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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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