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Loans and Allowance for Loan Losses (Credit Quality Indicators by Segments and Portfolio Class) (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Total Commercial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | $ 14,330,505 | $ 14,198,396
Total Commercial [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 12,807,913 | 12,601,853
Total Commercial [Member] | Pass-Watch [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 438,813 | 520,230
Total Commercial [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 151,599 | 126,137
Total Commercial [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 932,162 | 950,111
Total Commercial [Member] | Doubtful [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 18 | 65
Residential Mortgages [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 2,732,821 | 2,690,472
Consumer [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 2,029,178 | 2,115,295
Residential Mortgage and Consumer [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 4,761,999 | 4,805,767
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 2,394,862 | 2,384,599
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 2,268,358 | 2,223,245
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] | Pass-Watch [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 58,092 | 83,444
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 9,344 | 13,244
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 59,068 | 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 | 1,413,878 | 1,373,421
Construction and Land Development [Member] | Total Commercial [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 1,334,456 | 1,291,638
Construction and Land Development [Member] | Total Commercial [Member] | Pass-Watch [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 59,208 | 60,804
Construction and Land Development [Member] | Total Commercial [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 6,279 | 4,788
Construction and Land Development [Member] | Total Commercial [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 13,935 | 16,191
Total Commercial And Industrial [Member] | Total Commercial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 10,521,765 | 10,440,376
Total Commercial And Industrial [Member] | Total Commercial [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 9,205,099 | 9,086,970
Total Commercial And Industrial [Member] | Total Commercial [Member] | Pass-Watch [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 321,513 | 375,982
Total Commercial And Industrial [Member] | Total Commercial [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 135,976 | 108,105
Total Commercial And Industrial [Member] | Total Commercial [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 859,159 | 869,262
Total Commercial And Industrial [Member] | Total Commercial [Member] | Doubtful [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 18 | 57
Total Commercial And Industrial [Member] | Commercial Non-Real Estate [Member] | Total Commercial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 8,336,222 | 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 | 7,250,715 | 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 | 269,657 | 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 | 100,005 | 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 | 715,827 | 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 | 18 | 57
Total Commercial And Industrial [Member] | Commercial Real Estate - Owner Occupied [Member] | Total Commercial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 2,185,543 | 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 | 1,954,384 | 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 | 51,856 | 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 | 35,971 | 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 | 143,332 | 135,704
Performing [Member] | Residential Mortgages [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 2,696,582 | 2,647,784
Performing [Member] | Consumer [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 2,014,442 | 2,099,637
Performing [Member] | Residential Mortgage and Consumer [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 4,711,024 | 4,747,421
Nonperforming [Member] | Residential Mortgages [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 36,239 | 42,688
Nonperforming [Member] | Consumer [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 14,736 | 15,658
Nonperforming [Member] | Residential Mortgage and Consumer [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | $ 50,975 | $ 58,346

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