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Loans Receivable - Narrative (Details) | 9 Months Ended |
--- | --- | ---
Jun. 30, 2024 USD ($) portfolioSegment | Sep. 30, 2023 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of portfolio segments for loans held for investment | portfolioSegment | 2 |
Loans held for sale | $ 468,527,000 | $ 0
Accrued interest receivables for loans | 92,457,000 | 77,349,000
Gross loans | 22,466,841,000 | 19,648,504,000
Nonaccrual interest income recognized | 706,000 |
Impaired, interest income on accrual accrual and performed loans | 2,121,000 |
Loan modified, subsequent default | 0 |
Commercial loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross loans | 13,235,910,000 | 12,094,294,000
Commercial loans | Commercial & industrial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross loans | 2,394,978,000 | $ 2,321,717,000
Commercial loans | Commercial & industrial | 60 days past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loan modified, accumulated amortized cost | 0 |
Asset Pledged as Collateral | Federal Reserve Bank Advances |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross loans | $ 17,407,607,000 |

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