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Loans and Allowance for Credit Losses (Disaggregation of Credit Quality Disclosures) (Details) - USD ($) $ in Thousands | Mar. 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 | $ 1,272,817 |
Term Loans, Amortized Cost Basis by Origination Year, 2019 | 3,633,698 |
Term Loans, Amortized Cost Basis by Origination Year, 2018 | 2,478,292 |
Term Loans, Amortized Cost Basis by Origination Year, 2017 | 1,948,787 |
Term Loans, Amortized Cost Basis by Origination Year, 2016 | 1,345,235 |
Term Loans, Amortized Cost Basis by Origination Year, Prior | 1,930,274 |
Revolving Loans | 3,711,322 |
Revolving Loans Converted to Term Loans | 63,744 |
Notes Receivable Gross | 16,384,169 | $ 16,057,306
Total Commercial [Member] | Pass [Member] |  |
Accounts Notes And Loans Receivable [Line Items] |  |
Term Loans, Amortized Cost Basis by Origination Year, 2020 | 1,200,289 |
Term Loans, Amortized Cost Basis by Origination Year, 2019 | 3,482,650 |
Term Loans, Amortized Cost Basis by Origination Year, 2018 | 2,316,675 |
Term Loans, Amortized Cost Basis by Origination Year, 2017 | 1,817,884 |
Term Loans, Amortized Cost Basis by Origination Year, 2016 | 1,268,500 |
Term Loans, Amortized Cost Basis by Origination Year, Prior | 1,815,527 |
Revolving Loans | 3,166,739 |
Revolving Loans Converted to Term Loans | 40,805 |
Notes Receivable Gross | 15,109,069 | 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 | 45,483 |
Term Loans, Amortized Cost Basis by Origination Year, 2019 | 89,492 |
Term Loans, Amortized Cost Basis by Origination Year, 2018 | 50,169 |
Term Loans, Amortized Cost Basis by Origination Year, 2017 | 73,719 |
Term Loans, Amortized Cost Basis by Origination Year, 2016 | 45,264 |
Term Loans, Amortized Cost Basis by Origination Year, Prior | 45,098 |
Revolving Loans | 393,676 |
Revolving Loans Converted to Term Loans | 2,068 |
Notes Receivable Gross | 744,969 | 462,502
Total Commercial [Member] | Special Mention [Member] |  |
Accounts Notes And Loans Receivable [Line Items] |  |
Term Loans, Amortized Cost Basis by Origination Year, 2020 | 1,106 |
Term Loans, Amortized Cost Basis by Origination Year, 2019 | 2,754 |
Term Loans, Amortized Cost Basis by Origination Year, 2018 | 11,838 |
Term Loans, Amortized Cost Basis by Origination Year, 2017 | 26,324 |
Term Loans, Amortized Cost Basis by Origination Year, 2016 | 699 |
Term Loans, Amortized Cost Basis by Origination Year, Prior | 20,130 |
Revolving Loans | 21,204 |
Revolving Loans Converted to Term Loans | 1,319 |
Notes Receivable Gross | 85,374 | 101,583
Total Commercial [Member] | Substandard [Member] |  |
Accounts Notes And Loans Receivable [Line Items] |  |
Term Loans, Amortized Cost Basis by Origination Year, 2020 | 25,939 |
Term Loans, Amortized Cost Basis by Origination Year, 2019 | 58,802 |
Term Loans, Amortized Cost Basis by Origination Year, 2018 | 86,630 |
Term Loans, Amortized Cost Basis by Origination Year, 2017 | 30,860 |
Term Loans, Amortized Cost Basis by Origination Year, 2016 | 30,772 |
Term Loans, Amortized Cost Basis by Origination Year, Prior | 49,519 |
Revolving Loans | 127,734 |
Revolving Loans Converted to Term Loans | 19,552 |
Notes Receivable Gross | 429,808 | 479,110
Total Commercial [Member] | Doubtful [Member] |  |
Accounts Notes And Loans Receivable [Line Items] |  |
Term Loans, Amortized Cost Basis by Origination Year, 2018 | 12,980 |
Revolving Loans | 1,969 |
Notes Receivable Gross | 14,949 |
Residential Mortgage and Consumer [Member] |  |
Accounts Notes And Loans Receivable [Line Items] |  |
Term Loans, Amortized Cost Basis by Origination Year, 2020 | 172,950 |
Term Loans, Amortized Cost Basis by Origination Year, 2019 | 530,795 |
Term Loans, Amortized Cost Basis by Origination Year, 2018 | 581,487 |
Term Loans, Amortized Cost Basis by Origination Year, 2017 | 778,524 |
Term Loans, Amortized Cost Basis by Origination Year, 2016 | 626,671 |
Term Loans, Amortized Cost Basis by Origination Year, Prior | 1,137,938 |
Revolving Loans | 1,297,415 |
Revolving Loans Converted to Term Loans | 5,732 |
Notes Receivable Gross | 5,131,512 | 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 | 172,403 |
Term Loans, Amortized Cost Basis by Origination Year, 2019 | 528,274 |
Term Loans, Amortized Cost Basis by Origination Year, 2018 | 577,525 |
Term Loans, Amortized Cost Basis by Origination Year, 2017 | 771,724 |
Term Loans, Amortized Cost Basis by Origination Year, 2016 | 622,557 |
Term Loans, Amortized Cost Basis by Origination Year, Prior | 1,096,363 |
Revolving Loans | 1,295,598 |
Revolving Loans Converted to Term Loans | 4,256 |
Notes Receivable Gross | 5,068,700 | 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 | 547 |
Term Loans, Amortized Cost Basis by Origination Year, 2019 | 2,521 |
Term Loans, Amortized Cost Basis by Origination Year, 2018 | 3,962 |
Term Loans, Amortized Cost Basis by Origination Year, 2017 | 6,800 |
Term Loans, Amortized Cost Basis by Origination Year, 2016 | 4,114 |
Term Loans, Amortized Cost Basis by Origination Year, Prior | 41,575 |
Revolving Loans | 1,817 |
Revolving Loans Converted to Term Loans | 1,476 |
Notes Receivable Gross | $ 62,812 | $ 57,283

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