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Loans Receivable - Schedule of Collateral-Dependent Loans (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Sep. 30, 2023
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Loans receivable, net | $ 20,916,354 | $ 17,476,550
Residential real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable, net | 7,157 |
Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable, net | 51,431 |
Commercial loans | Residential real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable, net | 1,194 |
Commercial loans | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable, net | 51,431 |
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 | 18,641 |
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 | 32,790 |
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 | Construction | Residential real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable, net | 1,120 |
Commercial loans | Construction | Commercial real estate |  |
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 | 74 |
Commercial loans | Land - acquisition & development | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable, net | 0 |
Consumer loans | Residential real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable, net | 5,963 |
Consumer loans | Commercial real estate |  |
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 | 88 |
Consumer loans | Construction | Commercial real estate |  |
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 | 5,678 |
Consumer loans | Single-family residential | Commercial real estate |  |
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 | 0 |
Consumer loans | Land - consumer lot loans | Commercial real estate |  |
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 | 197 |
Consumer loans | HELOC | Commercial real estate |  |
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 |

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- Definition Amortized cost excluding accrued interest, after allowance for credit loss, of financing receivable. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479344/326-20-45-1 + Details
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