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Loans and Allowance for Loan Losses (Credit Quality Indicators by Segments and Portfolio Class) (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Total Commercial [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | $ 15,118,618 | $ 14,968,463
Total Commercial [Member] | Total Commercial And Industrial [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 11,079,088 | 11,078,349
Total Commercial [Member] | Pass [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 14,139,822 | 13,902,485
Total Commercial [Member] | Pass [Member] | Total Commercial And Industrial [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 10,261,685 | 10,149,799
Total Commercial [Member] | Pass-Watch [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 405,943 | 440,415
Total Commercial [Member] | Pass-Watch [Member] | Total Commercial And Industrial [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 291,055 | 344,781
Total Commercial [Member] | Special Mention [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 95,706 | 105,227
Total Commercial [Member] | Special Mention [Member] | Total Commercial And Industrial [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 74,526 | 98,901
Total Commercial [Member] | Substandard [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 477,147 | 520,336
Total Commercial [Member] | Substandard [Member] | Total Commercial And Industrial [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 451,822 | 484,868
Residential Mortgages [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 2,968,271 | 2,910,081
Residential Mortgages [Member] | Performing [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 2,930,531 | 2,873,669
Residential Mortgages [Member] | Nonperforming [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 37,740 | 36,412
Consumer [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 2,088,923 | 2,147,867
Consumer [Member] | Performing [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 2,070,863 | 2,130,395
Consumer [Member] | Nonperforming [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 18,060 | 17,472
Residential Mortgage and Consumer [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 5,057,194 | 5,057,948
Residential Mortgage and Consumer [Member] | Performing [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 5,001,394 | 5,004,064
Residential Mortgage and Consumer [Member] | Nonperforming [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 55,800 | 53,884
Commercial Non-Real Estate [Member] | Total Commercial [Member] | Total Commercial And Industrial [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 8,559,118 | 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 | 7,940,853 | 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 | 169,005 | 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 | 62,545 | 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 | 386,715 | 408,751
Commercial Real Estate - Owner Occupied [Member] | Total Commercial [Member] | Total Commercial And Industrial [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 2,519,970 | 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 | 2,320,832 | 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 | 122,050 | 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 | 11,981 | 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 | 65,107 | 76,117
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 2,895,468 | 2,341,779
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] | Pass [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 2,755,518 | 2,265,087
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] | Pass-Watch [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 98,767 | 46,535
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] | Special Mention [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 20,927 | 5,510
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] | Substandard [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 20,256 | 24,647
Construction and Land Development [Member] | Total Commercial [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 1,144,062 | 1,548,335
Construction and Land Development [Member] | Total Commercial [Member] | Pass [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 1,122,619 | 1,487,599
Construction and Land Development [Member] | Total Commercial [Member] | Pass-Watch [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 16,121 | 49,099
Construction and Land Development [Member] | Total Commercial [Member] | Special Mention [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 253 | 816
Construction and Land Development [Member] | Total Commercial [Member] | Substandard [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | $ 5,069 | $ 10,821

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