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Fair Value Measurements - Narrative (Details) - USD ($) |  | 6 Months Ended |
--- | --- | --- | ---
Mar. 01, 2024 | Mar. 31, 2024 | Mar. 31, 2023 | Sep. 30, 2023
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Available-for-sale securities purchased |  | $ 214,707,000 | $ 115,931,000 |
Proceeds from sales of available-for-sale securities |  | 176,402,000 | 0 |
Held-to-maturity securities purchased |  | 47,670,000 | 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 |  | $ 11,141,000 |  | $ 8,641,000
Accrued interest for held-to-maturity securities |  | 1,206,000 |  | $ 1,013,000
Luther Burbank |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Acquisition, investments purchased, AFS securities | $ 516,308,000 |  |  |
Acquisition, investments sold, AFS securities | 171,000,000 |  |  |
Acquisition, investments purchased, HTM securities | $ 2,570,000 |  |  |
Consumer loans | Single-family residential |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Foreclosed residential real estate properties held as REO |  | 28,000 |  |
Real estate acquired through foreclosure |  | $ 4,710,000 |  |

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