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Derivatives (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Dec. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Collateral cash receivables | $ 41,900 |  | $ 47,800
Collateral cash payables | 29,400 |  | 32,800
Total trading revenues | 42,700 | $ 57,600 |
Other Long-term Debt | 1,035,036 |  | 1,040,656
Hedged amount of foreign currency denominated loans | $ 1,900 |  | 3,800
Cash flow hedge length of time |  | 5 years |
Maximum [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Cash flow hedge length of time | 7 years |  |
Minimum [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Cash flow hedge length of time | 3 years |  |
Cash Flow Hedge | Hedged Items [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Variability in Cash Flows Related to Debt Instruments (Primarily Loans) | $ 650,000 | $ 250,000 |
Visa Class B Shares [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivative liabilities related to sale | 6,000 |  | 6,200
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 | 500 |  |
Net fair value of interest rate derivatives hedging subordinated debt |  |  | 7,300
Other Long-term Debt | 500,000 |  | 500,000
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 | 300 |  | 1,600
Other Long-term Debt | 400,000 |  | 400,000
Additional Derivative Agreements [Member] | Derivative Instruments With Accelerated Termination Provisions [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Collateral received | 120,600 |  | 137,500
Securities posted collateral | 10,000 |  | 12,900
Net fair value of derivative assets with adjustable posting thresholds | 30,700 |  | 35,900
Net fair value of derivative liabilities with adjustable posting thresholds | 19,200 |  | 19,600
Additional Derivative Agreements [Member] | Derivative Instruments With Adjustable Collateral Posting Thresholds [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Collateral received | 121,200 |  | 137,600
Securities posted collateral | 33,000 |  | 39,300
Net fair value of derivative assets with adjustable posting thresholds | 31,300 |  | 35,900
Net fair value of derivative liabilities with adjustable posting thresholds | 44,100 |  | 49,000
Interest Rate Contract [Member] | Cash Flow Hedge | Hedged Items [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Variability in Cash Flows Related to Debt Instruments (Primarily Loans) | $ 900,000 |  | $ 250,000

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