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v3.21.2

Allowance for Loan Losses - Additional Information (Detail) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 USD ($) SecurityLoan | Sep. 30, 2020 USD ($) SecurityLoan | Jun. 30, 2020 USD ($) Loan | Sep. 30, 2021 USD ($) Loan SecurityLoan | Sep. 30, 2020 USD ($) SecurityLoan | Dec. 31, 2020 USD ($)
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Period for calculating Loss migration rates of portfolio segments |  |  |  | 3 years |  |
Allowance for loan losses | $ 26,568,000 |  |  | $ 26,568,000 |  | $ 25,028,000
Provision for loan losses | 0 | $ 2,250,000 |  | $ 830,000 | $ 7,862,000 |
Percentage of eligible paycheck protection program loan |  |  |  |  | 100.00% |
Number of days past due for loans to be considered as nonperforming |  |  |  | 90 days |  |
Reasonable period for nonperforming TDRs to be returned to performing status |  |  |  | 6 months |  |
Number of days reaching where loans are considered for nonaccrual status |  |  |  | 90 days |  |
Conditions where loans are considered for nonaccrual status |  |  |  | A loan may be returned to accruing status only if one of three conditions are met: the loan is well-secured and none of the principal and interest has been past due for a minimum of 90 days; the loan is a TDR and has made a minimum of six months payments; or the principal and interest payments are reasonably assured and a sustained period of performance has occurred, generally six months. |  |
Loans modified as troubled debt restructuring | $ 0 | $ 0 |  | $ 0 | $ 0 |
Defaulted loans | SecurityLoan | 0 | 0 |  | 0 | 0 |
Impaired loans |  |  |  | greater than $350 |  |
Allowance for loan losses recorded for acquired loans |  |  |  | $ 0 |  | 0
Foreclosed assets | $ 26 |  |  | 26 |  | 31,000
Residential Mortgage [Member] |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Residential mortgages in process of foreclosure | 296,000 |  |  | 296,000 |  | 741,000
Commercial and Agriculture [Member] |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Provision for loan losses | 191,000 | $ (139,000) |  | (447,000) | $ 452,000 |
Loans modified as troubled debt restructuring |  |  | $ 431,300,000 |  |  |
Number of loans modified | Loan |  |  | 813 |  |  |
Commercial and Agriculture [Member] | Additional 90 Day Modifications [Member] |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Loans modified as troubled debt restructuring |  |  | $ 124,400,000 |  |  |
Number of loans modified | Loan |  |  | 100 |  |  |
Commercial and Agriculture [Member] | Second Modifications [Member] |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Loans modified as troubled debt restructuring | 18,787,000 |  |  | $ 18,787,000 |  |
Number of loans modified | Loan |  |  |  | 18 |  |
TDRs [Member] |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | $ 73,000 |  |  | $ 73,000 |  | $ 35,000

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