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Loans - Additional Information (Detail) | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2020 USD ($) Loan | Sep. 30, 2021 USD ($) Employee Contract | Dec. 31, 2020 USD ($) Loan | Dec. 27, 2020 USD ($) | Sep. 30, 2020 USD ($)
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Total Loans |  | $ 2,004,814,000 | $ 2,057,502,000 |  |
Net deferred loan fees |  | 4,444,000 | 5,998,000 |  |
Loans processed |  | 0 |  |  | $ 0
Paycheck Protection Program Loans [Member] |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Net deferred loan fees |  | $ 3,340,000 | $ 5,194,000 |  |
Number of loans processed |  | 1,340 | 2,300 |  |
Loans processed |  | $ 131,109,000 | $ 268,300,000 | $ 284,500,000,000 |
Number of employees | Employee |  | 300 |  |  |
Percentage of reduction in gross revenues |  | 25.00% |  |  |
Maximum of monthly payroll allowable amount |  | $ 2,000,000 |  |  |
Commercial and Agriculture [Member] |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Total Loans |  | 276,741,000 | 409,876,000 |  |
Number of loans processed | Loan | 813 |  |  |  |
Loans processed | $ 431,300,000 |  |  |  |
Commercial and Agriculture [Member] | Paycheck Protection Program Loans [Member] |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Total Loans |  | $ 83,287,000 | $ 217,295,000 |  |

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