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Fair Value Measurements - Narrative (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Sep. 30, 2024
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Available-for-sale securities purchased | $ 310,999,000 | $ 49,380,000 |
Proceeds from sales of available-for-sale securities | 797,000 | 2,624,000 |
Held-to-maturity securities purchased | 114,182,000 | 0 |
Proceeds from sale of held-to-maturity securities | $ 0 | $ 0 |
Term of contractual due dates, mortgage-backed securities | 25 years |  |
Accrued interest for available-for-sale securities | $ 10,331,000 |  | $ 9,311,000
Accrued interest for held-to-maturity securities | 1,602,000 |  | $ 1,154,000
Consumer loans | Single-family residential |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Foreclosed residential real estate properties held as REO | 681,000 |  |
Real estate acquired through foreclosure | $ 6,281,000 |  |

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