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Loans and Allowance for Loan Losses (Credit Quality Indicators by Segments and Portfolio Class) (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016 | Mar. 31, 2016
--- | --- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | $ 18,204,868 | $ 16,752,151 | $ 15,978,124
Total Commercial [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 13,879,509 | 12,545,507 |
Total Commercial [Member] | Pass [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 12,111,677 | 10,925,611 |
Total Commercial [Member] | Pass-Watch [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 577,334 | 351,888 |
Total Commercial [Member] | Special Mention [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 276,718 | 248,696 |
Total Commercial [Member] | Substandard [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 901,900 | 1,001,599 |
Total Commercial [Member] | Doubtful [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 11,880 | 17,713 |
Residential Mortgages [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 2,266,263 | 2,146,713 | 2,000,967
Consumer [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 2,059,096 | 2,059,931 | 2,060,245
Residential Mortgage and Consumer [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 4,325,359 | 4,206,644 |
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 2,505,104 | 2,013,890 | 1,752,745
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] | Pass [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 2,292,057 | 1,873,644 |
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] | Pass-Watch [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 141,063 | 78,309 |
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] | Special Mention [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 30,360 | 22,492 |
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] | Substandard [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 41,614 | 39,434 |
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] | Doubtful [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 10 | 11 |
Construction and Land Development [Member] | Total Commercial [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 1,252,667 | 1,010,879 | 1,095,414
Construction and Land Development [Member] | Total Commercial [Member] | Pass [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 1,139,772 | 968,505 |
Construction and Land Development [Member] | Total Commercial [Member] | Pass-Watch [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 93,309 | 22,592 |
Construction and Land Development [Member] | Total Commercial [Member] | Special Mention [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 8,311 | 4,142 |
Construction and Land Development [Member] | Total Commercial [Member] | Substandard [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 11,275 | 15,640 |
Total Commercial & Industrial [Member] | Total Commercial [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 10,121,738 | 9,520,738 | 9,068,753
Total Commercial & Industrial [Member] | Total Commercial [Member] | Pass [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 8,679,848 | 8,083,462 |
Total Commercial & Industrial [Member] | Total Commercial [Member] | Pass-Watch [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 342,962 | 250,987 |
Total Commercial & Industrial [Member] | Total Commercial [Member] | Special Mention [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 238,047 | 222,062 |
Total Commercial & Industrial [Member] | Total Commercial [Member] | Substandard [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 849,011 | 946,525 |
Total Commercial & Industrial [Member] | Total Commercial [Member] | Doubtful [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 11,870 | 17,702 |
Total Commercial & Industrial [Member] | Commercial Non-Real Estate [Member] | Total Commercial [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 8,074,287 | 7,613,917 | 7,145,406
Total Commercial & Industrial [Member] | Commercial Non-Real Estate [Member] | Total Commercial [Member] | Pass [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 6,839,049 | 6,364,348 |
Total Commercial & Industrial [Member] | Commercial Non-Real Estate [Member] | Total Commercial [Member] | Pass-Watch [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 296,914 | 203,311 |
Total Commercial & Industrial [Member] | Commercial Non-Real Estate [Member] | Total Commercial [Member] | Special Mention [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 182,128 | 181,763 |
Total Commercial & Industrial [Member] | Commercial Non-Real Estate [Member] | Total Commercial [Member] | Substandard [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 744,326 | 846,793 |
Total Commercial & Industrial [Member] | Commercial Non-Real Estate [Member] | Total Commercial [Member] | Doubtful [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 11,870 | 17,702 |
Total Commercial & Industrial [Member] | Commercial Real Estate - Owner Occupied [Member] | Total Commercial [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 2,047,451 | 1,906,821 | $ 1,923,347
Total Commercial & Industrial [Member] | Commercial Real Estate - Owner Occupied [Member] | Total Commercial [Member] | Pass [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 1,840,799 | 1,719,114 |
Total Commercial & Industrial [Member] | Commercial Real Estate - Owner Occupied [Member] | Total Commercial [Member] | Pass-Watch [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 46,048 | 47,676 |
Total Commercial & Industrial [Member] | Commercial Real Estate - Owner Occupied [Member] | Total Commercial [Member] | Special Mention [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 55,919 | 40,299 |
Total Commercial & Industrial [Member] | Commercial Real Estate - Owner Occupied [Member] | Total Commercial [Member] | Substandard [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 104,685 | 99,732 |
Performing [Member] | Residential Mortgages [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 2,243,251 | 2,123,048 |
Performing [Member] | Consumer [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 2,045,572 | 2,046,757 |
Performing [Member] | Residential Mortgage and Consumer [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 4,288,823 | 4,169,805 |
Nonperforming [Member] | Residential Mortgages [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 23,012 | 23,665 |
Nonperforming [Member] | Consumer [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 13,524 | 13,174 |
Nonperforming [Member] | Residential Mortgage and Consumer [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | $ 36,536 | $ 36,839 |

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