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Premises and Equipment and Leases Premises and Equipment and Leases (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Premises and Equipment [Line Items]      
Premises and equipment $ 974,568 $ 924,298  
Less accumulated depreciation 409,393 350,150  
Premises and equipment, net of accumulated depreciation $ 565,175 574,148  
Lease liabilities Other liabilities    
Depreciation Expense $ 68,400 63,400 $ 54,300
Lessee, Operating Lease, Liability, Payment, Due [Abstract]      
Operating Leases, Payments Due, 2023 27,130    
Operating Leases, Payments, 2024 26,894    
Operating Leases, Payments, 2025 26,092    
Operating Leases, Payments, 2026 25,306    
Operating Lease, Payments, 2027 22,925    
Operating Leases, Payments, 2028 and later 115,983    
Total undiscounted lease payments 244,330    
Less: Interest 32,278    
Lease liabilities $ 212,052    
Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration] Other Liabilities    
Lease, Cost [Abstract]      
Operating Lease, Right-of-Use Asset $ 177,000 $ 181,000  
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Premises and equipment, net of accumulated depreciation Premises and equipment, net of accumulated depreciation  
Operating Lease, Weighted Average Remaining Lease Term 10 years 2 months 12 days    
Operating Lease, Weighted Average Discount Rate, Percent 2.90%    
Lease, Cost $ 41,700 $ 35,800 42,000
Operating Lease, costs recognized as occupancy and equipment expense 24,500 23,400 25,000
Operating Lease, operating cash flows 23,300 25,300 25,600
Short-term Lease, Cost 13,000 11,500 $ 13,400
Land      
Premises and Equipment [Line Items]      
Premises and equipment 69,944 69,776  
Buildings and improvements      
Premises and Equipment [Line Items]      
Premises and equipment 469,001 472,450  
Software and related integration      
Premises and Equipment [Line Items]      
Premises and equipment 198,057 159,063  
Furniture and equipment      
Premises and Equipment [Line Items]      
Premises and equipment 201,830 186,092  
Construction in progress      
Premises and Equipment [Line Items]      
Premises and equipment $ 35,736 $ 36,917