Premises and Equipment (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Right-of-use lease assets	$ 52,912	$ 48,855
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	Total premises and equipment, net	Total premises and equipment, net
Accumulated depreciation and amortization	$ (178,333)	$ (171,144)
Total premises and equipment, net	486,531	483,469
Land
Property, Plant and Equipment [Line Items]
Premises and equipment	101,444	101,728
Buildings and improvements
Property, Plant and Equipment [Line Items]
Premises and equipment	320,024	320,844
Furniture, fixtures and equipment
Property, Plant and Equipment [Line Items]
Premises and equipment	107,739	107,122
Software
Property, Plant and Equipment [Line Items]
Premises and equipment	67,175	66,947
Construction in progress
Property, Plant and Equipment [Line Items]
Premises and equipment	$ 15,570	$ 9,117