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Derivatives (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Collateral cash receivables |  |  | $ 27,800 | $ 47,800
Collateral cash payables |  |  | 28,300 | 32,800
Total trading revenues |  |  | 173,900 | 229,700
Other long term borrowings |  |  | 1,218,097 | 1,040,656
Derivative liabilities not subject to master netting agreements |  |  | 15,200 | 39,500
Derivative assets not subject to master netting agreements |  |  | 10,200 | 33,700
Cash flow hedge length of time, maximum | 7 years | 5 years |  |
Cash flow hedge length of time, minimum | 3 years |  |  |
Hedged amount of foreign currency denominated loans |  |  | 1,500 | 3,800
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 |  |  | 5,600 | 6,200
Long Term Debt Hedged With Fair Value Interest Rate Derivatives Using Long Haul Method |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Other long term borrowings |  |  | 500,000 |
Net fair value of interest rate derivatives hedging subordinated debt |  |  | 200 | 7,300
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] |  |  |  |
Other long term borrowings |  |  | 400,000 |
Net fair value of interest rate derivatives hedging subordinated debt |  |  | 100 | 1,600
Additional Derivative Agreements | Derivative Instruments With Accelerated Termination Provisions |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Collateral received |  |  | 118,600 | 137,500
Securities posted collateral |  |  | 6,700 | 12,900
Net fair value of derivative assets with adjustable posting thresholds |  |  | 22,800 | 35,900
Net fair value of derivative liabilities with adjustable posting thresholds |  |  | 19,400 | 19,600
Additional Derivative Agreements | Derivative Instruments With Adjustable Collateral Posting Thresholds |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Collateral received |  |  | 119,300 | 137,600
Securities posted collateral |  |  | 18,900 | 39,300
Net fair value of derivative assets with adjustable posting thresholds |  |  | 23,300 | 35,900
Net fair value of derivative liabilities with adjustable posting thresholds |  |  | 34,500 | 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 | $ 250,000

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