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Loans and Allowance for Credit Losses (Aging Analysis of Past Due Loans by Portfolio Class) (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020
--- | --- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total loans | $ 20,886,015 | $ 21,789,931 | $ 22,240,204
Recorded Investment > 90 Days and Accruing | 9,970 | 3,361 |
30-59 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total loans | 30,477 | 56,684 |
60-89 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total loans | 13,756 | 19,269 |
Greater Than 90 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total loans | 47,490 | 100,538 |
Total Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total loans | 91,723 | 176,491 |
Current [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total loans | 20,794,292 | 21,613,440 |
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total loans | 3,467,939 | 3,357,939 | 3,406,554
Recorded Investment > 90 Days and Accruing | 1,346 | 182 |
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member] | 30-59 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total loans | 1,175 | 1,494 |
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member] | 60-89 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total loans | 1,474 | 798 |
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member] | Greater Than 90 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total loans | 5,441 | 5,744 |
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member] | Total Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total loans | 8,090 | 8,036 |
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member] | Current [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total loans | 3,459,849 | 3,349,903 |
Total Commercial [Member] | Construction and Land Development [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total loans | 1,213,991 | 1,065,057 | 1,096,149
Recorded Investment > 90 Days and Accruing | 57 |  |
Total Commercial [Member] | Construction and Land Development [Member] | 30-59 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total loans | 369 | 4,168 |
Total Commercial [Member] | Construction and Land Development [Member] | 60-89 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total loans | 733 | 284 |
Total Commercial [Member] | Construction and Land Development [Member] | Greater Than 90 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total loans | 1,035 | 2,001 |
Total Commercial [Member] | Construction and Land Development [Member] | Total Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total loans | 2,137 | 6,453 |
Total Commercial [Member] | Construction and Land Development [Member] | Current [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total loans | 1,211,854 | 1,058,604 |
Total Commercial [Member] | Total Commercial And Industrial [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total loans | 12,229,916 | 12,844,428 | 13,037,195
Recorded Investment > 90 Days and Accruing | 7,370 | 1,538 |
Total Commercial [Member] | Total Commercial And Industrial [Member] | 30-59 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total loans | 11,384 | 9,488 |
Total Commercial [Member] | Total Commercial And Industrial [Member] | 60-89 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total loans | 2,862 | 3,317 |
Total Commercial [Member] | Total Commercial And Industrial [Member] | Greater Than 90 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total loans | 16,116 | 53,193 |
Total Commercial [Member] | Total Commercial And Industrial [Member] | Total Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total loans | 30,362 | 65,998 |
Total Commercial [Member] | Total Commercial And Industrial [Member] | Current [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total loans | 12,199,554 | 12,778,430 |
Total Commercial [Member] | Total Commercial And Industrial [Member] | Commercial Non-Real Estate [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total loans | 9,416,990 | 9,986,983 | 10,257,788
Recorded Investment > 90 Days and Accruing | 7,228 | 583 |
Total Commercial [Member] | Total Commercial And Industrial [Member] | Commercial Non-Real Estate [Member] | 30-59 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total loans | 5,623 | 7,963 |
Total Commercial [Member] | Total Commercial And Industrial [Member] | Commercial Non-Real Estate [Member] | 60-89 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total loans | 2,100 | 2,564 |
Total Commercial [Member] | Total Commercial And Industrial [Member] | Commercial Non-Real Estate [Member] | Greater Than 90 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total loans | 14,568 | 39,530 |
Total Commercial [Member] | Total Commercial And Industrial [Member] | Commercial Non-Real Estate [Member] | Total Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total loans | 22,291 | 50,057 |
Total Commercial [Member] | Total Commercial And Industrial [Member] | Commercial Non-Real Estate [Member] | Current [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total loans | 9,394,699 | 9,936,926 |
Total Commercial [Member] | Total Commercial And Industrial [Member] | Commercial Real Estate - Owner Occupied [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total loans | 2,812,926 | 2,857,445 | 2,779,407
Recorded Investment > 90 Days and Accruing | 142 | 955 |
Total Commercial [Member] | Total Commercial And Industrial [Member] | Commercial Real Estate - Owner Occupied [Member] | 30-59 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total loans | 5,761 | 1,525 |
Total Commercial [Member] | Total Commercial And Industrial [Member] | Commercial Real Estate - Owner Occupied [Member] | 60-89 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total loans | 762 | 753 |
Total Commercial [Member] | Total Commercial And Industrial [Member] | Commercial Real Estate - Owner Occupied [Member] | Greater Than 90 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total loans | 1,548 | 13,663 |
Total Commercial [Member] | Total Commercial And Industrial [Member] | Commercial Real Estate - Owner Occupied [Member] | Total Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total loans | 8,071 | 15,941 |
Total Commercial [Member] | Total Commercial And Industrial [Member] | Commercial Real Estate - Owner Occupied [Member] | Current [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total loans | 2,804,855 | 2,841,504 |
Residential Mortgages [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total loans | 2,351,053 | 2,665,212 | 2,754,388
Recorded Investment > 90 Days and Accruing | 254 | 912 |
Residential Mortgages [Member] | 30-59 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total loans | 3,799 | 29,319 |
Residential Mortgages [Member] | 60-89 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total loans | 5,579 | 9,858 |
Residential Mortgages [Member] | Greater Than 90 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total loans | 17,567 | 27,886 |
Residential Mortgages [Member] | Total Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total loans | 26,945 | 67,063 |
Residential Mortgages [Member] | Current [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total loans | 2,324,108 | 2,598,149 |
Consumer [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total loans | 1,623,116 | 1,857,295 | $ 1,945,918
Recorded Investment > 90 Days and Accruing | 943 | 729 |
Consumer [Member] | 30-59 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total loans | 13,750 | 12,215 |
Consumer [Member] | 60-89 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total loans | 3,108 | 5,012 |
Consumer [Member] | Greater Than 90 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total loans | 7,331 | 11,714 |
Consumer [Member] | Total Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total loans | 24,189 | 28,941 |
Consumer [Member] | Current [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total loans | $ 1,598,927 | $ 1,828,354 |

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