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v3.21.1

Allowance for Losses on Loans - Additional Information (Details) - USD ($) | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020 | Sep. 30, 2020 | Dec. 31, 2019 | Sep. 30, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Provision (release) for credit losses | $ 0 | $ 8,200,000 | $ 3,000,000 | $ 4,450,000 |  |  |  |
Net (charge-offs) recoveries | 2,464,000 | 1,788,000 | 4,198,000 | 4,367,000 |  |  |  |
Allowance for credit losses on loans | 172,653,000 | 157,101,000 | 172,653,000 | 157,101,000 | $ 170,189,000 | $ 166,955,000 | $ 147,513,000 | $ 149,284,000
Loans receivable, net of allowance for loan losses | 13,035,423,000 |  | 13,035,423,000 |  |  | 12,792,317,000 |  |
Gross PPP loans | 15,265,588,000 |  | 15,265,588,000 |  |  | 14,467,722,000 |  |
Gross loans | $ 13,208,075,000 |  | $ 13,208,075,000 |  |  | $ 12,959,272,000 |  |
% based on $, past due | 0.29% |  | 0.29% |  |  | 0.24% |  |
Financial Asset Originated |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Non-accrual loans | $ 39,955,000 |  | $ 39,955,000 |  |  | $ 29,056,000 |  |
Non-Performing Loans |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Gross loans | $ 48,943,000 |  | $ 48,943,000 |  |  | $ 37,695,000 |  |
Ratio of non-performing assets to total assets | 0.25% |  | 0.25% |  |  | 0.20% |  |
Commercial loans |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Allowance for credit losses on loans | $ 125,444,000 | 98,704,000 | $ 125,444,000 | 98,704,000 | 119,207,000 | $ 109,923,000 | 89,581,000 | 89,335,000
Gross PPP loans | 9,387,560,000 |  | 9,387,560,000 |  |  | 8,163,029,000 |  |
Gross loans | $ 7,726,098,000 |  | $ 7,726,098,000 |  |  | $ 7,044,426,000 |  |
% based on $, past due | 0.14% |  | 0.14% |  |  | 0.04% |  |
Commercial loans | Financial Asset Originated |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Non-accrual loans | $ 13,821,000 |  | $ 13,821,000 |  |  | $ 5,769,000 |  |
Commercial loans | Commercial & industrial |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Allowance for credit losses on loans | 47,794,000 | $ 38,576,000 | 47,794,000 | $ 38,576,000 | $ 44,317,000 | 38,665,000 | $ 33,676,000 | $ 32,235,000
Gross PPP loans | 2,471,823,000 |  | 2,471,823,000 |  |  | 2,132,160,000 |  |
Gross loans | $ 2,452,585,000 |  | $ 2,452,585,000 |  |  | $ 2,115,513,000 |  |
% based on $, past due | 0.08% |  | 0.08% |  |  | 0.04% |  |
Commercial loans | Commercial & industrial | Financial Asset Originated |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Non-accrual loans | $ 832,000 |  | $ 832,000 |  |  | $ 329,000 |  |
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 | 695,752,000 |  | 695,752,000 |  |  | 745,081,000 |  |
Gross PPP loans | $ 711,405,000 |  | $ 711,405,000 |  |  | $ 762,004,000 |  |

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