Premises and Equipment - Summary of Premises and Equipment (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Less: Accumulated depreciation	$ (58,401)	$ (57,462)
Premises and equipment, net	78,687	83,731
Depreciable premises and equipment
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	135,689	140,833
Premises and equipment, net	77,288	83,371
Land and land improvements
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	29,002	29,505
Buildings
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	64,382	65,334
Furniture and equipment
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	42,305	45,994
Construction in progress
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	$ 1,399	$ 360