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Loans and Allowance for Loan Losses (Credit Quality Indicators by Segments and Portfolio Class) (Details) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015 | Sep. 30, 2015
--- | --- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | $ 16,070,821 | $ 15,703,314 | $ 14,763,050
Total Commercial [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 11,972,654 | 11,560,325 |
Total Commercial [Member] | Pass [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 10,401,630 | 10,577,368 |
Total Commercial [Member] | Pass-Watch [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 314,912 | 221,911 |
Total Commercial [Member] | Special Mention [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 234,752 | 270,579 |
Total Commercial [Member] | Substandard [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 991,396 | 490,407 |
Total Commercial [Member] | Doubtful [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 29,964 | 60 |
Residential Mortgages [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 2,037,162 | 2,049,524 | 2,013,789
Consumer [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 2,061,005 | 2,093,465 | 1,990,296
Residential Mortgages and Consumer [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 4,098,167 | 4,142,989 |
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 1,990,309 | 1,553,082 | 1,484,232
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] | Pass [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 1,876,423 | 1,502,484 |
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] | Pass-Watch [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 69,773 | 14,717 |
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] | Special Mention [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 6,100 | 5,905 |
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] | Substandard [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 38,000 | 29,960 |
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] | Doubtful [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 13 | 16 |
Construction and Land Development [Member] | Total Commercial [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 946,592 | 1,151,950 | 1,085,585
Construction and Land Development [Member] | Total Commercial [Member] | Pass [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 904,550 | 1,095,296 |
Construction and Land Development [Member] | Total Commercial [Member] | Pass-Watch [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 21,945 | 6,841 |
Construction and Land Development [Member] | Total Commercial [Member] | Special Mention [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 198 | 12,297 |
Construction and Land Development [Member] | Total Commercial [Member] | Substandard [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 19,899 | 37,516 |
Total Commercial & Industrial [Member] | Total Commercial [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 9,035,753 | 8,855,293 | 8,189,148
Total Commercial & Industrial [Member] | Total Commercial [Member] | Pass [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 7,620,657 | 7,979,588 |
Total Commercial & Industrial [Member] | Total Commercial [Member] | Pass-Watch [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 223,194 | 200,353 |
Total Commercial & Industrial [Member] | Total Commercial [Member] | Special Mention [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 228,454 | 252,377 |
Total Commercial & Industrial [Member] | Total Commercial [Member] | Substandard [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 933,497 | 422,931 |
Total Commercial & Industrial [Member] | Total Commercial [Member] | Doubtful [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 29,951 | 44 |
Total Commercial & Industrial [Member] | Commercial Non-Real Estate [Member] | Total Commercial [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 7,133,928 | 6,995,824 | 6,345,994
Total Commercial & Industrial [Member] | Commercial Non-Real Estate [Member] | Total Commercial [Member] | Pass [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 5,899,626 | 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 | 180,467 | 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 | 196,408 | 211,230 |
Total Commercial & Industrial [Member] | Commercial Non-Real Estate [Member] | Total Commercial [Member] | Substandard [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 827,476 | 355,098 |
Total Commercial & Industrial [Member] | Commercial Non-Real Estate [Member] | Total Commercial [Member] | Doubtful [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 29,951 | 44 |
Total Commercial & Industrial [Member] | Commercial Real Estate - Owner Occupied [Member] | Total Commercial [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 1,901,825 | 1,859,469 | $ 1,843,154
Total Commercial & Industrial [Member] | Commercial Real Estate - Owner Occupied [Member] | Total Commercial [Member] | Pass [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 1,721,031 | 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 | 42,727 | 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 | 32,046 | 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 | 106,021 | 67,833 |
Performing [Member] | Residential Mortgages [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 2,015,981 | 2,025,563 |
Performing [Member] | Consumer [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 2,048,364 | 2,082,238 |
Performing [Member] | Residential Mortgages and Consumer [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 4,064,345 | 4,107,801 |
Nonperforming [Member] | Residential Mortgages [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 21,181 | 23,961 |
Nonperforming [Member] | Consumer [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 12,641 | 11,227 |
Nonperforming [Member] | Residential Mortgages and Consumer [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | $ 33,822 | $ 35,188 |

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