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Loans and Allowance for Credit Losses (Credit Quality Indicators by Segments and Portfolio Class) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Total Commercial [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | $ 17,267,424 | $ 16,057,306
Total Commercial [Member] | Total Commercial And Industrial [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 12,844,428 | 11,905,407
Total Commercial [Member] | Pass [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 16,332,902 | 15,014,111
Total Commercial [Member] | Pass [Member] | Total Commercial And Industrial [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 12,080,687 | 11,009,561
Total Commercial [Member] | Pass-Watch [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 541,885 | 462,502
Total Commercial [Member] | Pass-Watch [Member] | Total Commercial And Industrial [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 429,097 | 367,116
Total Commercial [Member] | Special Mention [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 137,592 | 101,583
Total Commercial [Member] | Special Mention [Member] | Total Commercial And Industrial [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 125,852 | 86,305
Total Commercial [Member] | Substandard [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 255,045 | 479,110
Total Commercial [Member] | Substandard [Member] | Total Commercial And Industrial [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 208,792 | 442,425
Residential Portfolio Segment |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 2,665,212 | 2,990,631
Residential Portfolio Segment | Performing [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 2,622,422 | 2,950,854
Residential Portfolio Segment | Nonperforming [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 42,790 | 39,777
Consumer Portfolio Segment |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 1,857,295 | 2,164,818
Consumer Portfolio Segment | Performing [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 1,832,885 | 2,147,312
Consumer Portfolio Segment | Nonperforming [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 24,410 | 17,506
Residential Mortgage and Consumer [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 4,522,507 | 5,155,449
Residential Mortgage and Consumer [Member] | Performing [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 4,455,307 | 5,098,166
Residential Mortgage and Consumer [Member] | Nonperforming [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 67,200 | 57,283
Commercial Non-Real Estate [Member] | Total Commercial [Member] | Total Commercial And Industrial [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 9,986,983 | 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 | 9,439,264 | 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 | 314,739 | 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 | 79,613 | 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 | 153,367 | 382,330
Commercial Real Estate Owner Occupied | Total Commercial [Member] | Total Commercial And Industrial [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 2,857,445 | 2,738,460
Commercial Real Estate Owner Occupied | Total Commercial [Member] | Pass [Member] | Total Commercial And Industrial [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 2,641,423 | 2,517,448
Commercial Real Estate Owner Occupied | Total Commercial [Member] | Pass-Watch [Member] | Total Commercial And Industrial [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 114,358 | 146,266
Commercial Real Estate Owner Occupied | Total Commercial [Member] | Special Mention [Member] | Total Commercial And Industrial [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 46,239 | 14,651
Commercial Real Estate Owner Occupied | Total Commercial [Member] | Substandard [Member] | Total Commercial And Industrial [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 55,425 | 60,095
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 3,357,939 | 2,994,448
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] | Pass [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 3,219,155 | 2,883,553
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] | Pass-Watch [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 89,968 | 69,765
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] | Special Mention [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 5,989 | 14,995
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] | Substandard [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 42,827 | 26,135
Construction and Land Development [Member] | Total Commercial [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 1,065,057 | 1,157,451
Construction and Land Development [Member] | Total Commercial [Member] | Pass [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 1,033,060 | 1,120,997
Construction and Land Development [Member] | Total Commercial [Member] | Pass-Watch [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 22,820 | 25,621
Construction and Land Development [Member] | Total Commercial [Member] | Special Mention [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | 5,751 | 283
Construction and Land Development [Member] | Total Commercial [Member] | Substandard [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | $ 3,426 | $ 10,550

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