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Loans and Allowance for Credit Losses (Credit Quality Indicators by Segments and Portfolio Class) (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Total Commercial [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | $ 16,384,169 | $ 16,057,306
Total Commercial [Member] | Total Commercial And Industrial [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 12,052,660 | 11,905,407
Total Commercial [Member] | Pass [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 15,109,069 | 15,014,111
Total Commercial [Member] | Pass [Member] | Total Commercial And Industrial [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 10,924,494 | 11,009,561
Total Commercial [Member] | Pass-Watch [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 744,969 | 462,502
Total Commercial [Member] | Pass-Watch [Member] | Total Commercial And Industrial [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 644,263 | 367,116
Total Commercial [Member] | Special Mention [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 85,374 | 101,583
Total Commercial [Member] | Special Mention [Member] | Total Commercial And Industrial [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 73,074 | 86,305
Total Commercial [Member] | Substandard [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 429,808 | 479,110
Total Commercial [Member] | Substandard [Member] | Total Commercial And Industrial [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 395,880 | 442,425
Total Commercial [Member] | Doubtful [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 14,949 |
Total Commercial [Member] | Doubtful [Member] | Total Commercial And Industrial [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 14,949 |
Residential Mortgages [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 2,979,985 | 2,990,631
Residential Mortgages [Member] | Performing [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 2,936,218 | 2,950,854
Residential Mortgages [Member] | Nonperforming [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 43,767 | 39,777
Consumer [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 2,151,527 | 2,164,818
Consumer [Member] | Performing [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 2,132,482 | 2,147,312
Consumer [Member] | Nonperforming [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 19,045 | 17,506
Residential Mortgage and Consumer [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 5,131,512 | 5,155,449
Residential Mortgage and Consumer [Member] | Performing [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 5,068,700 | 5,098,166
Residential Mortgage and Consumer [Member] | Nonperforming [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 62,812 | 57,283
Commercial Non-Real Estate [Member] | Total Commercial [Member] | Total Commercial And Industrial [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 9,321,340 | 9,166,947
Commercial Non-Real Estate [Member] | Total Commercial [Member] | Pass [Member] | Total Commercial And Industrial [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 8,391,474 | 8,492,113
Commercial Non-Real Estate [Member] | Total Commercial [Member] | Pass-Watch [Member] | Total Commercial And Industrial [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 507,455 | 220,850
Commercial Non-Real Estate [Member] | Total Commercial [Member] | Special Mention [Member] | Total Commercial And Industrial [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 61,397 | 71,654
Commercial Non-Real Estate [Member] | Total Commercial [Member] | Substandard [Member] | Total Commercial And Industrial [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 346,065 | 382,330
Commercial Non-Real Estate [Member] | Total Commercial [Member] | Doubtful [Member] | Total Commercial And Industrial [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 14,949 |
Commercial Real Estate - Owner Occupied [Member] | Total Commercial [Member] | Total Commercial And Industrial [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 2,731,320 | 2,738,460
Commercial Real Estate - Owner Occupied [Member] | Total Commercial [Member] | Pass [Member] | Total Commercial And Industrial [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 2,533,020 | 2,517,448
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 | 136,808 | 146,266
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 | 11,677 | 14,651
Commercial Real Estate - Owner Occupied [Member] | Total Commercial [Member] | Substandard [Member] | Total Commercial And Industrial [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 49,815 | 60,095
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 3,232,783 | 2,994,448
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] | Pass [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 3,119,828 | 2,883,553
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] | Pass-Watch [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 75,823 | 69,765
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] | Special Mention [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 11,330 | 14,995
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] | Substandard [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 25,802 | 26,135
Construction and Land Development [Member] | Total Commercial [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 1,098,726 | 1,157,451
Construction and Land Development [Member] | Total Commercial [Member] | Pass [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 1,064,747 | 1,120,997
Construction and Land Development [Member] | Total Commercial [Member] | Pass-Watch [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 24,883 | 25,621
Construction and Land Development [Member] | Total Commercial [Member] | Special Mention [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 970 | 283
Construction and Land Development [Member] | Total Commercial [Member] | Substandard [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | $ 8,126 | $ 10,550

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