Premises and Equipment - Schedule of Premises and Equipment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Property plant and equipment, gross	$ 291,104	$ 291,264
Less accumulated depreciation and amortization	170,329	165,747
Total premises and equipment	120,775	125,517
Land [Member]
Property, Plant and Equipment [Line Items]
Property plant and equipment, gross	14,621	15,441
Buildings and improvements [Member]
Property, Plant and Equipment [Line Items]
Property plant and equipment, gross	$ 75,149	77,003
Buildings and improvements [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Life	10 years
Buildings and improvements [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Life	50 years
Property Subject to Operating Lease [Member]
Property, Plant and Equipment [Line Items]
Property plant and equipment, gross	$ 47,938	48,642
Property Subject to Operating Lease [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Life	1 year
Property Subject to Operating Lease [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Life	25 years
Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Property plant and equipment, gross	$ 35,909	35,347
Leasehold improvements [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Life	5 years
Leasehold improvements [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Life	40 years
Furniture and equipment [Member]
Property, Plant and Equipment [Line Items]
Property plant and equipment, gross	$ 73,976	73,150
Furniture and equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Life	3 years
Furniture and equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Life	7 years
Software [Member]
Property, Plant and Equipment [Line Items]
Property plant and equipment, gross	$ 43,511	$ 41,681
Software [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Life	3 years
Software [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Life	7 years