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Loans and Allowance for Credit Losses (Disaggregation of Credit Quality Disclosures) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Total Commercial [Member] |  |
Accounts Notes And Loans Receivable [Line Items] |  |
Term Loans, Amortized Cost Basis by Origination Year, 2020 | $ 5,867,582 |
Term Loans, Amortized Cost Basis by Origination Year, 2019 | 2,977,170 |
Term Loans, Amortized Cost Basis by Origination Year, 2018 | 1,832,860 |
Term Loans, Amortized Cost Basis by Origination Year, 2017 | 1,500,272 |
Term Loans, Amortized Cost Basis by Origination Year, 2016 | 1,062,429 |
Term Loans, Amortized Cost Basis by Origination Year, Prior | 1,357,011 |
Revolving Loans | 2,543,475 |
Revolving Loans Converted to Term Loans | 126,625 |
Notes Receivable Gross | 17,267,424 | $ 16,057,306
Total Commercial [Member] | Pass [Member] |  |
Accounts Notes And Loans Receivable [Line Items] |  |
Term Loans, Amortized Cost Basis by Origination Year, 2020 | 5,673,370 |
Term Loans, Amortized Cost Basis by Origination Year, 2019 | 2,819,696 |
Term Loans, Amortized Cost Basis by Origination Year, 2018 | 1,740,784 |
Term Loans, Amortized Cost Basis by Origination Year, 2017 | 1,391,140 |
Term Loans, Amortized Cost Basis by Origination Year, 2016 | 960,094 |
Term Loans, Amortized Cost Basis by Origination Year, Prior | 1,231,913 |
Revolving Loans | 2,420,058 |
Revolving Loans Converted to Term Loans | 95,847 |
Notes Receivable Gross | 16,332,902 | 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 | 115,555 |
Term Loans, Amortized Cost Basis by Origination Year, 2019 | 96,473 |
Term Loans, Amortized Cost Basis by Origination Year, 2018 | 50,475 |
Term Loans, Amortized Cost Basis by Origination Year, 2017 | 42,877 |
Term Loans, Amortized Cost Basis by Origination Year, 2016 | 58,331 |
Term Loans, Amortized Cost Basis by Origination Year, Prior | 84,363 |
Revolving Loans | 74,629 |
Revolving Loans Converted to Term Loans | 19,182 |
Notes Receivable Gross | 541,885 | 462,502
Total Commercial [Member] | Special Mention [Member] |  |
Accounts Notes And Loans Receivable [Line Items] |  |
Term Loans, Amortized Cost Basis by Origination Year, 2020 | 3,196 |
Term Loans, Amortized Cost Basis by Origination Year, 2019 | 27,157 |
Term Loans, Amortized Cost Basis by Origination Year, 2018 | 21,074 |
Term Loans, Amortized Cost Basis by Origination Year, 2017 | 30,872 |
Term Loans, Amortized Cost Basis by Origination Year, 2016 | 28,933 |
Term Loans, Amortized Cost Basis by Origination Year, Prior | 4,146 |
Revolving Loans | 18,626 |
Revolving Loans Converted to Term Loans | 3,588 |
Notes Receivable Gross | 137,592 | 101,583
Total Commercial [Member] | Substandard [Member] |  |
Accounts Notes And Loans Receivable [Line Items] |  |
Term Loans, Amortized Cost Basis by Origination Year, 2020 | 75,461 |
Term Loans, Amortized Cost Basis by Origination Year, 2019 | 33,844 |
Term Loans, Amortized Cost Basis by Origination Year, 2018 | 20,527 |
Term Loans, Amortized Cost Basis by Origination Year, 2017 | 35,383 |
Term Loans, Amortized Cost Basis by Origination Year, 2016 | 15,071 |
Term Loans, Amortized Cost Basis by Origination Year, Prior | 36,589 |
Revolving Loans | 30,162 |
Revolving Loans Converted to Term Loans | 8,008 |
Notes Receivable Gross | 255,045 | 479,110
Residential Mortgage and Consumer [Member] |  |
Accounts Notes And Loans Receivable [Line Items] |  |
Term Loans, Amortized Cost Basis by Origination Year, 2020 | 440,297 |
Term Loans, Amortized Cost Basis by Origination Year, 2019 | 507,905 |
Term Loans, Amortized Cost Basis by Origination Year, 2018 | 443,399 |
Term Loans, Amortized Cost Basis by Origination Year, 2017 | 568,727 |
Term Loans, Amortized Cost Basis by Origination Year, 2016 | 504,999 |
Term Loans, Amortized Cost Basis by Origination Year, Prior | 852,067 |
Revolving Loans | 1,194,427 |
Revolving Loans Converted to Term Loans | 10,686 |
Notes Receivable Gross | 4,522,507 | 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 | 438,831 |
Term Loans, Amortized Cost Basis by Origination Year, 2019 | 504,124 |
Term Loans, Amortized Cost Basis by Origination Year, 2018 | 437,518 |
Term Loans, Amortized Cost Basis by Origination Year, 2017 | 560,347 |
Term Loans, Amortized Cost Basis by Origination Year, 2016 | 501,018 |
Term Loans, Amortized Cost Basis by Origination Year, Prior | 816,567 |
Revolving Loans | 1,190,775 |
Revolving Loans Converted to Term Loans | 6,127 |
Notes Receivable Gross | 4,455,307 | 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 | 1,466 |
Term Loans, Amortized Cost Basis by Origination Year, 2019 | 3,781 |
Term Loans, Amortized Cost Basis by Origination Year, 2018 | 5,881 |
Term Loans, Amortized Cost Basis by Origination Year, 2017 | 8,380 |
Term Loans, Amortized Cost Basis by Origination Year, 2016 | 3,981 |
Term Loans, Amortized Cost Basis by Origination Year, Prior | 35,500 |
Revolving Loans | 3,652 |
Revolving Loans Converted to Term Loans | 4,559 |
Notes Receivable Gross | $ 67,200 | $ 57,283

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