Premises and Equipment, Summary Composition (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Cost	$ 734,829
Accumulated Depreciation	357,923
Net Book Value	376,906	$ 385,173
Depreciation and amortization	45,088	46,508	$ 50,567
Land
Property, Plant and Equipment [Line Items]
Cost	65,516
Accumulated Depreciation	0
Net Book Value	65,516	66,830
Land improvements
Property, Plant and Equipment [Line Items]
Cost	19,785
Accumulated Depreciation	9,711
Net Book Value	10,074	9,555
Buildings and improvements
Property, Plant and Equipment [Line Items]
Cost	393,329
Accumulated Depreciation	179,833
Net Book Value	213,496	213,130
Computers and related equipment
Property, Plant and Equipment [Line Items]
Cost	55,226
Accumulated Depreciation	42,620
Net Book Value	12,606	13,831
Furniture, fixtures and other equipment
Property, Plant and Equipment [Line Items]
Cost	118,887
Accumulated Depreciation	85,776
Net Book Value	33,110	41,787
Operating leases
Property, Plant and Equipment [Line Items]
Cost	42,633
Accumulated Depreciation	17,017
Net Book Value	25,617	28,299
Leasehold improvements
Property, Plant and Equipment [Line Items]
Cost	39,454
Accumulated Depreciation	22,966
Net Book Value	$ 16,487	$ 11,741