Premises and Equipment - Schedule of Right-of-use Asset and Lease Obligations by Type of Property (Detail) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Property, Plant and Equipment [Line Items]
Operating Lease, Right-of-Use Asset	$ 3,600	$ 3,291
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Other Assets	Other Assets
Operating Leases, Lease Liability	$ 3,601	$ 3,307
Operating Leases, Weighted Average Lease Term in Years	12 years 6 months	14 years 9 months 18 days
Operating Leases, Weighted Average Discount Rate	3.29%	3.00%
Land and Building Leases [Member]
Property, Plant and Equipment [Line Items]
Operating Lease, Right-of-Use Asset	$ 3,600	$ 3,291
Operating Leases, Lease Liability	$ 3,601	$ 3,307
Operating Leases, Weighted Average Lease Term in Years	12 years 6 months	14 years 9 months 18 days
Operating Leases, Weighted Average Discount Rate	3.29%	3.00%