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Loans Receivable - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accrued interest receivable for loans | $ 77,349 | $ 57,070
Financing Receivable, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] | Interest receivable | Interest receivable
Loans pledged to secure borrowings from the Federal Home Loan Bank | $ 8,941,201 | $ 8,224,951
Approximate rate reduction concession, minimum | 1.00% |
Approximate rate reduction concession, maximum | 2.00% |
TDR outstanding balance | $ 46,117 | 56,817
Percent of restructured loans performing | 97.90% |
Single family residential loans as percentage of restructured loans | 84.70% |
Minimum |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Term for payment and rate reduction | 6 months |
Maximum |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Term for payment and rate reduction | 12 months |
Financing Receivable from Related Party Including Unfunded Loan Commitment |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans granted to officers, directors, and related interests | $ 134,860 | $ 144,178

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