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Loans And Allowance For Loan Losses (Schedule Of Allowances For Loan Losses And Recorded Investment In Loans) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Jan. 01, 2020
Dec. 31, 2017
Allowance for Loan and Lease Losses [Roll Forward]          
Charge-offs $ (119,262,000) $ (79,135,000) $ (74,054,000)    
Recoveries 24,550,000 21,523,000 23,644,000    
Provision for credit losses(1) 336,052,000 87,720,000 51,697,000    
Transfer of unfunded commitment reserve   739,000      
Deferred fees and costs, net (77,700,000) (25,400,000)      
Purchased credit-impaired loans     0    
Allowance for purchased credit-impaired loans   0 0    
Financing Receivable, Allowance for Credit Loss 605,736,000 281,402,000 250,555,000 $ 281,402,000 $ 249,268,000
Reserve for Unfunded Commitments 47,800,000     1,375,000  
All Financing Receivable, Allowance for Credit Loss 653,500,000     282,777,000  
Provision for credit losses 355,022,000 87,720,000 51,697,000    
Cumulative Effect, Period of Adoption, Adjustment          
Allowance for Loan and Lease Losses [Roll Forward]          
Financing Receivable, Allowance for Credit Loss       82,994,000  
Reserve for Unfunded Commitments       27,440,000  
All Financing Receivable, Allowance for Credit Loss       110,434,000  
Cumulative Effect, Period of Adoption, Adjusted Balance          
Allowance for Loan and Lease Losses [Roll Forward]          
Financing Receivable, Allowance for Credit Loss       364,396,000  
Total commercial and industrial          
Allowance for Loan and Lease Losses [Roll Forward]          
Charge-offs (76,260,000) (49,572,000) (48,775,000)    
Recoveries 13,544,000 7,827,000 7,165,000    
Provision for credit losses(1) 148,799,000 53,665,000 47,930,000    
Transfer of unfunded commitment reserve   739,000      
Financing Receivable, Allowance for Credit Loss 229,555,000 145,782,000 133,123,000 145,782,000 126,803,000
Total commercial and industrial | Cumulative Effect, Period of Adoption, Adjustment          
Allowance for Loan and Lease Losses [Roll Forward]          
Financing Receivable, Allowance for Credit Loss       (2,310,000)  
Total commercial and industrial | Cumulative Effect, Period of Adoption, Adjusted Balance          
Allowance for Loan and Lease Losses [Roll Forward]          
Financing Receivable, Allowance for Credit Loss       143,472,000  
Total commercial real estate          
Allowance for Loan and Lease Losses [Roll Forward]          
Charge-offs (13,213,000) (5,540,000) (4,408,000)    
Recoveries 2,857,000 8,618,000 10,188,000    
Provision for credit losses(1) 74,319,000 (4,444,000) (11,982,000)    
Transfer of unfunded commitment reserve   0      
Financing Receivable, Allowance for Credit Loss 130,742,000 67,430,000 68,796,000 67,430,000 74,998,000
Total commercial real estate | Cumulative Effect, Period of Adoption, Adjustment          
Allowance for Loan and Lease Losses [Roll Forward]          
Financing Receivable, Allowance for Credit Loss       (651,000)  
Total commercial real estate | Cumulative Effect, Period of Adoption, Adjusted Balance          
Allowance for Loan and Lease Losses [Roll Forward]          
Financing Receivable, Allowance for Credit Loss       66,779,000  
Total consumer          
Allowance for Loan and Lease Losses [Roll Forward]          
Charge-offs (29,789,000) (24,023,000) (20,871,000)    
Recoveries 8,149,000 5,078,000 6,291,000    
Provision for credit losses(1) 112,934,000 38,499,000 15,749,000    
Transfer of unfunded commitment reserve   0      
Financing Receivable, Allowance for Credit Loss $ 245,439,000 $ 68,190,000 $ 48,636,000 68,190,000 $ 47,467,000
Total consumer | Cumulative Effect, Period of Adoption, Adjustment          
Allowance for Loan and Lease Losses [Roll Forward]          
Financing Receivable, Allowance for Credit Loss       85,955,000  
Total consumer | Cumulative Effect, Period of Adoption, Adjusted Balance          
Allowance for Loan and Lease Losses [Roll Forward]          
Financing Receivable, Allowance for Credit Loss       $ 154,145,000