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Loans - Additional Information (Detail) | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2022 USD ($) Loan | Sep. 30, 2021 USD ($) | Sep. 30, 2022 USD ($) Loan | Sep. 30, 2021 USD ($) | Dec. 31, 2021 USD ($) Loan | Jun. 30, 2022 USD ($) | Jun. 30, 2021 USD ($) | Dec. 31, 2020 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Accrued interest on loans | $ 15,356,000 |  | $ 15,356,000 |  | $ 11,976,000 |  |  |
Loans | 5,800,991,000 |  | 5,800,991,000 |  | 5,151,541,000 |  |  |
Loans held for sale, at the lower of cost or fair value | 10,044,000 | $ 17,881,000 | 10,044,000 | $ 17,881,000 | 13,342,000 | $ 18,528,000 | $ 36,030,000 | $ 8,568,000
Gains on sale of second draw PPP loans |  |  | 7,545,000 | 13,475,000 |  |  |  |
Proceeds from sale of second draw PPP loans | 43,685,000 | 62,469,000 | 115,199,000 | 225,223,000 |  |  |  |
Interest income on nonaccrual loans | 0 | 0 | 0 | 0 |  |  |  |
TDR loans receivable | $ 1,600,000 |  | $ 1,600,000 |  | $ 2,900,000 |  |  |
Loans default payment past due period |  |  | 30 days |  |  |  |  |
Number of loans defaulted | Loan | 0 |  | 0 |  | 0 |  |  |
Loans Pledged to Secure Advances |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans | $ 2,360,000,000 |  | $ 2,360,000,000 |  | $ 2,300,000,000 |  |  |
Payment Protection Program |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans | 1,000,000.0 |  | 1,000,000.0 |  | 3,000,000.0 |  |  |
SBA Loans |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans held for sale, at the lower of cost or fair value | 10,000,000.0 |  | 10,000,000.0 |  | 13,300,000 |  |  |
PPP Loans |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Gains on sale of second draw PPP loans |  | 300,000 |  | 3,000,000.0 |  |  |  |
Proceeds from sale of second draw PPP loans |  | $ 14,600,000 |  | $ 132,700,000 |  |  |  |
Loans | Accrued Interest |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Accrued interest on loans | $ 13,200,000 |  | $ 13,200,000 |  | $ 10,100,000 |  |  |

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