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Derivatives - Narrative (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Mar. 31, 2017 | Mar. 31, 2016 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Total trading revenues | $ 54,500,000 | $ 29,900,000 |  |  | $ 99,000,000.0 | $ 68,000,000.0 |
Term borrowings | 1,186,646,000 |  |  |  | 1,186,646,000 |  | $ 1,170,963,000
Cash flow hedge length of time |  |  |  | 5 years |  |  |
Hedged amount of foreign currency denominated loans | 16,000,000.0 |  |  |  | 16,000,000.0 |  | 11,000,000.0
Cash Flow Hedge | Hedged Items |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Variability in cash flows related to debt instruments (primarily loans) |  |  |  | $ 250,000,000 |  |  |
Notional |  |  | $ 650,000,000 |  |  |  |
Visa Class B Shares |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Derivative liabilities related to sale | 26,500,000 |  |  |  | 26,500,000 |  | 31,500,000
Long Term Debt Hedged With Fair Value Interest Rate Derivatives Using Long Haul Method |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Term borrowings | 500,000,000.0 |  |  |  | 500,000,000.0 |  |
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] |  |  |  |  |  |  |
Term borrowings | 400,000,000.0 |  |  |  | 400,000,000.0 |  |
Additional Derivative Agreements | Derivative Instruments With Adjustable Collateral Posting Thresholds |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Net fair value of derivative assets with adjustable posting thresholds | 62,200,000 |  |  |  | 62,200,000 |  | 20,700,000
Net fair value of derivative liabilities with adjustable posting thresholds | 15,800,000 |  |  |  | 15,800,000 |  | 37,800,000
Collateral received | 116,500,000 |  |  |  | 116,500,000 |  | 86,600,000
Securities posted collateral | 30,600,000 |  |  |  | 30,600,000 |  | 16,200,000
Additional Derivative Agreements | Derivative Instruments With Accelerated Termination Provisions |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Net fair value of derivative assets with adjustable posting thresholds | 62,200,000 |  |  |  | 62,200,000 |  | 19,000,000.0
Net fair value of derivative liabilities with adjustable posting thresholds | 6,700,000 |  |  |  | 6,700,000 |  | 33,200,000
Collateral received | 116,500,000 |  |  |  | 116,500,000 |  | 84,500,000
Securities posted collateral | 21,500,000 |  |  |  | 21,500,000 |  | 15,200,000
Minimum | Cash Flow Hedge | Hedged Items |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Derivative, term of contract |  |  | 3 years |  |  |  |
Maximum | Cash Flow Hedge | Hedged Items |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Derivative, term of contract |  |  | 7 years |  |  |  |
Counterparties |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Collateral cash receivables | 96,200,000 |  |  |  | 96,200,000 |  | 76,000,000.0
Collateral cash payables | $ 44,100,000 |  |  |  | $ 44,100,000 |  | $ 34,000,000.0

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