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Loans and Allowance for Loan Losses (Age Analysis of Past Due Loans by Portfolio Class) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | $ 327,349 | $ 195,107
Current | 18,676,814 | 16,557,044
Total loans | 19,004,163 | 16,752,151
Recorded Investment > 90 Days and Accruing | 27,766 | 3,039
30-59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 137,267 | 67,482
60-89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 33,000 | 18,968
Greater Than 90 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 157,082 | 108,657
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 13,561 | 5,914
Current | 2,371,038 | 2,007,976
Total loans | 2,384,599 | 2,013,890
Recorded Investment > 90 Days and Accruing | 489 | 216
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 | 5,315 | 838
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 | 2,165 | 50
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 | 6,081 | 5,026
Total Commercial [Member] | Construction and Land Development [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 8,581 | 6,165
Current | 1,364,840 | 1,004,714
Total loans | 1,373,421 | 1,010,879
Recorded Investment > 90 Days and Accruing | 477 | 1,563
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 | 4,113 | 694
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 | 1,056 | 171
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 | 3,412 | 5,300
Total Commercial [Member] | Total Commercial And Industrial [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 191,167 | 100,035
Current | 10,249,209 | 9,420,703
Total loans | 10,440,376 | 9,520,738
Recorded Investment > 90 Days and Accruing | 24,021 | 436
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 | 22,730
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 | 2,490
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 | 74,815
Total Commercial [Member] | Total Commercial And Industrial [Member] | Commercial Non-Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 166,509 | 90,136
Current | 8,131,428 | 7,523,781
Total loans | 8,297,937 | 7,613,917
Recorded Investment > 90 Days and Accruing | 21,989 | 384
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 | 62,766 | 19,722
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 | 10,761 | 1,909
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 | 92,982 | 68,505
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 | 24,658 | 9,899
Current | 2,117,781 | 1,896,922
Total loans | 2,142,439 | 1,906,821
Recorded Investment > 90 Days and Accruing | 2,032 | 52
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 | 8,493 | 3,008
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 | 648 | 581
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 | 15,517 | 6,310
Residential Mortgages [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 74,712 | 47,784
Current | 2,615,760 | 2,098,929
Total loans | 2,690,472 | 2,146,713
Recorded Investment > 90 Days and Accruing | 2,208 | 1
Residential Mortgages [Member] | 30-59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 33,621 | 24,599
Residential Mortgages [Member] | 60-89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 10,554 | 8,816
Residential Mortgages [Member] | Greater Than 90 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 30,537 | 14,369
Consumer [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 39,328 | 35,209
Current | 2,075,967 | 2,024,722
Total loans | 2,115,295 | 2,059,931
Recorded Investment > 90 Days and Accruing | 571 | 823
Consumer [Member] | 30-59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 22,959 | 18,621
Consumer [Member] | 60-89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 7,816 | 7,441
Consumer [Member] | Greater Than 90 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | $ 8,553 | $ 9,147

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