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Allowance for Losses on Loans - Additional Information (Details) - USD ($) | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Mar. 31, 2022 | Mar. 31, 2021 | Dec. 31, 2021 | Sep. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Provision (release) for credit losses | $ (500,000) | $ 0 | $ 0 | $ 3,000,000 |  |  |  |
Net (charge-offs) recoveries | 473,000 | 2,464,000 | 2,584,000 | 4,198,000 |  |  |  |
Allowance for credit losses on loans | 171,384,000 | 172,653,000 | 171,384,000 | 172,653,000 | $ 171,411,000 | $ 171,300,000 | $ 170,189,000 | $ 166,955,000
Gross loans | $ 15,266,310,000 |  | $ 15,266,310,000 |  |  | $ 14,004,870,000 |  |
% based on $, past due | 0.30% |  | 0.30% |  |  | 0.19% |  |
Financial Asset Originated |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Non-accrual loans | $ 33,639,000 |  | $ 33,639,000 |  |  | $ 31,749,000 |  |
Non-Performing Loans |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Gross loans | $ 47,243,000 |  | $ 47,243,000 |  |  | $ 43,625,000 |  |
Ratio of non-performing assets to total assets | 0.23% |  | 0.23% |  |  | 0.22% |  |
Commercial loans |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Allowance for credit losses on loans | $ 129,440,000 | 125,444,000 | $ 129,440,000 | 125,444,000 | 127,837,000 | $ 125,375,000 | 119,207,000 | 109,923,000
Gross loans | $ 9,106,457,000 |  | $ 9,106,457,000 |  |  | $ 8,316,591,000 |  |
% based on $, past due | 0.24% |  | 0.24% |  |  | 0.05% |  |
Commercial loans | Financial Asset Originated |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Non-accrual loans | $ 13,884,000 |  | $ 13,884,000 |  |  | $ 11,723,000 |  |
Commercial loans | Commercial & industrial |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Allowance for credit losses on loans | 53,903,000 | $ 47,794,000 | 53,903,000 | $ 47,794,000 | $ 47,231,000 | 45,957,000 | $ 44,317,000 | $ 38,665,000
Gross loans | $ 2,497,008,000 |  | $ 2,497,008,000 |  |  | $ 2,303,927,000 |  |
% based on $, past due | 0.62% |  | 0.62% |  |  | 0.01% |  |
Commercial loans | Commercial & industrial | Financial Asset Originated |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Non-accrual loans | $ 4,789,000 |  | $ 4,789,000 |  |  | $ 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 |  |
Loans receivable, net of allowance for loan losses | $ 109,746,000 |  | $ 109,746,000 |  |  | $ 305,162,000 |  |

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