receivable, Past Due [Line Items]
Loans receivable, net	0
Consumer loans | Land - consumer lot loans | Residential real estate
Financing Receivable, Past Due [Line Items]
Loans receivable, net	7
Consumer loans | Land - consumer lot loans | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans receivable, net	0
Consumer loans | Land - consumer lot loans | General Business Assets
Financing Receivable, Past Due [Line Items]
Loans receivable, net	0
Consumer loans | HELOC | Residential real estate
Financing Receivable, Past Due [Line Items]
Loans receivable, net	50
Consumer loans | HELOC | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans receivable, net	0
Consumer loans | HELOC | General Business Assets
Financing Receivable, Past Due [Line Items]
Loans receivable, net	0
Consumer loans | Consumer | Residential real estate
Financing Receivable, Past Due [Line Items]
Loans receivable, net	0
Consumer loans | Consumer | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans receivable, net	0
Consumer loans | Consumer | General Business Assets
Financing Receivable, Past Due [Line Items]
Loans receivable, net	$ 0

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