Premises and Equipment, Net and Other Assets - Summary of Premises and Equipment by Classification (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Property Plant And Equipment [Line Items]
Accumulated depreciation	$ (144,381)	$ (133,672)
Premises and equipment, net	278,088	269,047
Land [Member]
Property Plant And Equipment [Line Items]
Premises and Equipment, gross	47,856	44,588
Buildings [Member]
Property Plant And Equipment [Line Items]
Premises and Equipment, gross	$ 266,660	256,738
Buildings [Member] | Minimum [Member]
Property Plant And Equipment [Line Items]
Estimated Useful Lives	10 years
Buildings [Member] | Maximum [Member]
Property Plant And Equipment [Line Items]
Estimated Useful Lives	40 years
Furniture Fixtures and Equipment [Member]
Property Plant And Equipment [Line Items]
Premises and Equipment, gross	$ 91,340	89,058
Furniture Fixtures and Equipment [Member] | Minimum [Member]
Property Plant And Equipment [Line Items]
Estimated Useful Lives	3 years
Furniture Fixtures and Equipment [Member] | Maximum [Member]
Property Plant And Equipment [Line Items]
Estimated Useful Lives	15 years
Construction in Progress [Member]
Property Plant And Equipment [Line Items]
Premises and Equipment, gross	$ 16,613	$ 12,335