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Loans and Allowance for Loan Losses (Age Analysis of Past Due Loans by Portfolio Class) (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017
--- | --- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | $ 291,773 | $ 327,349 |
Current | 19,251,944 | 18,676,814 |
Total loans | 19,543,717 | 19,004,163 | $ 18,786,285
Recorded Investment > 90 Days and Accruing | 30,526 | 27,766 |
30-59 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 77,484 | 137,267 |
60-89 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 45,538 | 33,000 |
Greater Than 90 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 168,751 | 157,082 |
Total Commercial And Industrial [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 172,834 |  |
Current | 10,566,321 |  |
Total loans | 10,739,155 |  |
Recorded Investment > 90 Days and Accruing | 28,247 |  |
Total Commercial And Industrial [Member] | 30-59 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 12,753 |  |
Total Commercial And Industrial [Member] | 60-89 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 26,913 |  |
Total Commercial And Industrial [Member] | Greater Than 90 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 133,168 |  |
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 8,110 | 13,561 |
Current | 2,303,589 | 2,371,038 |
Total loans | 2,311,699 | 2,384,599 | 2,511,808
Recorded Investment > 90 Days and Accruing | 1,830 | 489 |
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 | 1,541 | 5,315 |
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 | 198 | 2,165 |
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 | 6,371 | 6,081 |
Total Commercial [Member] | Construction and Land Development [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 15,552 | 8,581 |
Current | 1,507,867 | 1,364,840 |
Total loans | 1,523,419 | 1,373,421 | 1,373,048
Recorded Investment > 90 Days and Accruing | 78 | 477 |
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 | 11,976 | 4,113 |
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 | 1,532 | 1,056 |
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 | 2,044 | 3,412 |
Total Commercial [Member] | Total Commercial And Industrial [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due |  | 191,167 |
Current |  | 10,249,209 |
Total loans | 10,739,155 | 10,440,376 | 10,205,443
Recorded Investment > 90 Days and Accruing |  | 24,021 |
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 |  | 71,259 |
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 |  | 11,409 |
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 |  | 108,499 |
Total Commercial [Member] | Total Commercial And Industrial [Member] | Commercial Non-Real Estate [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 153,997 | 166,509 |
Current | 8,284,887 | 8,131,428 |
Total loans | 8,438,884 | 8,297,937 | 8,129,429
Recorded Investment > 90 Days and Accruing | 27,606 | 21,989 |
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 | 10,752 | 62,766 |
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 | 26,454 | 10,761 |
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 | 116,791 | 92,982 |
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 | 18,837 | 24,658 |
Current | 2,281,434 | 2,117,781 |
Total loans | 2,300,271 | 2,142,439 | 2,076,014
Recorded Investment > 90 Days and Accruing | 641 | 2,032 |
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 | 2,001 | 8,493 |
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 | 459 | 648 |
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 | 16,377 | 15,517 |
Residential Mortgages [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 66,614 | 74,712 |
Current | 2,780,302 | 2,615,760 |
Total loans | 2,846,916 | 2,690,472 | 2,596,692
Recorded Investment > 90 Days and Accruing |  | 2,208 |
Residential Mortgages [Member] | 30-59 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 36,632 | 33,621 |
Residential Mortgages [Member] | 60-89 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 11,976 | 10,554 |
Residential Mortgages [Member] | Greater Than 90 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 18,006 | 30,537 |
Consumer [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 28,663 | 39,328 |
Current | 2,093,865 | 2,075,967 |
Total loans | 2,122,528 | 2,115,295 | $ 2,099,294
Recorded Investment > 90 Days and Accruing | 371 | 571 |
Consumer [Member] | 30-59 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 14,582 | 22,959 |
Consumer [Member] | 60-89 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 4,919 | 7,816 |
Consumer [Member] | Greater Than 90 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | $ 9,162 | $ 8,553 |

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