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Loans and Allowance for Credit Losses (Credit Quality Indicators by Segments and Portfolio Class) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Total Commercial [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | $ 16,057,306 | $ 14,968,463
Total Commercial [Member] | Total Commercial And Industrial [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 11,905,407 | 11,078,349
Total Commercial [Member] | Pass [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 15,014,111 | 13,902,485
Total Commercial [Member] | Pass [Member] | Total Commercial And Industrial [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 11,009,561 | 10,149,799
Total Commercial [Member] | Pass-Watch [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 462,502 | 440,415
Total Commercial [Member] | Pass-Watch [Member] | Total Commercial And Industrial [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 367,116 | 344,781
Total Commercial [Member] | Special Mention [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 101,583 | 105,227
Total Commercial [Member] | Special Mention [Member] | Total Commercial And Industrial [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 86,305 | 98,901
Total Commercial [Member] | Substandard [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 479,110 | 520,336
Total Commercial [Member] | Substandard [Member] | Total Commercial And Industrial [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 442,425 | 484,868
Residential Mortgages [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 2,990,631 | 2,910,081
Residential Mortgages [Member] | Performing [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 2,950,854 | 2,873,669
Residential Mortgages [Member] | Nonperforming [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 39,777 | 36,412
Consumer [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 2,164,818 | 2,147,867
Consumer [Member] | Performing [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 2,147,312 | 2,130,395
Consumer [Member] | Nonperforming [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 17,506 | 17,472
Residential Mortgage and Consumer [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 5,155,449 | 5,057,948
Residential Mortgage and Consumer [Member] | Performing [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 5,098,166 | 5,004,064
Residential Mortgage and Consumer [Member] | Nonperforming [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 57,283 | 53,884
Commercial Non-Real Estate [Member] | Total Commercial [Member] | Total Commercial And Industrial [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 9,166,947 | 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 | 8,492,113 | 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 | 220,850 | 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 | 71,654 | 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 | 382,330 | 408,751
Commercial Real Estate - Owner Occupied [Member] | Total Commercial [Member] | Total Commercial And Industrial [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 2,738,460 | 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 | 2,517,448 | 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 | 146,266 | 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 | 14,651 | 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 | 60,095 | 76,117
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 2,994,448 | 2,341,779
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] | Pass [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 2,883,553 | 2,265,087
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] | Pass-Watch [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 69,765 | 46,535
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] | Special Mention [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 14,995 | 5,510
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] | Substandard [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 26,135 | 24,647
Construction and Land Development [Member] | Total Commercial [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 1,157,451 | 1,548,335
Construction and Land Development [Member] | Total Commercial [Member] | Pass [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 1,120,997 | 1,487,599
Construction and Land Development [Member] | Total Commercial [Member] | Pass-Watch [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 25,621 | 49,099
Construction and Land Development [Member] | Total Commercial [Member] | Special Mention [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 283 | 816
Construction and Land Development [Member] | Total Commercial [Member] | Substandard [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | $ 10,550 | $ 10,821

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