Loans Receivable - Summary of Portfolio Segments and Classes of Loans (Detail) - USD ($) $ in Thousands	Sep. 30, 2025	Jun. 30, 2025	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023
Loans and Leases Receivable Disclosure [Line Items]
Loans receivable	$ 2,456,435		$ 2,255,104
Deferred costs	542		645
Allowance for credit losses	(25,342)	$ (24,651)	(26,435)	$ (26,542)	$ (26,289)	$ (23,767)
Net loans	2,431,635		2,229,314
Agriculture and Farmland Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans receivable	62,098		67,741
Construction Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans receivable	155,542		152,619
Allowance for credit losses	(2,072)	(1,478)	(893)	(1,305)	(1,841)	(959)
Commercial & Industrial Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans receivable	266,765		245,833
Multifamily [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans receivable	236,534		211,778
Allowance for credit losses	(2,112)	(1,879)	(1,805)	(2,177)	(1,914)	(1,483)
Owner Occupied [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans receivable	522,674		477,742
Non-owner Occupied [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans receivable	730,740		628,237
Allowance for credit losses	(7,067)	(6,724)	(9,345)	(8,756)	(8,026)	(5,773)
First Liens [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans receivable	377,226		373,469
Allowance for credit losses	(3,217)	(3,227)	(3,395)	(3,768)	(4,047)	(4,778)
Second Liens and Lines of Credit [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans receivable	84,395		76,713
Allowance for credit losses	(1,216)	(1,188)	(1,154)	(1,099)	(977)	(1,072)
Consumer and Other Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans receivable	17,645		17,086
Municipal Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans receivable	2,816		3,886
Allowance for credit losses	$ (41)	$ (37)	$ (48)	$ (65)	$ (64)	$ (79)