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Loans and Allowance for Loan Losses (Loans, Net of Unearned Income) (Details) - USD ($) $ in Thousands | Jun. 30, 2016 | Dec. 31, 2015 | Jun. 30, 2015
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans | $ 16,035,796 | $ 15,703,314 | $ 14,344,752
Total Commercial [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans | 11,953,778 | 11,560,325 |
Residential Mortgages [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans | 2,017,650 | 2,049,524 | 1,955,837
Consumer [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans | 2,064,368 | 2,093,465 | 1,869,451
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans | 2,024,471 | 1,553,082 | 1,452,091
Construction and Land Development [Member] | Total Commercial [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans | 880,588 | 1,151,950 | 1,120,947
Total Commercial & Industrial [Member] | Total Commercial [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans | 9,048,719 | 8,855,293 | 7,946,426
Total Commercial & Industrial [Member] | Commercial Non-Real Estate [Member] | Total Commercial [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans | 7,132,519 | 6,995,824 | 6,185,684
Total Commercial & Industrial [Member] | Commercial Real Estate - Owner Occupied [Member] | Total Commercial [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans | $ 1,916,200 | $ 1,859,469 | $ 1,760,742

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- Definition Amount before allowance and deduction of deferred interest and fees, unamortized costs and premiums over and discounts from face amounts, of loans and leases held in portfolio, including loans and leases covered under loss sharing agreements. + References No definition available. + Details
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