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Premises and Equipment and Lease Commitments (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross $ 466,183 $ 442,117  
Accumulated depreciation and amortization (178,001) (152,116)  
Property, Plant and Equipment, Net 288,182 290,001  
Depreciation and amortization expense $ 22,200 $ 22,800 $ 22,100
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] Other assets Other assets  
Operating Lease, Liability, Statement of Financial Position [Extensible List] Other liabilities Other liabilities  
Lease, Cost [Abstract]      
Operating Lease, Cost $ 15,696 $ 13,963 13,992
Short-term Lease, Cost 297 354 295
Finance Lease, Interest Expense 208 227 243
Amortization of right-of-use assets 226 226 226
Sublease Income (1,309) (1,324) (1,463)
Lease, Cost $ 15,118 $ 13,446 13,293
Weighted average remaining lease term      
Operating leases 10 years 10 years 4 months 13 days  
Finance leases 6 years 10 months 2 days 7 years 10 months 2 days  
Weighted average discount rate      
Operating leases 2.71% 2.91%  
Finance leases 7.22% 7.22%  
Operating cash flows related to operating leases $ 14,712 $ 13,494 13,609
Financing cash flows related to finance leases 208 227 243
Finance Lease, Principal Payments 261 243 $ 226
Property, Plant and Equipment      
Right of Use Assets [Abstract]      
Operating Lease, Right-of-Use Asset 92,819 83,647  
Finance Lease, Right-of-Use Asset 1,544 1,770  
Total right-of-use assets 94,363 85,417  
Lease Liabilities [Abstract]      
Operating Lease, Liability 97,925 87,737  
Finance Lease, Liability 2,739 3,001  
Total lease liabilities 100,664 90,738  
Operating Leases      
2022 14,557    
2023 13,879    
2024 13,908    
2025 11,717    
2026 9,580    
Thereafter 50,498    
Total 114,139    
Lessee, Operating Lease, Liability, Undiscounted Excess Amount (16,214)    
Net lease liabilities 97,925 87,737  
Finance Leases      
2022 470    
2023 479    
2024 527    
2025 527    
2026 527    
Thereafter 967    
Finance Lease, Liability, Payment, Due 3,497    
Finance Lease, Liability, Undiscounted Excess Amount (758)    
Net lease liabilities 2,739 3,001  
Land      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross 70,240 70,140  
Building      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross $ 202,255 194,432  
Building | Minimum      
Property, Plant and Equipment [Line Items]      
Range of Useful Lives 15 years    
Building | Maximum      
Property, Plant and Equipment [Line Items]      
Range of Useful Lives 30 years    
Leaseholds and Leasehold Improvements      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross $ 54,922 50,867  
Leaseholds and Leasehold Improvements | Minimum      
Property, Plant and Equipment [Line Items]      
Range of Useful Lives 15 years    
Leaseholds and Leasehold Improvements | Maximum      
Property, Plant and Equipment [Line Items]      
Range of Useful Lives 20 years    
Furniture and Equipment      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross $ 138,766 $ 126,678  
Furniture and Equipment | Minimum      
Property, Plant and Equipment [Line Items]      
Range of Useful Lives 3 years    
Furniture and Equipment | Maximum      
Property, Plant and Equipment [Line Items]      
Range of Useful Lives 20 years