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Allowance for Loan Losses - Schedule of Loan Modifications (Detail) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 USD ($) Loan | Sep. 30, 2021 USD ($) Loan | Sep. 30, 2020 USD ($)
Financing Receivable Modifications [Line Items] |  |  |
Loans modified as troubled debt restructuring |  | $ 0 | $ 0
Second Modifications [Member] | CARES Act [Member] |  |  |
Financing Receivable Modifications [Line Items] |  |  |
Number of loans modified | Loan |  | 18 |
Loans modified as troubled debt restructuring |  | $ 18,787,000 |
Percent of Loans Outstanding |  | 0.94% |
Commercial and Agriculture [Member] |  |  |
Financing Receivable Modifications [Line Items] |  |  |
Number of loans modified | Loan | 813 |  |
Loans modified as troubled debt restructuring | $ 431,300,000 |  |
Commercial and Agriculture [Member] | Second Modifications [Member] |  |  |
Financing Receivable Modifications [Line Items] |  |  |
Number of loans modified | Loan |  | 18 |
Loans modified as troubled debt restructuring |  | $ 18,787,000 |
Commercial and Agriculture [Member] | Second Modifications [Member] | CARES Act [Member] |  |  |
Financing Receivable Modifications [Line Items] |  |  |
Number of loans modified | Loan |  | 6 |
Loans modified as troubled debt restructuring |  | $ 1,571,000 |
Percent of Loans Outstanding |  | 0.08% |
Commercial Real Estate Owner Occupied [Member] | Second Modifications [Member] | CARES Act [Member] |  |  |
Financing Receivable Modifications [Line Items] |  |  |
Number of loans modified | Loan |  | 2 |
Loans modified as troubled debt restructuring |  | $ 2,591,000 |
Percent of Loans Outstanding |  | 0.13% |
Commercial Real Estate Non Owner Occupied [Member] | Second Modifications [Member] | CARES Act [Member] |  |  |
Financing Receivable Modifications [Line Items] |  |  |
Number of loans modified | Loan |  | 9 |
Loans modified as troubled debt restructuring |  | $ 14,174,000 |
Percent of Loans Outstanding |  | 0.71% |
Real Estate Construction [Member] | Second Modifications [Member] | CARES Act [Member] |  |  |
Financing Receivable Modifications [Line Items] |  |  |
Number of loans modified | Loan |  | 1 |
Loans modified as troubled debt restructuring |  | $ 451,000 |
Percent of Loans Outstanding |  | 0.02% |

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