Premises and Equipment - Components of Premises and Equipment (Detail) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Property, Plant and Equipment [Line Items]
Total cost	$ 100,758	$ 98,718
Less: accumulated depreciation	(49,317)	(47,779)
Net book value	51,441	50,939
Land and Land Improvements [Member]
Property, Plant and Equipment [Line Items]
Total cost	11,820	11,772
Premises and Improvements [Member]
Property, Plant and Equipment [Line Items]
Total cost	51,515	51,191
Furniture, Equipment and Computer Software [Member]
Property, Plant and Equipment [Line Items]
Total cost	$ 37,423	$ 35,755