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Allowance for Losses on Loans - Additional Information (Details) - USD ($) | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Mar. 31, 2023 | Sep. 30, 2022 | Mar. 31, 2022 | Sep. 30, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Provision (release) for credit losses | $ 9,000,000 | $ 1,500,000 | $ 15,000,000 | $ 1,500,000 |  |  |  |
Net charge-offs | 10,351,000 | (595,000) | 15,739,000 | (3,179,000) |  |  |  |
Allowance for credit losses on loans | 178,069,000 | 170,979,000 | 178,069,000 | 170,979,000 | $ 177,420,000 | $ 172,808,000 | $ 171,384,000 | $ 171,300,000
Net loans | 17,384,188,000 |  | 17,384,188,000 |  |  | 16,113,564,000 |  |
Gross loans | $ 17,562,257,000 |  | $ 17,562,257,000 |  |  | $ 16,286,372,000 |  |
% based on $, past due | 0.31% |  | 0.31% |  |  | 0.17% |  |
Financial Asset Originated |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Non-accrual loans | $ 55,276,000 |  | $ 55,276,000 |  |  | $ 34,534,000 |  |
Non-Performing Loans |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Gross loans | $ 67,000,000 |  | $ 67,000,000 |  |  | $ 44,554,000 |  |
Ratio of non-performing assets to total assets | 0.30% |  | 0.30% |  |  | 0.21% |  |
Commercial loans |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Allowance for credit losses on loans | $ 138,185,000 | 130,859,000 | $ 138,185,000 | 130,859,000 | 137,665,000 | $ 133,476,000 | 129,440,000 | 125,375,000
Gross loans | $ 10,488,716,000 |  | $ 10,488,716,000 |  |  | $ 9,728,501,000 |  |
% based on $, past due | 0.32% |  | 0.32% |  |  | 0.08% |  |
Commercial loans | Financial Asset Originated |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Non-accrual loans | $ 38,724,000 |  | $ 38,724,000 |  |  | $ 16,296,000 |  |
Commercial loans | Commercial & industrial |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Allowance for credit losses on loans | 61,915,000 | 54,924,000 | 61,915,000 | 54,924,000 | $ 63,301,000 | 57,210,000 | $ 53,903,000 | $ 45,957,000
Gross loans | $ 2,490,740,000 |  | $ 2,490,740,000 |  |  | $ 2,343,403,000 |  |
% based on $, past due | 1.31% |  | 1.31% |  |  | 0.28% |  |
Commercial loans | Commercial & industrial | SBA Payroll Protection Program, CARES Act |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Allowance for credit losses on loans |  | 0 |  | 0 |  |  |  |
Net loans |  | $ 54,185,000 |  | $ 54,185,000 |  |  |  |
Commercial loans | Commercial & industrial | Financial Asset Originated |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Non-accrual loans | $ 31,686,000 |  | $ 31,686,000 |  |  | $ 5,693,000 |  |

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