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Loans - Additional Information (Detail)	3 Months Ended		12 Months Ended
	Mar. 31, 2022 USD ($)	Jun. 30, 2020 USD ($) Loan	Dec. 31, 2021 USD ($) Loan	Dec. 31, 2020 USD ($) Loan	Mar. 31, 2021 USD ($)
Accounts Notes And Loans Receivable [Line Items]
Total Loans	$ 2,018,188,000		$ 1,997,879,000
Net deferred loan fees	1,849,000		2,924,000
Loans processed	0				$ 0
Paycheck Protection Program Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Net deferred loan fees	583,000		$ 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	383,900,000
Loans recognized fees in income	1,200,000
Unearned fees remain	583,000
Commercial and Agriculture [Member]
Accounts Notes And Loans Receivable [Line Items]
Total Loans	218,443,000		246,502,000
Number of loans processed | Loan		813
Loans processed		$ 431,300,000
Commercial and Agriculture [Member] | Paycheck Protection Program Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Total Loans	$ 15,529,000		$ 43,209,000

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