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Loans and Allowance for Loan Losses (Credit Quality Indicators by Segments and Portfolio Class) (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Total Commercial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | $ 14,574,273 | $ 14,198,396
Total Commercial [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 13,385,106 | 12,601,853
Total Commercial [Member] | Pass-Watch [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 355,312 | 520,230
Total Commercial [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 150,996 | 126,137
Total Commercial [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 682,839 | 950,111
Total Commercial [Member] | Doubtful [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 20 | 65
Residential Mortgages [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 2,846,916 | 2,690,472
Consumer [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 2,122,528 | 2,115,295
Residential Mortgage and Consumer [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 4,969,444 | 4,805,767
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 2,311,699 | 2,384,599
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 2,211,829 | 2,223,245
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] | Pass-Watch [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 46,155 | 83,444
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 26,086 | 13,244
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 27,629 | 64,658
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] | Doubtful [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans |  | 8
Construction and Land Development [Member] | Total Commercial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 1,523,419 | 1,373,421
Construction and Land Development [Member] | Total Commercial [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 1,473,080 | 1,291,638
Construction and Land Development [Member] | Total Commercial [Member] | Pass-Watch [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 37,100 | 60,804
Construction and Land Development [Member] | Total Commercial [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 952 | 4,788
Construction and Land Development [Member] | Total Commercial [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 12,287 | 16,191
Total Commercial And Industrial [Member] | Total Commercial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 10,739,155 | 10,440,376
Total Commercial And Industrial [Member] | Total Commercial [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 9,700,197 | 9,086,970
Total Commercial And Industrial [Member] | Total Commercial [Member] | Pass-Watch [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 272,057 | 375,982
Total Commercial And Industrial [Member] | Total Commercial [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 123,958 | 108,105
Total Commercial And Industrial [Member] | Total Commercial [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 642,923 | 869,262
Total Commercial And Industrial [Member] | Total Commercial [Member] | Doubtful [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 20 | 57
Total Commercial And Industrial [Member] | Commercial Non-Real Estate [Member] | Total Commercial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 8,438,884 | 8,297,937
Total Commercial And Industrial [Member] | Commercial Non-Real Estate [Member] | Total Commercial [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 7,593,629 | 7,190,604
Total Commercial And Industrial [Member] | Commercial Non-Real Estate [Member] | Total Commercial [Member] | Pass-Watch [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 201,226 | 293,069
Total Commercial And Industrial [Member] | Commercial Non-Real Estate [Member] | Total Commercial [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 89,825 | 80,649
Total Commercial And Industrial [Member] | Commercial Non-Real Estate [Member] | Total Commercial [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 554,184 | 733,558
Total Commercial And Industrial [Member] | Commercial Non-Real Estate [Member] | Total Commercial [Member] | Doubtful [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 20 | 57
Total Commercial And Industrial [Member] | Commercial Real Estate - Owner Occupied [Member] | Total Commercial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 2,300,271 | 2,142,439
Total Commercial And Industrial [Member] | Commercial Real Estate - Owner Occupied [Member] | Total Commercial [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 2,106,568 | 1,896,366
Total Commercial And Industrial [Member] | Commercial Real Estate - Owner Occupied [Member] | Total Commercial [Member] | Pass-Watch [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 70,831 | 82,913
Total Commercial And Industrial [Member] | Commercial Real Estate - Owner Occupied [Member] | Total Commercial [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 34,133 | 27,456
Total Commercial And Industrial [Member] | Commercial Real Estate - Owner Occupied [Member] | Total Commercial [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 88,739 | 135,704
Performing [Member] | Residential Mortgages [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 2,815,184 | 2,647,784
Performing [Member] | Consumer [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 2,106,581 | 2,099,637
Performing [Member] | Residential Mortgage and Consumer [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 4,921,765 | 4,747,421
Nonperforming [Member] | Residential Mortgages [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 31,732 | 42,688
Nonperforming [Member] | Consumer [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 15,947 | 15,658
Nonperforming [Member] | Residential Mortgage and Consumer [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | $ 47,679 | $ 58,346

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