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Loans and Allowance for Credit Losses (Disaggregation of Credit Quality Disclosures) (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Total Commercial [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Term Loans, Amortized Cost Basis by Origination Year, 2020 $ 5,133,272  
Term Loans, Amortized Cost Basis by Origination Year, 2019 3,236,052  
Term Loans, Amortized Cost Basis by Origination Year, 2018 2,085,143  
Term Loans, Amortized Cost Basis by Origination Year, 2017 1,641,803  
Term Loans, Amortized Cost Basis by Origination Year, 2016 1,169,989  
Term Loans, Amortized Cost Basis by Origination Year, Prior 1,586,835  
Revolving Loans 2,584,861  
Revolving Loans Converted to Term Loans 101,943  
Notes Receivable Gross 17,539,898 $ 16,057,306
Total Commercial [Member] | Pass [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Term Loans, Amortized Cost Basis by Origination Year, 2020 4,980,953  
Term Loans, Amortized Cost Basis by Origination Year, 2019 3,098,996  
Term Loans, Amortized Cost Basis by Origination Year, 2018 1,979,152  
Term Loans, Amortized Cost Basis by Origination Year, 2017 1,508,213  
Term Loans, Amortized Cost Basis by Origination Year, 2016 1,067,144  
Term Loans, Amortized Cost Basis by Origination Year, Prior 1,417,583  
Revolving Loans 2,385,763  
Revolving Loans Converted to Term Loans 82,942  
Notes Receivable Gross 16,520,746 15,014,111
Total Commercial [Member] | Pass-Watch [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Term Loans, Amortized Cost Basis by Origination Year, 2020 70,389  
Term Loans, Amortized Cost Basis by Origination Year, 2019 101,741  
Term Loans, Amortized Cost Basis by Origination Year, 2018 56,681  
Term Loans, Amortized Cost Basis by Origination Year, 2017 78,598  
Term Loans, Amortized Cost Basis by Origination Year, 2016 53,259  
Term Loans, Amortized Cost Basis by Origination Year, Prior 116,413  
Revolving Loans 125,134  
Revolving Loans Converted to Term Loans 5,352  
Notes Receivable Gross 607,567 462,502
Total Commercial [Member] | Special Mention [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Term Loans, Amortized Cost Basis by Origination Year, 2020 5,687  
Term Loans, Amortized Cost Basis by Origination Year, 2019 13,763  
Term Loans, Amortized Cost Basis by Origination Year, 2018 24,805  
Term Loans, Amortized Cost Basis by Origination Year, 2017 17,888  
Term Loans, Amortized Cost Basis by Origination Year, 2016 31,355  
Term Loans, Amortized Cost Basis by Origination Year, Prior 2,268  
Revolving Loans 25,960  
Revolving Loans Converted to Term Loans 2,900  
Notes Receivable Gross 124,626 101,583
Total Commercial [Member] | Substandard [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Term Loans, Amortized Cost Basis by Origination Year, 2020 76,243  
Term Loans, Amortized Cost Basis by Origination Year, 2019 21,552  
Term Loans, Amortized Cost Basis by Origination Year, 2018 24,505  
Term Loans, Amortized Cost Basis by Origination Year, 2017 37,104  
Term Loans, Amortized Cost Basis by Origination Year, 2016 18,231  
Term Loans, Amortized Cost Basis by Origination Year, Prior 50,571  
Revolving Loans 48,004  
Revolving Loans Converted to Term Loans 10,749  
Notes Receivable Gross 286,959 479,110
Residential Mortgage and Consumer [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Term Loans, Amortized Cost Basis by Origination Year, 2020 353,072  
Term Loans, Amortized Cost Basis by Origination Year, 2019 505,712  
Term Loans, Amortized Cost Basis by Origination Year, 2018 495,188  
Term Loans, Amortized Cost Basis by Origination Year, 2017 640,043  
Term Loans, Amortized Cost Basis by Origination Year, 2016 541,558  
Term Loans, Amortized Cost Basis by Origination Year, Prior 937,148  
Revolving Loans 1,215,976  
Revolving Loans Converted to Term Loans 11,609  
Notes Receivable Gross 4,700,306 5,155,449
Residential Mortgage and Consumer [Member] | Performing [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Term Loans, Amortized Cost Basis by Origination Year, 2020 351,828  
Term Loans, Amortized Cost Basis by Origination Year, 2019 501,172  
Term Loans, Amortized Cost Basis by Origination Year, 2018 489,007  
Term Loans, Amortized Cost Basis by Origination Year, 2017 629,621  
Term Loans, Amortized Cost Basis by Origination Year, 2016 536,380  
Term Loans, Amortized Cost Basis by Origination Year, Prior 901,979  
Revolving Loans 1,212,937  
Revolving Loans Converted to Term Loans 5,609  
Notes Receivable Gross 4,628,533 5,098,166
Residential Mortgage and Consumer [Member] | Nonperforming [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Term Loans, Amortized Cost Basis by Origination Year, 2020 1,244  
Term Loans, Amortized Cost Basis by Origination Year, 2019 4,540  
Term Loans, Amortized Cost Basis by Origination Year, 2018 6,181  
Term Loans, Amortized Cost Basis by Origination Year, 2017 10,422  
Term Loans, Amortized Cost Basis by Origination Year, 2016 5,178  
Term Loans, Amortized Cost Basis by Origination Year, Prior 35,169  
Revolving Loans 3,039  
Revolving Loans Converted to Term Loans 6,000  
Notes Receivable Gross $ 71,773 $ 57,283