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Loans and Allowance for Credit Losses (Disaggregation of Credit Quality Disclosures) (Details) - USD ($) $ in Thousands | Jun. 30, 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 | $ 4,383,632 |
Term Loans, Amortized Cost Basis by Origination Year, 2019 | 3,422,279 |
Term Loans, Amortized Cost Basis by Origination Year, 2018 | 2,272,688 |
Term Loans, Amortized Cost Basis by Origination Year, 2017 | 1,800,876 |
Term Loans, Amortized Cost Basis by Origination Year, 2016 | 1,265,588 |
Term Loans, Amortized Cost Basis by Origination Year, Prior | 1,750,203 |
Revolving Loans | 2,684,222 |
Revolving Loans Converted to Term Loans | 127,309 |
Notes Receivable Gross | 17,706,797 | $ 16,057,306
Total Commercial [Member] | Pass [Member] |  |
Accounts Notes And Loans Receivable [Line Items] |  |
Term Loans, Amortized Cost Basis by Origination Year, 2020 | 4,296,564 |
Term Loans, Amortized Cost Basis by Origination Year, 2019 | 3,327,755 |
Term Loans, Amortized Cost Basis by Origination Year, 2018 | 2,146,064 |
Term Loans, Amortized Cost Basis by Origination Year, 2017 | 1,672,980 |
Term Loans, Amortized Cost Basis by Origination Year, 2016 | 1,187,467 |
Term Loans, Amortized Cost Basis by Origination Year, Prior | 1,605,845 |
Revolving Loans | 2,518,581 |
Revolving Loans Converted to Term Loans | 100,625 |
Notes Receivable Gross | 16,855,881 | 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 | 52,823 |
Term Loans, Amortized Cost Basis by Origination Year, 2019 | 53,406 |
Term Loans, Amortized Cost Basis by Origination Year, 2018 | 64,528 |
Term Loans, Amortized Cost Basis by Origination Year, 2017 | 86,433 |
Term Loans, Amortized Cost Basis by Origination Year, 2016 | 45,023 |
Term Loans, Amortized Cost Basis by Origination Year, Prior | 85,315 |
Revolving Loans | 102,437 |
Revolving Loans Converted to Term Loans | 12,810 |
Notes Receivable Gross | 502,775 | 462,502
Total Commercial [Member] | Special Mention [Member] |  |
Accounts Notes And Loans Receivable [Line Items] |  |
Term Loans, Amortized Cost Basis by Origination Year, 2020 | 1,598 |
Term Loans, Amortized Cost Basis by Origination Year, 2019 | 4,372 |
Term Loans, Amortized Cost Basis by Origination Year, 2018 | 5,798 |
Term Loans, Amortized Cost Basis by Origination Year, 2017 | 26,179 |
Term Loans, Amortized Cost Basis by Origination Year, 2016 | 13,687 |
Term Loans, Amortized Cost Basis by Origination Year, Prior | 16,091 |
Revolving Loans | 11,882 |
Revolving Loans Converted to Term Loans | 1,242 |
Notes Receivable Gross | 80,849 | 101,583
Total Commercial [Member] | Substandard [Member] |  |
Accounts Notes And Loans Receivable [Line Items] |  |
Term Loans, Amortized Cost Basis by Origination Year, 2020 | 32,647 |
Term Loans, Amortized Cost Basis by Origination Year, 2019 | 36,746 |
Term Loans, Amortized Cost Basis by Origination Year, 2018 | 56,298 |
Term Loans, Amortized Cost Basis by Origination Year, 2017 | 15,284 |
Term Loans, Amortized Cost Basis by Origination Year, 2016 | 19,411 |
Term Loans, Amortized Cost Basis by Origination Year, Prior | 42,952 |
Revolving Loans | 51,322 |
Revolving Loans Converted to Term Loans | 12,632 |
Notes Receivable Gross | 267,292 | 479,110
Residential Mortgage and Consumer [Member] |  |
Accounts Notes And Loans Receivable [Line Items] |  |
Term Loans, Amortized Cost Basis by Origination Year, 2020 | 278,488 |
Term Loans, Amortized Cost Basis by Origination Year, 2019 | 510,452 |
Term Loans, Amortized Cost Basis by Origination Year, 2018 | 537,913 |
Term Loans, Amortized Cost Basis by Origination Year, 2017 | 709,193 |
Term Loans, Amortized Cost Basis by Origination Year, 2016 | 589,269 |
Term Loans, Amortized Cost Basis by Origination Year, Prior | 1,040,807 |
Revolving Loans | 1,245,995 |
Revolving Loans Converted to Term Loans | 9,463 |
Notes Receivable Gross | 4,921,580 | 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 | 277,534 |
Term Loans, Amortized Cost Basis by Origination Year, 2019 | 506,177 |
Term Loans, Amortized Cost Basis by Origination Year, 2018 | 531,553 |
Term Loans, Amortized Cost Basis by Origination Year, 2017 | 698,878 |
Term Loans, Amortized Cost Basis by Origination Year, 2016 | 583,723 |
Term Loans, Amortized Cost Basis by Origination Year, Prior | 1,004,835 |
Revolving Loans | 1,242,586 |
Revolving Loans Converted to Term Loans | 5,459 |
Notes Receivable Gross | 4,850,745 | 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 | 954 |
Term Loans, Amortized Cost Basis by Origination Year, 2019 | 4,275 |
Term Loans, Amortized Cost Basis by Origination Year, 2018 | 6,360 |
Term Loans, Amortized Cost Basis by Origination Year, 2017 | 10,315 |
Term Loans, Amortized Cost Basis by Origination Year, 2016 | 5,546 |
Term Loans, Amortized Cost Basis by Origination Year, Prior | 35,972 |
Revolving Loans | 3,409 |
Revolving Loans Converted to Term Loans | 4,004 |
Notes Receivable Gross | $ 70,835 | $ 57,283

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