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Loans and Allowance for Credit Losses (Disaggregation of Credit Quality Disclosures) (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Total Commercial [Member] |  |
Accounts Notes And Loans Receivable [Line Items] |  |
Term Loans, Amortized Cost Basis by Origination Year, 2021 | $ 3,999,639 |
Term Loans, Amortized Cost Basis by Origination Year, 2020 | 3,447,115 |
Term Loans, Amortized Cost Basis by Origination Year, 2019 | 2,425,787 |
Term Loans, Amortized Cost Basis by Origination Year, 2018 | 1,434,200 |
Term Loans, Amortized Cost Basis by Origination Year, 2017 | 1,175,313 |
Term Loans, Amortized Cost Basis by Origination Year, Prior | 1,633,575 |
Revolving Loans | 2,667,146 |
Revolving Loans Converted to Term Loans | 129,071 |
Notes Receivable Gross | 16,911,846 | $ 17,267,424
Total Commercial [Member] | Pass [Member] |  |
Accounts Notes And Loans Receivable [Line Items] |  |
Term Loans, Amortized Cost Basis by Origination Year, 2021 | 3,916,476 |
Term Loans, Amortized Cost Basis by Origination Year, 2020 | 3,333,009 |
Term Loans, Amortized Cost Basis by Origination Year, 2019 | 2,308,701 |
Term Loans, Amortized Cost Basis by Origination Year, 2018 | 1,374,599 |
Term Loans, Amortized Cost Basis by Origination Year, 2017 | 1,105,917 |
Term Loans, Amortized Cost Basis by Origination Year, Prior | 1,520,061 |
Revolving Loans | 2,582,321 |
Revolving Loans Converted to Term Loans | 105,856 |
Notes Receivable Gross | 16,246,940 | 16,332,902
Total Commercial [Member] | Pass-Watch [Member] |  |
Accounts Notes And Loans Receivable [Line Items] |  |
Term Loans, Amortized Cost Basis by Origination Year, 2021 | 40,835 |
Term Loans, Amortized Cost Basis by Origination Year, 2020 | 59,789 |
Term Loans, Amortized Cost Basis by Origination Year, 2019 | 71,484 |
Term Loans, Amortized Cost Basis by Origination Year, 2018 | 31,238 |
Term Loans, Amortized Cost Basis by Origination Year, 2017 | 22,528 |
Term Loans, Amortized Cost Basis by Origination Year, Prior | 82,569 |
Revolving Loans | 47,600 |
Revolving Loans Converted to Term Loans | 15,253 |
Notes Receivable Gross | 371,296 | 541,885
Total Commercial [Member] | Special Mention [Member] |  |
Accounts Notes And Loans Receivable [Line Items] |  |
Term Loans, Amortized Cost Basis by Origination Year, 2021 | 15,346 |
Term Loans, Amortized Cost Basis by Origination Year, 2020 | 3,105 |
Term Loans, Amortized Cost Basis by Origination Year, 2019 | 6,857 |
Term Loans, Amortized Cost Basis by Origination Year, 2018 | 11,061 |
Term Loans, Amortized Cost Basis by Origination Year, 2017 | 19,648 |
Term Loans, Amortized Cost Basis by Origination Year, Prior | 8,613 |
Revolving Loans | 11,841 |
Revolving Loans Converted to Term Loans | 1,296 |
Notes Receivable Gross | 77,767 | 137,592
Total Commercial [Member] | Substandard [Member] |  |
Accounts Notes And Loans Receivable [Line Items] |  |
Term Loans, Amortized Cost Basis by Origination Year, 2021 | 26,982 |
Term Loans, Amortized Cost Basis by Origination Year, 2020 | 51,212 |
Term Loans, Amortized Cost Basis by Origination Year, 2019 | 38,745 |
Term Loans, Amortized Cost Basis by Origination Year, 2018 | 17,302 |
Term Loans, Amortized Cost Basis by Origination Year, 2017 | 27,220 |
Term Loans, Amortized Cost Basis by Origination Year, Prior | 22,332 |
Revolving Loans | 25,384 |
Revolving Loans Converted to Term Loans | 6,666 |
Notes Receivable Gross | 215,843 | 255,045
Residential Mortgage and Consumer [Member] |  |
Accounts Notes And Loans Receivable [Line Items] |  |
Term Loans, Amortized Cost Basis by Origination Year, 2021 | 330,749 |
Term Loans, Amortized Cost Basis by Origination Year, 2020 | 462,370 |
Term Loans, Amortized Cost Basis by Origination Year, 2019 | 403,676 |
Term Loans, Amortized Cost Basis by Origination Year, 2018 | 269,386 |
Term Loans, Amortized Cost Basis by Origination Year, 2017 | 372,720 |
Term Loans, Amortized Cost Basis by Origination Year, Prior | 998,690 |
Revolving Loans | 1,129,472 |
Revolving Loans Converted to Term Loans | 7,106 |
Notes Receivable Gross | 3,974,169 | 4,522,507
Residential Mortgage and Consumer [Member] | Performing [Member] |  |
Accounts Notes And Loans Receivable [Line Items] |  |
Term Loans, Amortized Cost Basis by Origination Year, 2021 | 330,316 |
Term Loans, Amortized Cost Basis by Origination Year, 2020 | 461,269 |
Term Loans, Amortized Cost Basis by Origination Year, 2019 | 401,774 |
Term Loans, Amortized Cost Basis by Origination Year, 2018 | 265,787 |
Term Loans, Amortized Cost Basis by Origination Year, 2017 | 367,106 |
Term Loans, Amortized Cost Basis by Origination Year, Prior | 973,576 |
Revolving Loans | 1,128,048 |
Revolving Loans Converted to Term Loans | 5,619 |
Notes Receivable Gross | 3,933,495 | 4,455,307
Residential Mortgage and Consumer [Member] | Nonperforming [Member] |  |
Accounts Notes And Loans Receivable [Line Items] |  |
Term Loans, Amortized Cost Basis by Origination Year, 2021 | 433 |
Term Loans, Amortized Cost Basis by Origination Year, 2020 | 1,101 |
Term Loans, Amortized Cost Basis by Origination Year, 2019 | 1,902 |
Term Loans, Amortized Cost Basis by Origination Year, 2018 | 3,599 |
Term Loans, Amortized Cost Basis by Origination Year, 2017 | 5,614 |
Term Loans, Amortized Cost Basis by Origination Year, Prior | 25,114 |
Revolving Loans | 1,424 |
Revolving Loans Converted to Term Loans | 1,487 |
Notes Receivable Gross | $ 40,674 | $ 67,200

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