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Loans and Allowance for Loan Losses (Age Analysis of Past Due Loans by Portfolio Class) (Details) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015 | Sep. 30, 2015
--- | --- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total past due | $ 201,790 | $ 153,691 |
Current | 15,869,031 | 15,549,623 |
Total loans | 16,070,821 | 15,703,314 | $ 14,763,050
Recorded investment > 90 days and still accruing | 4,933 | 7,653 |
30-59 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total past due | 60,166 | 79,027 |
60-89 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total past due | 39,644 | 12,101 |
Greater Than 90 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total past due | 101,980 | 62,563 |
Total Commercial [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total loans | 11,972,654 | 11,560,325 |
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total past due | 6,519 | 7,856 |
Current | 1,983,790 | 1,545,226 |
Total loans | 1,990,309 | 1,553,082 | 1,484,232
Recorded investment > 90 days and still accruing |  | 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 | 1,873 | 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 | 225 | 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 | 4,421 | 6,382 |
Total Commercial [Member] | Construction and Land Development [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total past due | 9,992 | 24,365 |
Current | 936,600 | 1,127,585 |
Total loans | 946,592 | 1,151,950 | 1,085,585
Recorded investment > 90 days and still accruing | 3,501 | 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 | 1,069 | 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 | 1,565 | 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 | 7,358 | 4,043 |
Total Commercial [Member] | Total Commercial & Industrial [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total past due | 115,239 | 57,227 |
Current | 8,920,514 | 8,798,066 |
Total loans | 9,035,753 | 8,855,293 | 8,189,148
Recorded investment > 90 days and still accruing | 543 | 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 | 18,507 | 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 | 25,681 | 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 | 71,051 | 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 | 103,861 | 43,881 |
Current | 7,030,067 | 6,951,943 |
Total loans | 7,133,928 | 6,995,824 | 6,345,994
Recorded investment > 90 days and still accruing | 543 | 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 | 15,501 | 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 | 24,566 | 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 | 63,794 | 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 | 11,378 | 13,346 |
Current | 1,890,447 | 1,846,123 |
Total loans | 1,901,825 | 1,859,469 | 1,843,154
Recorded investment > 90 days and still accruing |  | 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 | 3,006 | 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 | 1,115 | 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 | 7,257 | 6,646 |
Residential Mortgages [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total past due | 41,379 | 34,857 |
Current | 1,995,783 | 2,014,667 |
Total loans | 2,037,162 | 2,049,524 | 2,013,789
Recorded investment > 90 days and still accruing |  | 163 |
Residential Mortgages [Member] | 30-59 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total past due | 23,067 | 18,657 |
Residential Mortgages [Member] | 60-89 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total past due | 6,771 | 4,360 |
Residential Mortgages [Member] | Greater Than 90 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total past due | 11,541 | 11,840 |
Consumer [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total past due | 28,661 | 29,386 |
Current | 2,032,344 | 2,064,079 |
Total loans | 2,061,005 | 2,093,465 | $ 1,990,296
Recorded investment > 90 days and still accruing | 889 | 2,166 |
Consumer [Member] | 30-59 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total past due | 15,650 | 16,309 |
Consumer [Member] | 60-89 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total past due | 5,402 | 4,432 |
Consumer [Member] | Greater Than 90 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total past due | $ 7,609 | $ 8,645 |

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