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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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