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Allowance for Loan Losses - Additional Information (Detail)	3 Months Ended			12 Months Ended
	Mar. 31, 2022 USD ($) Loan SecurityLoan	Mar. 31, 2021 USD ($) SecurityLoan	Jun. 30, 2020 USD ($) Loan	Dec. 31, 2021 USD ($)
Accounts Notes And Loans Receivable [Line Items]
Period for calculating Loss migration rates of portfolio segments	3 years
Allowance for loan losses	$ 27,033,000			$ 26,641,000
Provision for loan losses	$ 300,000	$ 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
Defaulted loans | SecurityLoan	0	0
Impaired loans	greater than $350
Allowance for loan losses recorded for acquired loans	$ 0			0
Foreclosed assets	0			0
Residential Mortgage [Member]
Accounts Notes And Loans Receivable [Line Items]
Residential mortgages in process of foreclosure	437,000			293,000
Commercial and Agriculture [Member]
Accounts Notes And Loans Receivable [Line Items]
Provision for loan losses	(17,000)	$ (595,000)
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	$ 2,764,000
Number of loans modified | Loan	5
TDRs [Member]
Accounts Notes And Loans Receivable [Line Items]
Allowance for loan losses	$ 18,000			$ 18,000

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Carrying amount as of the balance sheet date of all assets obtained in full or partial satisfaction of a debt arrangement through foreclosure proceedings or defeasance; includes real and personal property; equity interests in corporations, partnerships, and joint ventures; and beneficial interests in trusts.

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