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Loans - Additional Information (Detail) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 Contract | Dec. 31, 2021 USD ($) Employee Loan | Dec. 31, 2020 USD ($) Loan | Dec. 31, 2019 Contract | Dec. 27, 2020 USD ($)
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Total loans |  | $ 1,997,879 | $ 2,057,502 |  |
Net deferred loan fees |  | 2,924 | 5,998 |  |
Number of loans processed | Contract |  |  |  | 1 |
Loans processed |  | 0 | 0 |  |
Loans and Leases Receivable, Net Amount |  | 1,971,238 | 2,032,474 |  |
Paycheck Protection Program Loans [Member] |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Net deferred loan fees |  | $ 1,762 | $ 5,194 |  |
Number of loans processed | Loan |  | 1,340 | 2,300 |  |
Loans processed |  | $ 131,109 | $ 268,300 |  | $ 284,500,000
Number of employees | Employee |  | 300 |  |  |
Percentage of reduction in gross revenues |  | 25.00% |  |  |
Maximum of monthly payroll allowable amount |  | $ 2,000 |  |  |
Loans and Leases Receivable, Net Amount |  | 6,115 | 6,986 |  |
Commercial and Agriculture [Member] |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Total loans |  | 246,502 | 409,876 |  |
Number of loans processed | Contract | 813 |  |  |  |
Loans processed |  |  | 431,300 |  |
Commercial and Agriculture [Member] | Paycheck Protection Program Loans [Member] |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Total loans |  | $ 43,209 | $ 217,295 |  |

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