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Allowance for Losses on Loans - Additional Information (Details) - USD ($) | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Mar. 31, 2022 | Sep. 30, 2021 | Mar. 31, 2021 | Sep. 30, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Provisions & Transfers | $ (1,000,000) | $ (3,000,000) | $ (3,500,000) | $ (1,500,000) |  |  |  |
Net (charge-offs) recoveries | 595,000 | 1,131,000 | 3,179,000 | 5,329,000 |  |  |  |
Allowance for credit losses on loans | 170,979,000 | 170,784,000 | 170,979,000 | 170,784,000 | $ 171,384,000 | $ 171,300,000 | $ 172,653,000 | $ 166,955,000
Net loans | 15,565,165,000 |  | 15,565,165,000 |  |  | 13,833,570,000 |  |
Gross loans | $ 15,736,144,000 |  | $ 15,736,144,000 |  |  | $ 14,004,870,000 |  |
% based on $, past due | 0.26% |  | 0.26% |  |  | 0.19% |  |
Financial Asset Originated |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Non-accrual loans | $ 36,679,000 |  | $ 36,679,000 |  |  | $ 31,749,000 |  |
Non-Performing Loans |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Gross loans | $ 50,430,000 |  | $ 50,430,000 |  |  | $ 43,625,000 |  |
Ratio of non-performing assets to total assets | 0.25% |  | 0.25% |  |  | 0.22% |  |
Commercial loans |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Provisions & Transfers | $ 1,405,000 | (2,421,000) | $ 3,837,000 | 10,368,000 |  |  |  |
Allowance for credit losses on loans | 130,859,000 | 123,519,000 | 130,859,000 | 123,519,000 | 129,440,000 | $ 125,375,000 | 125,444,000 | 109,923,000
Gross loans | $ 9,330,158,000 |  | $ 9,330,158,000 |  |  | $ 8,316,591,000 |  |
% based on $, past due | 0.18% |  | 0.18% |  |  | 0.05% |  |
Commercial loans | Financial Asset Originated |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Non-accrual loans | $ 15,256,000 |  | $ 15,256,000 |  |  | $ 11,723,000 |  |
Commercial loans | Commercial & industrial |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Provisions & Transfers | 1,040,000 | (2,258,000) | 9,838,000 | 6,830,000 |  |  |  |
Allowance for credit losses on loans | 54,924,000 | $ 45,538,000 | 54,924,000 | $ 45,538,000 | $ 53,903,000 | 45,957,000 | $ 47,794,000 | $ 38,665,000
Gross loans | $ 2,344,046,000 |  | $ 2,344,046,000 |  |  | $ 2,303,927,000 |  |
% based on $, past due | 0.70% |  | 0.70% |  |  | 0.01% |  |
Commercial loans | Commercial & industrial | Financial Asset Originated |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Non-accrual loans | $ 4,288,000 |  | $ 4,288,000 |  |  | $ 365,000 |  |
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 |  |  | 0 |  |
Net loans | $ 54,185,000 |  | $ 54,185,000 |  |  | $ 305,162,000 |  |

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