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Derivatives (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 | Mar. 31, 2017 | Sep. 30, 2016 | Mar. 31, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Derivative Liabilities not subject to master netting agreements | $ 13,200 |  |  |  | $ 13,200 |  | $ 39,500
Derivative Assets not subject to master netting agreements | 10,100 |  |  |  | 10,100 |  | 33,700
Collateral cash receivables | 34,500 |  |  |  | 34,500 |  | 47,800
Collateral cash payables | 28,200 |  |  |  | 28,200 |  | 32,800
Total trading revenues | 45,000 |  | $ 59,000 |  | 133,300 | $ 185,900 |
Other Long-term Debt | 1,059,507 |  |  |  | 1,059,507 |  | 1,040,656
Hedged amount of foreign currency denominated loans | 1,300 |  |  |  | 1,300 |  | 3,800
Cash flow hedge length of time |  |  |  | 5 years |  |  |
Cash Flow Hedge | Hedged Items |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Variability in Cash Flows Related to Debt Instruments (Primarily Loans) |  | $ 650,000 |  | $ 250,000 |  |  |
Visa Class B Shares |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Derivative liabilities related to sale | 5,500 |  |  |  | 5,500 |  | 6,200
Long Term Debt Hedged With Fair Value Interest Rate Derivatives Using Long Haul Method |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Net fair value of interest rate derivatives hedging subordinated debt | 600 |  |  |  | 600 |  | 7,300
Other Long-term Debt | 500,000 |  |  |  | 500,000 |  | 500,000
Long Term Debt Hedged With Fair Value Interest Rate Derivatives Using Long Haul Method | First Tennessee Bank National Association |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Net fair value of interest rate derivatives hedging |  |  |  |  |  |  | 1,600
Net fair value of interest rate derivatives hedging subordinated debt | 200 |  |  |  | 200 |  |
Other Long-term Debt | 400,000 |  |  |  | 400,000 |  | 400,000
Additional Derivative Agreements | Derivative Instruments With Accelerated Termination Provisions |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Collateral received | 113,600 |  |  |  | 113,600 |  | 137,500
Securities posted collateral | 9,000 |  |  |  | 9,000 |  | 12,900
Net fair value of derivative assets with adjustable posting thresholds | 27,400 |  |  |  | 27,400 |  | 35,900
Net fair value of derivative liabilities with adjustable posting thresholds | 14,900 |  |  |  | 14,900 |  | 19,600
Additional Derivative Agreements | Derivative Instruments With Adjustable Collateral Posting Thresholds |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Collateral received | 113,600 |  |  |  | 113,600 |  | 137,600
Securities posted collateral | 26,200 |  |  |  | 26,200 |  | 39,300
Net fair value of derivative assets with adjustable posting thresholds | 27,400 |  |  |  | 27,400 |  | 35,900
Net fair value of derivative liabilities with adjustable posting thresholds | 34,600 |  |  |  | 34,600 |  | 49,000
Interest Rate Contract | Cash Flow Hedge | Hedged Items |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Variability in Cash Flows Related to Debt Instruments (Primarily Loans) | $ 900,000 |  |  |  | $ 900,000 |  | $ 250,000
Minimum |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Cash flow hedge length of time |  | 3 years |  |  |  |  |
Maximum |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Cash flow hedge length of time |  | 7 years |  |  |  |  |

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