Premises and Equipment - Summary of Premises and Equipment (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	$ 742,899	$ 629,868
Accumulated depreciation	(158,786)	(153,682)
Premises and equipment, net	584,113	476,186
Land
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	94,160	71,014
Buildings
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	446,988	394,400
Furniture, fixtures, and equipment
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	139,350	118,124
Leasehold improvements
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	$ 62,401	$ 46,330