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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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