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Derivatives (Narrative) (Details) - USD ($) | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Jan. 31, 2015 | Dec. 31, 2014
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |
Collateral cash receivables | $ 88,600,000 | $ 89,800,000 | $ 88,600,000 | $ 89,800,000 |  |
Collateral cash payables | 47,400,000 | 68,100,000 | 47,400,000 | 68,100,000 |  |
Total trading revenues | 43,000,000 | 41,200,000 | $ 143,200,000 | 131,300,000 |  |
Noncallable senior debt maturing date |  |  | Dec. 01, 2015 |  |  |
Other Long-term Debt | 1,341,186,000 | 1,491,138,000 | $ 1,341,186,000 | 1,491,138,000 |  | $ 1,880,105,000
Hedged amount of foreign currency denominated loans | 2,800,000 |  | 2,800,000 |  |  |
Borrowings matured |  |  |  |  | $ 304,000,000 |
Gains/(loss) on extinguishment of debt | 5,794,000 | 0 | 5,794,000 | (4,350,000) |  |
Visa Class B Shares [Member] |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |
Derivative liabilities related to sale | 4,800,000 | 7,600,000 | $ 4,800,000 | 7,600,000 |  |
First Tennessee Bank National Association [Member] |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |
Noncallable senior debt maturing date |  |  | Dec. 01, 2019 |  |  |
Long Term Debt Hedged With Fair Value Interest Rate Derivatives Using Shortcut Method [Member] |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |
Net fair value of interest rate derivatives hedging | 6,100,000 | 21,400,000 | $ 6,100,000 | 21,400,000 |  |
Other Long-term Debt | 250,000,000 | 554,000,000 | 250,000,000 | 554,000,000 |  |
Long Term Debt Hedged With Fair Value Interest Rate Derivatives Using Long Haul Method [Member] |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |
Net fair value of interest rate derivatives hedging | 2,100,000 | 11,300,000 | 2,100,000 | 11,300,000 |  |
Other Long-term Debt | 500,000,000 | 500,000,000 | 500,000,000 | 500,000,000 |  |
Long Term Debt Hedged With Fair Value Interest Rate Derivatives Using Long Haul Method [Member] | First Tennessee Bank National Association [Member] |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |
Net fair value of interest rate derivatives hedging | 8,800,000 |  | 8,800,000 |  |  |
Other Long-term Debt | 400,000,000 |  | 400,000,000 |  |  |
Subordinated Debentures Subject To Mandatory Redemption Amounts Redeemed [Member] |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |
Net fair value of interest rate derivatives hedging subordinated debt |  | 9,800,000 |  | 9,800,000 |  |
Other Long-term Debt |  | 200,000,000 |  | 200,000,000 |  |
Additional Derivative Agreements [Member] | Derivative Instruments With Accelerated Termination Provisions [Member] |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |
Collateral received | 156,900,000 | 191,500,000 | 156,900,000 | 191,500,000 |  |
Securities posted collateral | 24,600,000 | 26,300,000 | 24,600,000 | 26,300,000 |  |
Net fair value of derivative assets with adjustable posting thresholds | 93,100,000 | 104,700,000 | 93,100,000 | 104,700,000 |  |
Net fair value of derivative liabilities with adjustable posting thresholds | 20,200,000 | 19,100,000 | 20,200,000 | 19,100,000 |  |
Additional Derivative Agreements [Member] | Derivative Instruments With Adjustable Collateral Posting Thresholds [Member] |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |
Collateral received | 156,900,000 | 191,500,000 | 156,900,000 | 191,500,000 |  |
Securities posted collateral | 79,900,000 | 80,600,000 | 79,900,000 | 80,600,000 |  |
Net fair value of derivative assets with adjustable posting thresholds | 93,100,000 | 104,700,000 | 93,100,000 | 104,700,000 |  |
Net fair value of derivative liabilities with adjustable posting thresholds | $ 79,700,000 | $ 77,600,000 | $ 79,700,000 | $ 77,600,000 |  |

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