Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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Amount of deferred interest and fee income, unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of acquired loans. Excludes amounts for loans and leases covered under loss sharing agreements.

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Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

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Loans Receivable - Summary of Portfolio Segments and Classes of Loans (Detail) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021	Dec. 31, 2020
Loans and Leases Receivable Disclosure [Line Items]
Loans receivable	$ 731,080	$ 715,039
Deferred fees	(19)	(223)
Allowance for loan losses	(3,443)	(3,152)	$ (2,787)	$ (2,789)
Total	727,618	711,664
Paycheck Protection Program ("PPP") Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans receivable	10,586	23,774
Agriculture Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans receivable	8,111	9,341
Commercial Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans receivable	94,114	98,604
Commercial Real Estate Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans receivable	353,559	338,749
Residential Real Estate Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans receivable	252,158	231,302
Consumer and Other Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans receivable	6,359	7,087
Municipal Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans receivable	$ 6,193	$ 6,182