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Loans and Allowance for Loan Losses (Age Analysis of Past Due Loans by Portfolio Class) (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016 | Jun. 30, 2016
--- | --- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total past due | $ 268,267 | $ 195,107 |
Current | 18,205,574 | 16,557,044 |
Total loans | 18,473,841 | 16,752,151 | $ 16,035,796
Recorded investment > 90 days and accruing | 18,390 | 3,039 |
30-59 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total past due | 83,099 | 67,482 |
60-89 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total past due | 50,152 | 18,968 |
Greater Than 90 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total past due | 135,016 | 108,657 |
Total Commercial [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total loans | 13,886,631 | 12,545,507 |
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total past due | 10,728 | 5,914 |
Current | 2,390,945 | 2,007,976 |
Total loans | 2,401,673 | 2,013,890 | 2,024,471
Recorded investment > 90 days and accruing | 1,989 | 216 |
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 | 3,369 | 838 |
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 | 2,319 | 50 |
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 | 5,040 | 5,026 |
Total Commercial [Member] | Construction and Land Development [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total past due | 8,849 | 6,165 |
Current | 1,304,673 | 1,004,714 |
Total loans | 1,313,522 | 1,010,879 | 880,588
Recorded investment > 90 days and accruing |  | 1,563 |
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 | 6,250 | 694 |
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 | 619 | 171 |
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 | 1,980 | 5,300 |
Total Commercial [Member] | Total Commercial & Industrial [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total past due | 159,754 | 100,035 |
Current | 10,011,682 | 9,420,703 |
Total loans | 10,171,436 | 9,520,738 | 9,048,719
Recorded investment > 90 days and accruing | 13,512 | 436 |
Total Commercial [Member] | Total Commercial & Industrial [Member] | 30-59 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total past due | 32,283 | 22,730 |
Total Commercial [Member] | Total Commercial & Industrial [Member] | 60-89 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total past due | 29,163 | 2,490 |
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 | 98,308 | 74,815 |
Total Commercial [Member] | Total Commercial & Industrial [Member] | Commercial Non-Real Estate [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total past due | 147,712 | 90,136 |
Current | 7,945,392 | 7,523,781 |
Total loans | 8,093,104 | 7,613,917 | 7,132,519
Recorded investment > 90 days and accruing | 13,088 | 384 |
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 | 27,751 | 19,722 |
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 | 27,974 | 1,909 |
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 | 91,987 | 68,505 |
Total Commercial [Member] | Total Commercial & Industrial [Member] | Commercial Real Estate - Owner Occupied [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total past due | 12,042 | 9,899 |
Current | 2,066,290 | 1,896,922 |
Total loans | 2,078,332 | 1,906,821 | 1,916,200
Recorded investment > 90 days and accruing | 424 | 52 |
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 | 4,532 | 3,008 |
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 | 1,189 | 581 |
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 | 6,321 | 6,310 |
Residential Mortgages [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total past due | 59,729 | 47,784 |
Current | 2,434,194 | 2,098,929 |
Total loans | 2,493,923 | 2,146,713 | 2,017,650
Recorded investment > 90 days and accruing | 2,801 | 1 |
Residential Mortgages [Member] | 30-59 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total past due | 25,433 | 24,599 |
Residential Mortgages [Member] | 60-89 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total past due | 12,208 | 8,816 |
Residential Mortgages [Member] | Greater Than 90 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total past due | 22,088 | 14,369 |
Consumer [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total past due | 29,207 | 35,209 |
Current | 2,064,080 | 2,024,722 |
Total loans | 2,093,287 | 2,059,931 | $ 2,064,368
Recorded investment > 90 days and accruing | 88 | 823 |
Consumer [Member] | 30-59 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total past due | 15,764 | 18,621 |
Consumer [Member] | 60-89 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total past due | 5,843 | 7,441 |
Consumer [Member] | Greater Than 90 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total past due | $ 7,600 | $ 9,147 |

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