Premises and Equipment - Components of Premises and Equipment (Detail) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Property, Plant and Equipment [Line Items]
Premises and equipment, cost	$ 24,209	$ 24,260
Accumulated depreciation	11,207	10,846
Premises and equipment, net	13,002	13,414
Land and Improvements [Member]
Property, Plant and Equipment [Line Items]
Premises and equipment, cost	2,540	2,550
Buildings and Improvements [Member]
Property, Plant and Equipment [Line Items]
Premises and equipment, cost	14,698	14,459
Furniture and Equipment [Member]
Property, Plant and Equipment [Line Items]
Premises and equipment, cost	6,642	6,922
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Premises and equipment, cost	$ 329	$ 329