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Loans - Additional Information (Detail)	9 Months Ended	12 Months Ended
	Sep. 30, 2022 USD ($)	Dec. 31, 2021 USD ($) Loan	Dec. 31, 2020 USD ($) Loan	Sep. 30, 2021 USD ($)
Accounts Notes And Loans Receivable [Line Items]
Total Loans	$ 2,328,614,000	$ 1,997,879,000
Net deferred loan fees	1,741,000	2,924,000
Loans processed	0			$ 0
Paycheck Protection Program Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Net deferred loan fees	38,000	$ 1,762,000
Number of loans processed | Loan		3,600	3,600
Loans processed		$ 399,400,000	$ 399,400,000
Loans forgiven or paid off	398,400,000
Loans recognized fees in income	1,700,000
Unearned fees remain	38,000
Commercial and Agriculture [Member]
Accounts Notes And Loans Receivable [Line Items]
Total Loans	227,387,000	246,502,000
Commercial and Agriculture [Member] | Paycheck Protection Program Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Total Loans	$ 819,000	$ 43,209,000

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