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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, 2020 | Dec. 31, 2019 | Sep. 30, 2019
--- | --- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | $ 218,965 | $ 260,818 |
Current | 22,021,239 | 20,951,937 |
Total loans | 22,240,204 | 21,212,755 | $ 21,035,952
Recorded Investment > 90 Days and Accruing | 10,439 | 6,582 |
30-59 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 20,417 | 83,693 |
60-89 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 63,428 | 30,183 |
Greater Than 90 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 135,120 | 146,942 |
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 39,104 | 4,351 |
Current | 3,367,450 | 2,990,097 |
Total loans | 3,406,554 | 2,994,448 | 3,060,568
Recorded Investment > 90 Days and Accruing | 2,490 | 450 |
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member] | 30-59 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 165 | 738 |
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member] | 60-89 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 30,238 | 703 |
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 Past Due | 8,701 | 2,910 |
Total Commercial [Member] | Construction and Land Development [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 4,491 | 8,907 |
Current | 1,091,658 | 1,148,544 |
Total loans | 1,096,149 | 1,157,451 | 1,190,718
Recorded Investment > 90 Days and Accruing | 393 | 2,042 |
Total Commercial [Member] | Construction and Land Development [Member] | 30-59 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 1,076 | 5,747 |
Total Commercial [Member] | Construction and Land Development [Member] | 60-89 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 237 | 680 |
Total Commercial [Member] | Construction and Land Development [Member] | Greater Than 90 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 3,178 | 2,480 |
Total Commercial [Member] | Total Commercial And Industrial [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 100,527 | 147,830 |
Current | 12,936,668 | 11,757,577 |
Total loans | 13,037,195 | 11,905,407 | 11,627,383
Recorded Investment > 90 Days and Accruing | 5,223 | 2,367 |
Total Commercial [Member] | Total Commercial And Industrial [Member] | 30-59 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 6,561 | 25,755 |
Total Commercial [Member] | Total Commercial And Industrial [Member] | 60-89 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 16,553 | 14,001 |
Total Commercial [Member] | Total Commercial And Industrial [Member] | Greater Than 90 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 77,413 | 108,074 |
Total Commercial [Member] | Total Commercial And Industrial [Member] | Commercial Non-Real Estate [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 86,008 | 135,144 |
Current | 10,171,780 | 9,031,803 |
Total loans | 10,257,788 | 9,166,947 | 8,893,004
Recorded Investment > 90 Days and Accruing | 5,110 | 1,537 |
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 Past Due | 6,026 | 20,893 |
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 Past Due | 14,277 | 13,445 |
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 Past Due | 65,705 | 100,806 |
Total Commercial [Member] | Total Commercial And Industrial [Member] | Commercial Real Estate - Owner Occupied [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 14,519 | 12,686 |
Current | 2,764,888 | 2,725,774 |
Total loans | 2,779,407 | 2,738,460 | 2,734,379
Recorded Investment > 90 Days and Accruing | 113 | 830 |
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 Past Due | 535 | 4,862 |
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 Past Due | 2,276 | 556 |
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 Past Due | 11,708 | 7,268 |
Residential Mortgages [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 47,851 | 65,028 |
Current | 2,706,537 | 2,925,603 |
Total loans | 2,754,388 | 2,990,631 | 3,004,958
Recorded Investment > 90 Days and Accruing | 1,818 | 85 |
Residential Mortgages [Member] | 30-59 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 3,164 | 32,867 |
Residential Mortgages [Member] | 60-89 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 11,779 | 8,584 |
Residential Mortgages [Member] | Greater Than 90 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 32,908 | 23,577 |
Consumer [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 26,992 | 34,702 |
Current | 1,918,926 | 2,130,116 |
Total loans | 1,945,918 | 2,164,818 | $ 2,152,325
Recorded Investment > 90 Days and Accruing | 515 | 1,638 |
Consumer [Member] | 30-59 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 9,451 | 18,586 |
Consumer [Member] | 60-89 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 4,621 | 6,215 |
Consumer [Member] | Greater Than 90 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | $ 12,920 | $ 9,901 |

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