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Loans and Allowance for Loan Losses (Narrative) (Details)
 3 Months Ended
Mar. 31, 2021
USD ($)
contract
Mar. 31, 2020
USD ($)
contract
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Interest income recognized, cash basis $ 622,000 $ 961,000    
Loans pledged as collateral 14,270,000,000   $ 15,050,000,000.00  
Total loans 38,805,101,000   38,252,984,000  
Financing Receivable, Allowance for Credit Loss 563,214,000 493,452,000 605,736,000 $ 281,402,000
Reserve for unfunded commitments 51,500,000      
All Financing Receivable, Allowance for Credit Loss 614,700,000      
(Reversal of) provision for credit losses (18,575,000) 158,722,000    
Allowance for Loan and Lease Losses Write-offs, Net 20,200,000      
Allowance for credit loss, increase $ 38,800,000      
ACL to loans ratio 1.58%      
Recorded Investment $ 15,475,000 $ 36,695,000    
Commitments to land additional funds to TDRs 0   0  
Loans, net of deferred fees and costs 38,805,101,000   38,252,984,000  
Financing Receivable, Allowance For Credit Loss, Period Increase (Decrease) From Increase in Size of Loan Profile 15,200,000      
Financing Receivable, Purchase 607,000,000.0      
Financing Receivable, Purchase, Prime Auto $ 476,200,000      
Troubled Debt Restructuring That Subsequently Defaults        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Number of contracts | contract 0 3    
Recorded Investment   $ 618,000    
Total commercial and industrial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans $ 19,693,834,000   19,520,168,000  
Recorded Investment 7,449,000 7,198,000    
Loans, net of deferred fees and costs 19,693,834,000   $ 19,520,168,000  
Total commercial and industrial | Small Business Administration (SBA), CARES Act, Paycheck Protection Program        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans 2,360,000,000      
Interest Income Recorded        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Interest income recognized $ 3,400,000 $ 2,100,000    
Substandard        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Retail loan substandard period (in days) 90 days      
Loss and Charged Off        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Retail loan charge off (in days) 120 days