Allowances for Loan Losses - Summary of Classes of the Loan Portfolio Summarized by the Internal Risk Rating System (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Loans and Leases Receivable Disclosure [Line Items]
Loans receivable	$ 715,039	$ 236,840
Agriculture Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans receivable	9,341	11,246
Commercial and PPP Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans receivable	122,378
Commercial Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans receivable		21,534
Commercial Real Estate Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans receivable	338,749	27,261
Residential Real Estate Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans receivable	231,302	167,536
Consumer Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans receivable	7,087	2,514
Municipal Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans receivable	6,182	6,749
Pass [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans receivable	701,348	235,997
Pass [Member] | Agriculture Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans receivable	9,341	11,246
Pass [Member] | Commercial and PPP Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans receivable	117,918
Pass [Member] | Commercial Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans receivable		21,259
Pass [Member] | Commercial Real Estate Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans receivable	332,156	27,261
Pass [Member] | Residential Real Estate Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans receivable	228,664	166,968
Pass [Member] | Consumer Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans receivable	7,087	2,514
Pass [Member] | Municipal Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans receivable	6,182	6,749
Special Mention [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans receivable	7,491	0
Special Mention [Member] | Agriculture Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans receivable	0	0
Special Mention [Member] | Commercial and PPP Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans receivable	3,757
Special Mention [Member] | Commercial Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans receivable		0
Special Mention [Member] | Commercial Real Estate Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans receivable	2,077	0
Special Mention [Member] | Residential Real Estate Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans receivable	1,657	0
Special Mention [Member] | Consumer Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans receivable	0	0
Special Mention [Member] | Municipal Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans receivable	0	0
Substandard [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans receivable	6,200	843
Substandard [Member] | Agriculture Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans receivable	0	0
Substandard [Member] | Commercial and PPP Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans receivable	703
Substandard [Member] | Commercial Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans receivable		275
Substandard [Member] | Commercial Real Estate Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans receivable	4,516	0
Substandard [Member] | Residential Real Estate Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans receivable	981	568
Substandard [Member] | Consumer Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans receivable	0	0
Substandard [Member] | Municipal Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans receivable	0	0
Doubtful [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans receivable	0	0
Doubtful [Member] | Agriculture Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans receivable	0	0
Doubtful [Member] | Commercial and PPP Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans receivable	0
Doubtful [Member] | Commercial Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans receivable		0
Doubtful [Member] | Commercial Real Estate Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans receivable	0	0
Doubtful [Member] | Residential Real Estate Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans receivable	0	0
Doubtful [Member] | Consumer Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans receivable	0	0
Doubtful [Member] | Municipal Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans receivable	$ 0	$ 0