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Loans - Additional Information (Detail) | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2022 USD ($) Loan | Jun. 30, 2021 USD ($) | Jun. 30, 2022 USD ($) | Jun. 30, 2021 USD ($) | Dec. 31, 2021 USD ($) Loan | Mar. 31, 2022 USD ($) | Mar. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Accrued interest on loans | $ 14,044,000 |  | $ 14,044,000 |  | $ 11,976,000 |  |  |
Loans | 5,655,402,000 |  | 5,655,402,000 |  | 5,151,541,000 |  |  |
Loans held for sale, at the lower of cost or fair value | 18,528,000 | $ 36,030,000 | 18,528,000 | $ 36,030,000 | 13,342,000 | $ 15,617,000 | $ 32,674,000 | $ 8,568,000
Gains on sale of second draw PPP loans |  |  | 5,295,000 | 7,633,000 |  |  |  |
Proceeds from sale of second draw PPP loans | 41,937,000 | 35,760,000 | 71,514,000 | 53,833,000 |  |  |  |
Interest income on nonaccrual loans | 9,000 | 136,000 | 36,000 | 287,000,000,000 |  |  |  |
TDR loans receivable | 2,300,000 |  | $ 2,300,000 |  | $ 2,900,000 |  |  |
Loans default payment past due period |  |  | 30 days |  |  |  |  |
Total recorded investment | $ 91,000 |  | $ 91,000 |  |  |  |  |
Number of loans defaulted | Loan | 0 |  |  |  | 0 |  |  |
Loans Pledged to Secure Advances |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans | $ 2,450,000,000 |  | 2,450,000,000 |  | $ 2,300,000,000 |  |  |
Payment Protection Program |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans | 1,100,000 |  | 1,100,000 |  | 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 | 18,500,000 |  | 18,500,000 |  | 13,300,000 |  |  |
PPP Loans |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Gains on sale of second draw PPP loans |  | 200,000 |  | 2,700,000 |  |  |  |
Proceeds from sale of second draw PPP loans |  | $ 9,500,000 |  | $ 118,100,000 |  |  |  |
Loans | Accrued Interest |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Accrued interest on loans | $ 12,000,000.0 |  | $ 12,000,000.0 |  | $ 10,100,000 |  |  |

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