Premises and Equipment, Summary Composition (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Cost	$ 749,981
Accumulated Depreciation	377,003
Net Book Value	372,978	$ 376,906
Depreciation and amortization	46,989	45,088	$ 46,508
Land
Property, Plant and Equipment [Line Items]
Cost	63,984
Accumulated Depreciation	0
Net Book Value	63,984	65,516
Land improvements
Property, Plant and Equipment [Line Items]
Cost	21,659
Accumulated Depreciation	10,409
Net Book Value	11,250	10,074
Buildings and improvements
Property, Plant and Equipment [Line Items]
Cost	399,575
Accumulated Depreciation	187,572
Net Book Value	212,004	213,496
Computers and related equipment
Property, Plant and Equipment [Line Items]
Cost	57,265
Accumulated Depreciation	46,420
Net Book Value	10,845	12,606
Furniture, fixtures and other equipment
Property, Plant and Equipment [Line Items]
Cost	124,108
Accumulated Depreciation	88,481
Net Book Value	35,627	33,110
Operating leases
Property, Plant and Equipment [Line Items]
Cost	43,782
Accumulated Depreciation	19,070
Net Book Value	24,712	25,617
Leasehold improvements
Property, Plant and Equipment [Line Items]
Cost	39,607
Accumulated Depreciation	25,051
Net Book Value	$ 14,556	$ 16,487