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Premises and Equipment and Leases Premises and Equipment and Leases (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Premises and Equipment [Line Items]      
Premises and equipment $ 843,041 $ 779,050  
Less accumulated depreciation 291,733 243,531  
Premises and equipment, net of accumulated depreciation 551,308 535,519  
Depreciation Expense 54,300 51,600 $ 51,200
Lease, Cost [Abstract]      
Operating Lease, Right-of-Use Asset $ 166,000 180,000  
Operating Lease, Weighted Average Remaining Lease Term 11 years    
Operating Lease, Weighted Average Discount Rate, Percent 3.00%    
Operating Lease, costs recognized as occupancy and equipment expense $ 25,000 24,200  
Operating Lease, operating cash flows 25,600 23,300  
Lease, Cost 42,000 43,000 $ 28,500
Short-term Lease, Cost 13,400 12,600  
Lessee, Operating Lease, Liability, Payment, Due [Abstract]      
Operating Leases, Payments Due, 2021 26,300    
Operating Leases, Payments, 2022 21,200    
Operating Leases, Payments, 2023 20,100    
Operating Leases, Payments, 2024 19,600    
Operating Lease, Payments, 2025 18,900    
Operating Leases, Payments, 2026 and later 116,000    
Land      
Premises and Equipment [Line Items]      
Premises and equipment 69,776 69,960  
Buildings and improvements      
Premises and Equipment [Line Items]      
Premises and equipment 440,528 421,952  
Software and related integration      
Premises and Equipment [Line Items]      
Premises and equipment 120,444 98,487  
Furniture and equipment      
Premises and Equipment [Line Items]      
Premises and equipment 165,344 135,153  
Construction in progress      
Premises and Equipment [Line Items]      
Premises and equipment $ 46,949 $ 53,498