Loans Receivable - Summary of Portfolio Segments and Classes of Loans (Detail) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2021
Loans and Leases Receivable Disclosure [Line Items]
Loans receivable	$ 978,475	$ 927,615
Deferred costs (fees)	(437)	(256)
Allowance for credit losses	(9,964)	(4,666)	$ (4,569)	$ (3,890)	$ (3,152)
Net loans	968,948	923,205
Agriculture And Farmland Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans receivable	50,584	55,746
Allowance for credit losses		(279)
Construction [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans receivable	65,836	57,713
Allowance for credit losses		(274)
Commercial And Industrial Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans receivable	115,572	104,755
Consumer and Other Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans receivable	11,869	10,057
Municipal Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans receivable	4,137	5,466
Allowance for credit losses		(12)
Multifamily [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans receivable	111,853	105,390
Allowance for credit losses		(480)
Owner Occupied [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans receivable	160,929	139,554
Allowance for credit losses		(635)
Non-owner Occupied [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans receivable	257,344	245,274
Allowance for credit losses		(1,116)
First Liens [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans receivable	172,481	168,084
Allowance for credit losses		(1,029)
Second Liens and Lines of Credit [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans receivable	$ 27,870	35,576
Allowance for credit losses		$ (218)