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Loans (Credit Quality Indicators by Segments and Portfolio Class) (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | $ 16,752,151 | $ 15,703,314
Total Commercial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 12,545,507 | 11,560,325
Total Commercial [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 10,925,611 | 10,577,368
Total Commercial [Member] | Pass-Watch [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 351,888 | 221,911
Total Commercial [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 248,696 | 270,579
Total Commercial [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 1,001,599 | 490,407
Total Commercial [Member] | Doubtful [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 17,713 | 60
Residential Mortgages [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 2,146,713 | 2,049,524
Consumer [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 2,059,931 | 2,093,465
Residential Mortgage and Consumer [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 4,206,644 | 4,142,989
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 2,013,890 | 1,553,082
Investor Real Estate [Member] | Total Commercial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 2,013,890 | 1,553,082
Investor Real Estate [Member] | Total Commercial [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 1,873,644 | 1,502,484
Investor Real Estate [Member] | Total Commercial [Member] | Pass-Watch [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 78,309 | 14,717
Investor Real Estate [Member] | Total Commercial [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 22,492 | 5,905
Investor Real Estate [Member] | Total Commercial [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 39,434 | 29,960
Investor Real Estate [Member] | Total Commercial [Member] | Doubtful [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 11 | 16
Construction and Land Development [Member] | Total Commercial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 1,010,879 | 1,151,950
Construction and Land Development [Member] | Total Commercial [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 968,505 | 1,095,296
Construction and Land Development [Member] | Total Commercial [Member] | Pass-Watch [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 22,592 | 6,841
Construction and Land Development [Member] | Total Commercial [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 4,142 | 12,297
Construction and Land Development [Member] | Total Commercial [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 15,640 | 37,516
Total Commercial & Industrial [Member] | Total Commercial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 9,520,738 | 8,855,293
Total Commercial & Industrial [Member] | Total Commercial [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 8,083,462 | 7,979,588
Total Commercial & Industrial [Member] | Total Commercial [Member] | Pass-Watch [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 250,987 | 200,353
Total Commercial & Industrial [Member] | Total Commercial [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 222,062 | 252,377
Total Commercial & Industrial [Member] | Total Commercial [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 946,525 | 422,931
Total Commercial & Industrial [Member] | Total Commercial [Member] | Doubtful [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 17,702 | 44
Total Commercial & Industrial [Member] | Commercial Non-Real Estate [Member] | Total Commercial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 7,613,917 | 6,995,824
Total Commercial & Industrial [Member] | Commercial Non-Real Estate [Member] | Total Commercial [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 6,364,348 | 6,260,863
Total Commercial & Industrial [Member] | Commercial Non-Real Estate [Member] | Total Commercial [Member] | Pass-Watch [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 203,311 | 168,589
Total Commercial & Industrial [Member] | Commercial Non-Real Estate [Member] | Total Commercial [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 181,763 | 211,230
Total Commercial & Industrial [Member] | Commercial Non-Real Estate [Member] | Total Commercial [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 846,793 | 355,098
Total Commercial & Industrial [Member] | Commercial Non-Real Estate [Member] | Total Commercial [Member] | Doubtful [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 17,702 | 44
Total Commercial & Industrial [Member] | Commercial Real Estate - Owner Occupied [Member] | Total Commercial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 1,906,821 | 1,859,469
Total Commercial & Industrial [Member] | Commercial Real Estate - Owner Occupied [Member] | Total Commercial [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 1,719,114 | 1,718,725
Total Commercial & Industrial [Member] | Commercial Real Estate - Owner Occupied [Member] | Total Commercial [Member] | Pass-Watch [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 47,676 | 31,764
Total Commercial & Industrial [Member] | Commercial Real Estate - Owner Occupied [Member] | Total Commercial [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 40,299 | 41,147
Total Commercial & Industrial [Member] | Commercial Real Estate - Owner Occupied [Member] | Total Commercial [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 99,732 | 67,833
Performing [Member] | Residential Mortgages [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 2,123,048 | 2,025,563
Performing [Member] | Consumer [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 2,046,757 | 2,082,238
Performing [Member] | Residential Mortgage and Consumer [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 4,169,805 | 4,107,801
Nonperforming [Member] | Residential Mortgages [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 23,665 | 23,961
Nonperforming [Member] | Consumer [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 13,174 | 11,227
Nonperforming [Member] | Residential Mortgage and Consumer [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | $ 36,839 | $ 35,188

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