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Loans and Allowance for Loan Losses (Credit Quality Indicators by Segments and Portfolio Class) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Total Commercial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | $ 14,198,396 | $ 12,545,507
Total Commercial [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 12,601,853 | 10,925,611
Total Commercial [Member] | Pass-Watch [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 520,230 | 351,888
Total Commercial [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 126,137 | 248,696
Total Commercial [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 950,111 | 1,001,599
Total Commercial [Member] | Doubtful [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 65 | 17,713
Residential Mortgages [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 2,690,472 | 2,146,713
Consumer [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 2,115,295 | 2,059,931
Residential Mortgage and Consumer [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 4,805,767 | 4,206,644
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 2,384,599 | 2,013,890
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 2,223,245 | 1,873,644
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] | Pass-Watch [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 83,444 | 78,309
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 13,244 | 22,492
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 64,658 | 39,434
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] | Doubtful [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 8 | 11
Construction and Land Development [Member] | Total Commercial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 1,373,421 | 1,010,879
Construction and Land Development [Member] | Total Commercial [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 1,291,638 | 968,505
Construction and Land Development [Member] | Total Commercial [Member] | Pass-Watch [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 60,804 | 22,592
Construction and Land Development [Member] | Total Commercial [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 4,788 | 4,142
Construction and Land Development [Member] | Total Commercial [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 16,191 | 15,640
Total Commercial And Industrial [Member] | Total Commercial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 10,440,376 | 9,520,738
Total Commercial And Industrial [Member] | Total Commercial [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 9,086,970 | 8,083,462
Total Commercial And Industrial [Member] | Total Commercial [Member] | Pass-Watch [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 375,982 | 250,987
Total Commercial And Industrial [Member] | Total Commercial [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 108,105 | 222,062
Total Commercial And Industrial [Member] | Total Commercial [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 869,262 | 946,525
Total Commercial And Industrial [Member] | Total Commercial [Member] | Doubtful [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 57 | 17,702
Total Commercial And Industrial [Member] | Commercial Non-Real Estate [Member] | Total Commercial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 8,297,937 | 7,613,917
Total Commercial And Industrial [Member] | Commercial Non-Real Estate [Member] | Total Commercial [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 7,190,604 | 6,364,348
Total Commercial And Industrial [Member] | Commercial Non-Real Estate [Member] | Total Commercial [Member] | Pass-Watch [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 293,069 | 203,311
Total Commercial And Industrial [Member] | Commercial Non-Real Estate [Member] | Total Commercial [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 80,649 | 181,763
Total Commercial And Industrial [Member] | Commercial Non-Real Estate [Member] | Total Commercial [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 733,558 | 846,793
Total Commercial And Industrial [Member] | Commercial Non-Real Estate [Member] | Total Commercial [Member] | Doubtful [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 57 | 17,702
Total Commercial And Industrial [Member] | Commercial Real Estate - Owner Occupied [Member] | Total Commercial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 2,142,439 | 1,906,821
Total Commercial And Industrial [Member] | Commercial Real Estate - Owner Occupied [Member] | Total Commercial [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 1,896,366 | 1,719,114
Total Commercial And Industrial [Member] | Commercial Real Estate - Owner Occupied [Member] | Total Commercial [Member] | Pass-Watch [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 82,913 | 47,676
Total Commercial And Industrial [Member] | Commercial Real Estate - Owner Occupied [Member] | Total Commercial [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 27,456 | 40,299
Total Commercial And Industrial [Member] | Commercial Real Estate - Owner Occupied [Member] | Total Commercial [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 135,704 | 99,732
Performing [Member] | Residential Mortgages [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 2,647,784 | 2,123,048
Performing [Member] | Consumer [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 2,099,637 | 2,046,757
Performing [Member] | Residential Mortgage and Consumer [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 4,747,421 | 4,169,805
Nonperforming [Member] | Residential Mortgages [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 42,688 | 23,665
Nonperforming [Member] | Consumer [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 15,658 | 13,174
Nonperforming [Member] | Residential Mortgage and Consumer [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | $ 58,346 | $ 36,839

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