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Loans and Allowance for Loan Losses (Credit Quality Indicators by Segments and Portfolio Class) (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Total Commercial [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | $ 15,075,215 | $ 14,968,463
Total Commercial [Member] | Total Commercial And Industrial [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 11,171,754 | 11,078,349
Total Commercial [Member] | Pass [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 14,141,690 | 13,902,485
Total Commercial [Member] | Pass [Member] | Total Commercial And Industrial [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 10,371,654 | 10,149,799
Total Commercial [Member] | Pass-Watch [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 349,301 | 440,415
Total Commercial [Member] | Pass-Watch [Member] | Total Commercial And Industrial [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 257,840 | 344,781
Total Commercial [Member] | Special Mention [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 90,639 | 105,227
Total Commercial [Member] | Special Mention [Member] | Total Commercial And Industrial [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 78,989 | 98,901
Total Commercial [Member] | Substandard [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 493,585 | 520,336
Total Commercial [Member] | Substandard [Member] | Total Commercial And Industrial [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 463,271 | 484,868
Residential Mortgages [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 2,933,251 | 2,910,081
Residential Mortgages [Member] | Performing [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 2,893,635 | 2,873,669
Residential Mortgages [Member] | Nonperforming [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 39,616 | 36,412
Consumer [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 2,104,372 | 2,147,867
Consumer [Member] | Performing [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 2,085,456 | 2,130,395
Consumer [Member] | Nonperforming [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 18,916 | 17,472
Residential Mortgage and Consumer [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 5,037,623 | 5,057,948
Residential Mortgage and Consumer [Member] | Performing [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 4,979,091 | 5,004,064
Residential Mortgage and Consumer [Member] | Nonperforming [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 58,532 | 53,884
Commercial Non-Real Estate [Member] | Total Commercial [Member] | Total Commercial And Industrial [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 8,656,326 | 8,620,601
Commercial Non-Real Estate [Member] | Total Commercial [Member] | Pass [Member] | Total Commercial And Industrial [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 8,028,706 | 7,875,588
Commercial Non-Real Estate [Member] | Total Commercial [Member] | Pass-Watch [Member] | Total Commercial And Industrial [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 166,406 | 260,510
Commercial Non-Real Estate [Member] | Total Commercial [Member] | Special Mention [Member] | Total Commercial And Industrial [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 62,830 | 75,752
Commercial Non-Real Estate [Member] | Total Commercial [Member] | Substandard [Member] | Total Commercial And Industrial [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 398,384 | 408,751
Commercial Real Estate - Owner Occupied [Member] | Total Commercial [Member] | Total Commercial And Industrial [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 2,515,428 | 2,457,748
Commercial Real Estate - Owner Occupied [Member] | Total Commercial [Member] | Pass [Member] | Total Commercial And Industrial [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 2,342,948 | 2,274,211
Commercial Real Estate - Owner Occupied [Member] | Total Commercial [Member] | Pass-Watch [Member] | Total Commercial And Industrial [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 91,434 | 84,271
Commercial Real Estate - Owner Occupied [Member] | Total Commercial [Member] | Special Mention [Member] | Total Commercial And Industrial [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 16,159 | 23,149
Commercial Real Estate - Owner Occupied [Member] | Total Commercial [Member] | Substandard [Member] | Total Commercial And Industrial [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 64,887 | 76,117
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 2,563,394 | 2,341,779
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] | Pass [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 2,450,517 | 2,265,087
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] | Pass-Watch [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 81,718 | 46,535
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] | Special Mention [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 10,760 | 5,510
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] | Substandard [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 20,399 | 24,647
Construction and Land Development [Member] | Total Commercial [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 1,340,067 | 1,548,335
Construction and Land Development [Member] | Total Commercial [Member] | Pass [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 1,319,519 | 1,487,599
Construction and Land Development [Member] | Total Commercial [Member] | Pass-Watch [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 9,743 | 49,099
Construction and Land Development [Member] | Total Commercial [Member] | Special Mention [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 890 | 816
Construction and Land Development [Member] | Total Commercial [Member] | Substandard [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | $ 9,915 | $ 10,821

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