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Loans - Additional Information (Detail) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Accrued interest on loans | $ 11,943,000 |  | $ 11,943,000 |  | $ 16,363,000 |  |  |
PPP loans | 4,858,865,000 |  | 4,858,865,000 |  | 4,880,168,000 |  |  |
Loans pledged to secure advances | 2,170,000,000 |  | 2,170,000,000 |  | 2,170,000,000 |  |  |
Loans held for sale, at the lower of cost or fair value | 17,881,000 | $ 12,834,000 | 17,881,000 | $ 12,834,000 | 8,568,000 | $ 36,030,000 | $ 17,942,000 | $ 6,020,000
Gains on sale of second draw PPP loans |  |  | 13,475,000 | 3,478,000 |  |  |  |
Proceeds from sale of second draw PPP loans | 62,469,000 | $ 29,260,000 | 225,223,000 | $ 47,472,000 |  |  |  |
TDR loans receivable | 11,300,000 |  | $ 11,300,000 |  | 25,000,000.0 |  |  |
Principal and interest due |  |  | 3 months |  |  |  |  |
Loans default payment past due period |  |  | 30 days |  |  |  |  |
Total recorded investment | 0 |  | $ 0 |  | 398,000 |  |  |
30-59 Days Past Due |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans Modified under provision of CARES Act, current | 306,000 |  | 306,000 |  |  |  |  |
60-89 Days Past Due |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans Modified under provision of CARES Act, current | 0 |  | 0 |  |  |  |  |
90 Days or More Past Due |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans Modified under provision of CARES Act, current | 94,000 |  | 94,000 |  |  |  |  |
Pass/Pass-Watch |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
PPP loans | 4,645,863,000 |  | 4,645,863,000 |  | 4,663,021,000 |  |  |
Special Mention |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
PPP loans | 130,565,000 |  | 130,565,000 |  | 76,978,000 |  |  |
Classified |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
PPP loans | 82,437,000 |  | 82,437,000 |  | 140,169,000 |  |  |
Payment Protection Program |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans Modified under provision of CARES Act |  |  | 12,000,000.0 |  | 155,600,000 |  |  |
Loans Modified under provision of CARES Act, current | 12,000,000.0 |  | 12,000,000.0 |  | 155.6 |  |  |
Payment Protection Program | 30-59 Days Past Due |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans previously modified under provision of CARES Act |  |  | 4,400,000 |  | 4,900,000 |  |  |
Payment Protection Program | 60-89 Days Past Due |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans previously modified under provision of CARES Act |  |  | 900,000 |  | 1,700,000 |  |  |
Payment Protection Program | 90 Days or More Past Due |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans previously modified under provision of CARES Act |  |  | 2,200,000 |  | 13,900,000 |  |  |
Payment Protection Program | Pass/Pass-Watch |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans Modified under provision of CARES Act |  |  | 2,600,000 |  | 99,900,000 |  |  |
Payment Protection Program | Special Mention |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans Modified under provision of CARES Act |  |  | 6,400,000 |  | 31,300,000 |  |  |
Payment Protection Program | Classified |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans Modified under provision of CARES Act |  |  | 3,000,000.0 |  | 24,400,000 |  |  |
SBA Loans |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans held for sale, at the lower of cost or fair value | 17,900,000 |  | 17,900,000 |  | 8,600,000 |  |  |
PPP Loans |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Gains on sale of second draw PPP loans | 339,000 |  | 3,000,000.0 |  |  |  |  |
Proceeds from sale of second draw PPP loans | 14,600,000 |  | 132,700,000 |  |  |  |  |
Accrued Interest | Payment Protection Program |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
PPP loans | 21,900,000 |  | 21,900,000 |  | 295,700,000 |  |  |
Modified Loans | Payment Protection Program |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans Modified under provision of CARES Act |  |  | 12,000,000.0 |  | 155,600,000 |  |  |
Loans | Accrued Interest |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Accrued interest on loans | 10,200,000 |  | 10,200,000 |  | 15,200,000 |  |  |
Unpaid deferred interest receivable related to loans modified under CARES Act | 3,600,000 |  | 3,600,000 |  | 7,500,000 |  |  |
Unpaid deferred interest receivable related to loans modified under CARES Act, net of valuation allowance | $ 311,000 |  | $ 311,000 |  | $ 1,700,000 |  |  |

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