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Loans and Allowance for Loan Losses (Credit Quality Indicators by Segments and Portfolio Class) (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Total Commercial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | $ 14,502,180 | $ 14,198,396
Total Commercial [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 13,216,568 | 12,601,853
Total Commercial [Member] | Pass-Watch [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 388,223 | 520,230
Total Commercial [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 113,391 | 126,137
Total Commercial [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 783,981 | 950,111
Total Commercial [Member] | Doubtful [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 17 | 65
Residential Mortgages [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 2,780,359 | 2,690,472
Consumer [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 2,088,378 | 2,115,295
Residential Mortgage and Consumer [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 4,868,737 | 4,805,767
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 2,342,192 | 2,384,599
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 2,242,250 | 2,223,245
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] | Pass-Watch [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 38,906 | 83,444
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 8,982 | 13,244
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 52,054 | 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 | 1,515,233 | 1,373,421
Construction and Land Development [Member] | Total Commercial [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 1,441,146 | 1,291,638
Construction and Land Development [Member] | Total Commercial [Member] | Pass-Watch [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 56,240 | 60,804
Construction and Land Development [Member] | Total Commercial [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 7,434 | 4,788
Construction and Land Development [Member] | Total Commercial [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 10,413 | 16,191
Total Commercial And Industrial [Member] | Total Commercial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 10,644,755 | 10,440,376
Total Commercial And Industrial [Member] | Total Commercial [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 9,533,172 | 9,086,970
Total Commercial And Industrial [Member] | Total Commercial [Member] | Pass-Watch [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 293,077 | 375,982
Total Commercial And Industrial [Member] | Total Commercial [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 96,975 | 108,105
Total Commercial And Industrial [Member] | Total Commercial [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 721,514 | 869,262
Total Commercial And Industrial [Member] | Total Commercial [Member] | Doubtful [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 17 | 57
Total Commercial And Industrial [Member] | Commercial Non-Real Estate [Member] | Total Commercial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 8,410,961 | 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 | 7,492,452 | 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 | 249,892 | 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 | 70,464 | 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 | 598,136 | 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 | 17 | 57
Total Commercial And Industrial [Member] | Commercial Real Estate - Owner Occupied [Member] | Total Commercial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 2,233,794 | 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 | 2,040,720 | 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 | 43,185 | 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 | 26,511 | 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 | 123,378 | 135,704
Performing [Member] | Residential Mortgages [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 2,748,848 | 2,647,784
Performing [Member] | Consumer [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 2,073,528 | 2,099,637
Performing [Member] | Residential Mortgage and Consumer [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 4,822,376 | 4,747,421
Nonperforming [Member] | Residential Mortgages [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 31,511 | 42,688
Nonperforming [Member] | Consumer [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 14,850 | 15,658
Nonperforming [Member] | Residential Mortgage and Consumer [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | $ 46,361 | $ 58,346

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