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Loans Receivable - Schedule of Collateral-Dependent Loans (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Sep. 30, 2024
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Net loans | $ 20,920,001 | $ 20,916,354
Residential real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Net loans | 2,020 |
Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Net loans | 39,838 |
Commercial loans | Residential real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Net loans | 0 |
Commercial loans | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Net loans | 39,838 |
Commercial loans | Multi-family | Residential real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Net loans | 0 |
Commercial loans | Multi-family | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Net loans | 10,477 |
Commercial loans | Commercial real estate | Residential real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Net loans | 0 |
Commercial loans | Commercial real estate | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Net loans | 29,361 |
Commercial loans | Commercial & industrial | Residential real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Net loans | 0 |
Commercial loans | Commercial & industrial | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Net loans | 0 |
Commercial loans | Construction | Residential real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Net loans | 0 |
Commercial loans | Construction | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Net loans | 0 |
Commercial loans | Land - acquisition & development | Residential real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Net loans | 0 |
Commercial loans | Land - acquisition & development | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Net loans | 0 |
Consumer loans | Residential real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Net loans | 2,020 |
Consumer loans | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Net loans | 0 |
Consumer loans | Construction | Residential real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Net loans | 88 |
Consumer loans | Construction | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Net loans | 0 |
Consumer loans | Single-family residential | Residential real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Net loans | 1,720 |
Consumer loans | Single-family residential | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Net loans | 0 |
Consumer loans | Land - consumer lot loans | Residential real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Net loans | 0 |
Consumer loans | Land - consumer lot loans | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Net loans | 0 |
Consumer loans | HELOC | Residential real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Net loans | 212 |
Consumer loans | HELOC | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Net loans | 0 |
Consumer loans | Consumer | Residential real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Net loans | 0 |
Consumer loans | Consumer | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Net loans | $ 0 |

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