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Allowance for Loan Losses - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Provision for credit losses | $ 17,500 | $ 41,500 | $ 3,000
Allowance for credit loss, charge-off (recovery) | 1,356 | 45,101 |
Allowance for loan losses | 203,753 | 177,207 | $ 172,808
Loans Subject to Quantitative Evaluation |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Allowance for loan losses | 144,848 |  |
Loans Subject to Management Qualitative Evaluation |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Allowance for loan losses | 58,905 |  |
Non-Performing Loans |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Financing receivable, gross | $ 77,418 | $ 57,924 |
Ratio of non-performing assets to total assets | 0.28% | 0.26% |
Financial Asset Originated |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Non-accrual | $ 69,541 | $ 50,422 |

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- Definition Amount, excluding accrued interest, of decrease (increase) in allowance for credit loss on financing receivable from writeoff (recovery). Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13 + Details
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