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Derivatives - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Mar. 31, 2017 | Mar. 31, 2016 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Total trading revenues | $ 34,300 | $ 45,000 |  |  | $ 102,300 | $ 133,300 |
Term borrowings | 1,200,134 |  |  |  | 1,200,134 |  | $ 1,218,097
Cash flow hedge length of time |  |  |  | 5 years |  |  |
Hedged amount of foreign currency denominated loans | 10,600 |  |  |  | 10,600 |  | 1,500
Cash Flow Hedges | Hedging Instruments |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Variability in cash flows related to debt instruments (primarily loans) |  |  |  | $ 250,000 |  |  |
Notional amount |  |  | $ 650,000 |  |  |  |
Cash Flow Hedges | Hedging Instruments | Minimum |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Initial duration |  |  | 3 years |  |  |  |
Cash Flow Hedges | Hedging Instruments | Maximum |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Initial duration |  |  | 7 years |  |  |  |
Long Term Debt Hedged With Fair Value Interest Rate Derivatives Using Long Haul Method |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Term borrowings | 500,000 |  |  |  | 500,000 |  |
Net fair value of interest rate derivatives hedging | 0 |  |  |  | 0 |  | 200
Derivative Instruments With Adjustable Collateral Posting Thresholds | Additional Derivative Agreements |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Net fair value of derivative assets with adjustable posting thresholds | 22,000 |  |  |  | 22,000 |  | 23,300
Net fair value of derivative liabilities with adjustable posting thresholds | 57,700 |  |  |  | 57,700 |  | 34,500
Collateral received | 92,300 |  |  |  | 92,300 |  | 119,300
Securities posted collateral | 20,400 |  |  |  | 20,400 |  | 18,900
Derivative Instruments With Accelerated Termination Provisions | Additional Derivative Agreements |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Net fair value of derivative assets with adjustable posting thresholds | 18,100 |  |  |  | 18,100 |  | 22,800
Net fair value of derivative liabilities with adjustable posting thresholds | 54,500 |  |  |  | 54,500 |  | 19,400
Collateral received | 88,200 |  |  |  | 88,200 |  | 118,600
Securities posted collateral | 20,900 |  |  |  | 20,900 |  | 6,700
FTBNA | Long Term Debt Hedged With Fair Value Interest Rate Derivatives Using Long Haul Method |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Term borrowings | 400,000 |  |  |  | 400,000 |  |
Net fair value of interest rate derivatives hedging | 0 |  |  |  | 0 |  | 100
Certain Counterparties |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Collateral cash receivables | 81,700 |  |  |  | 81,700 |  | 60,300
Collateral cash payables | 50,300 |  |  |  | 50,300 |  | 49,700
Visa Class B Shares |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Derivative liabilities related to sale | 34,200 |  |  |  | 34,200 |  | $ 5,600
Derivative liabilities related to sale, transaction executed | $ 28,100 |  |  |  | $ 28,100 |  |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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