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Allowance for Loan Losses - Additional Information (Detail) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2022 USD ($) SecurityLoan | Jun. 30, 2021 USD ($) SecurityLoan | Jun. 30, 2020 USD ($) Loan | Jun. 30, 2022 USD ($) Loan SecurityLoan | Jun. 30, 2021 USD ($) SecurityLoan | Dec. 31, 2021 USD ($)
Schedule Of Accounts Notes Loans And Financing Receivable [Table] |  |  |  |  |  |
Period for calculating Loss migration rates of portfolio segments |  |  |  | 3 years |  |
Allowance for loan losses | $ 27,435,000 |  |  | $ 27,435,000 |  | $ 26,641,000
Provision for loan losses | 400,000 | $ 0 |  | $ 700,000 | $ 830,000 |
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 | $ 0 |  |  | 0 |  | 0
Residential Mortgage [Member] |  |  |  |  |  |
Schedule Of Accounts Notes Loans And Financing Receivable [Table] |  |  |  |  |  |
Residential mortgages in process of foreclosure | 416,000 |  |  | 416,000 |  | 293,000
Commercial and Agriculture [Member] |  |  |  |  |  |
Schedule Of Accounts Notes Loans And Financing Receivable [Table] |  |  |  |  |  |
Provision for loan losses | 203,000 | $ (43,000) |  | 186,000 | $ (638,000) |
Loans modified as troubled debt restructuring |  |  | $ 431,300,000 |  |  |
Number of loans modified | Loan |  |  | 813 |  |  |
Commercial and Agriculture [Member] | Additional 90 Day Modifications [Member] |  |  |  |  |  |
Schedule Of Accounts Notes Loans And Financing Receivable [Table] |  |  |  |  |  |
Loans modified as troubled debt restructuring |  |  | $ 124,400,000 |  |  |
Number of loans modified | Loan |  |  | 100 |  |  |
Commercial and Agriculture [Member] | Second Modifications [Member] |  |  |  |  |  |
Schedule Of Accounts Notes Loans And Financing Receivable [Table] |  |  |  |  |  |
Loans modified as troubled debt restructuring | 2,764,000 |  |  | $ 2,764,000 |  |
Number of loans modified | Loan |  |  |  | 5 |  |
TDRs [Member] |  |  |  |  |  |
Schedule Of Accounts Notes Loans And Financing Receivable [Table] |  |  |  |  |  |
Allowance for loan losses | $ 14,000 |  |  | $ 14,000 |  | $ 18,000

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