Allowances for Loan Losses - Summary of Classes of the Loan Portfolio Summarized by the Internal Risk Rating System (Detail) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Gross	$ 863,984	$ 715,039
Agriculture Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Gross	13,977	9,341
Commercial and PPP Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Gross	98,475	122,378
Commercial Real Estate Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Gross	482,367	338,749
Residential Real Estate Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Gross	251,832	231,302
Consumer Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Gross	11,929	7,087
Municipal Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Gross	5,404	6,182
Pass [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Gross	845,659	701,348
Pass [Member] | Agriculture Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Gross	13,877	9,341
Pass [Member] | Commercial and PPP Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Gross	93,894	117,918
Pass [Member] | Commercial Real Estate Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Gross	474,045	332,156
Pass [Member] | Residential Real Estate Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Gross	246,512	228,664
Pass [Member] | Consumer Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Gross	11,927	7,087
Pass [Member] | Municipal Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Gross	5,404	6,182
Special Mention [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Gross	5,311	7,491
Special Mention [Member] | Agriculture Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Gross	0	0
Special Mention [Member] | Commercial and PPP Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Gross	2,195	3,757
Special Mention [Member] | Commercial Real Estate Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Gross	1,694	2,077
Special Mention [Member] | Residential Real Estate Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Gross	1,422	1,657
Special Mention [Member] | Consumer Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Gross	0	0
Special Mention [Member] | Municipal Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Gross	0	0
Substandard [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Gross	11,066	6,200
Substandard [Member] | Agriculture Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Gross	100	0
Substandard [Member] | Commercial and PPP Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Gross	2,386	703
Substandard [Member] | Commercial Real Estate Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Gross	4,680	4,516
Substandard [Member] | Residential Real Estate Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Gross	3,898	981
Substandard [Member] | Consumer Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Gross	2	0
Substandard [Member] | Municipal Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Gross	0	0
Doubtful [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Gross	1,948	0
Doubtful [Member] | Agriculture Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Gross	0	0
Doubtful [Member] | Commercial and PPP Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Gross	0	0
Doubtful [Member] | Commercial Real Estate Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Gross	1,948	0
Doubtful [Member] | Residential Real Estate Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Gross	0	0
Doubtful [Member] | Consumer Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Gross	0	0
Doubtful [Member] | Municipal Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Gross	$ 0	$ 0