Premises and Equipment - Major Classes of Premises and Equipment and the Total Accumulated Depreciation (Detail) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Property Plant And Equipment [Line Items]
Total fixed assets	$ 29,149	$ 28,780
Less accumulated depreciation	14,670	13,691
Net fixed assets	14,479	15,089
Land [Member]
Property Plant And Equipment [Line Items]
Total fixed assets	2,903	2,903
Building and Improvements [Member]
Property Plant And Equipment [Line Items]
Total fixed assets	13,785	13,626
ROU Assets [Member]
Property Plant And Equipment [Line Items]
Total fixed assets	1,109	1,495
Furniture, Fixtures and Equipment [Member]
Property Plant And Equipment [Line Items]
Total fixed assets	$ 11,352	$ 10,756