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Allowance for Losses on Loans - Additional Information (Details) - USD ($) | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Sep. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Provision (release) for credit losses | $ 10,800,000 |  |  | $ 0 | $ 15,250,000 | $ 250,000 |  |  |
Net (charge-offs) recoveries | (1,702,000) | $ 1,788,000 | $ 2,579,000 | 936,000 | 2,665,000 | 3,515,000 |  |  |
Allowance for credit losses on loans | 165,349,000 | 157,101,000 | 147,513,000 | 134,022,000 | 165,349,000 | 134,022,000 | $ 131,534,000 | $ 133,086,000 | $ 129,257,000
SBA Payroll Protection Program loans | 14,301,358,000 |  |  |  | 14,301,358,000 |  | 13,312,388,000 |  |
Gross loans | $ 12,898,775,000 |  |  |  | $ 12,898,775,000 |  | $ 13,312,388,000 |  |
% based on $, past due | 0.32% |  |  |  | 0.32% |  | 0.29% |  |
Non-accrual loans |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Non-accrual loans |  |  |  |  |  |  | $ 33,731,000 |  |
Non-Performing Loans |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Gross loans | $ 44,630,000 |  |  |  | $ 44,630,000 |  | $ 43,826,000 |  |
Ratio of non-performing assets to total assets | 0.25% |  |  |  | 0.25% |  | 0.27% |  |
Commercial loans |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Allowance for credit losses on loans | $ 106,408,000 | 98,704,000 | 89,581,000 | 94,803,000 | $ 106,408,000 | 94,803,000 | $ 93,470,000 | 93,546,000 | 88,178,000
SBA Payroll Protection Program loans | 7,900,191,000 |  |  |  | 7,900,191,000 |  | 6,564,698,000 |  |
Gross loans | $ 6,836,049,000 |  |  |  | $ 6,836,049,000 |  | $ 6,564,698,000 |  |
% based on $, past due | 0.15% |  |  |  | 0.15% |  | 0.12% |  |
Commercial loans | Commercial & industrial |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Allowance for credit losses on loans | $ 42,179,000 | $ 38,576,000 | $ 33,676,000 | $ 31,071,000 | $ 42,179,000 | $ 31,071,000 | $ 31,450,000 | $ 30,574,000 | $ 28,702,000
SBA Payroll Protection Program loans | 2,158,000,000 |  |  |  | 2,158,000,000 |  | 1,268,695,000 |  |
Gross loans | $ 2,138,462,000 |  |  |  | $ 2,138,462,000 |  | $ 1,268,695,000 |  |
% based on $, past due | 0.17% |  |  |  | 0.17% |  | 0.07% |  |
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 |  |  |  |
SBA Payroll Protection Program loans | $ 758,955,000 |  |  |  | $ 758,955,000 |  |  |  |

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