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Loans (Age Analysis of Past Due Loans by Portfolio Class) (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total past due | $ 195,107 | $ 153,691
Current | 16,557,044 | 15,549,623
Total loans | 16,752,151 | 15,703,314
Recorded investment > 90 days and accruing | 3,039 | 7,653
30-59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total past due | 67,482 | 79,027
60-89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total past due | 18,968 | 12,101
Greater Than 90 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total past due | 108,657 | 62,563
Total Commercial [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans | 12,545,507 | 11,560,325
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total past due | 5,914 | 7,856
Current | 2,007,976 | 1,545,226
Total loans | 2,013,890 | 1,553,082
Recorded investment > 90 days and accruing | 216 | 499
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member] | 30-59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total past due | 838 | 871
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member] | 60-89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total past due | 50 | 603
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member] | Greater Than 90 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total past due | 5,026 | 6,382
Total Commercial [Member] | Construction and Land Development [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total past due | 6,165 | 24,365
Current | 1,004,714 | 1,127,585
Total loans | 1,010,879 | 1,151,950
Recorded investment > 90 days and accruing | 1,563 | 1,230
Total Commercial [Member] | Construction and Land Development [Member] | 30-59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total past due | 694 | 19,886
Total Commercial [Member] | Construction and Land Development [Member] | 60-89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total past due | 171 | 436
Total Commercial [Member] | Construction and Land Development [Member] | Greater Than 90 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total past due | 5,300 | 4,043
Total Commercial [Member] | Total Commercial & Industrial [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total past due | 100,035 | 57,227
Current | 9,420,703 | 8,798,066
Total loans | 9,520,738 | 8,855,293
Recorded investment > 90 days and accruing | 436 | 3,595
Total Commercial [Member] | Total Commercial & Industrial [Member] | 30-59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total past due | 22,730 | 23,304
Total Commercial [Member] | Total Commercial & Industrial [Member] | 60-89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total past due | 2,490 | 2,270
Total Commercial [Member] | Total Commercial & Industrial [Member] | Greater Than 90 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total past due | 74,815 | 31,653
Total Commercial [Member] | Total Commercial & Industrial [Member] | Commercial Non-Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total past due | 90,136 | 43,881
Current | 7,523,781 | 6,951,943
Total loans | 7,613,917 | 6,995,824
Recorded investment > 90 days and accruing | 384 | 3,060
Total Commercial [Member] | Total Commercial & Industrial [Member] | Commercial Non-Real Estate [Member] | 30-59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total past due | 19,722 | 17,406
Total Commercial [Member] | Total Commercial & Industrial [Member] | Commercial Non-Real Estate [Member] | 60-89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total past due | 1,909 | 1,468
Total Commercial [Member] | Total Commercial & Industrial [Member] | Commercial Non-Real Estate [Member] | Greater Than 90 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total past due | 68,505 | 25,007
Total Commercial [Member] | Total Commercial & Industrial [Member] | Commercial Real Estate - Owner Occupied [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total past due | 9,899 | 13,346
Current | 1,896,922 | 1,846,123
Total loans | 1,906,821 | 1,859,469
Recorded investment > 90 days and accruing | 52 | 535
Total Commercial [Member] | Total Commercial & Industrial [Member] | Commercial Real Estate - Owner Occupied [Member] | 30-59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total past due | 3,008 | 5,898
Total Commercial [Member] | Total Commercial & Industrial [Member] | Commercial Real Estate - Owner Occupied [Member] | 60-89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total past due | 581 | 802
Total Commercial [Member] | Total Commercial & Industrial [Member] | Commercial Real Estate - Owner Occupied [Member] | Greater Than 90 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total past due | 6,310 | 6,646
Residential Mortgages [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total past due | 47,784 | 34,857
Current | 2,098,929 | 2,014,667
Total loans | 2,146,713 | 2,049,524
Recorded investment > 90 days and accruing | 1 | 163
Residential Mortgages [Member] | 30-59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total past due | 24,599 | 18,657
Residential Mortgages [Member] | 60-89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total past due | 8,816 | 4,360
Residential Mortgages [Member] | Greater Than 90 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total past due | 14,369 | 11,840
Consumer [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total past due | 35,209 | 29,386
Current | 2,024,722 | 2,064,079
Total loans | 2,059,931 | 2,093,465
Recorded investment > 90 days and accruing | 823 | 2,166
Consumer [Member] | 30-59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total past due | 18,621 | 16,309
Consumer [Member] | 60-89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total past due | 7,441 | 4,432
Consumer [Member] | Greater Than 90 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total past due | $ 9,147 | $ 8,645

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