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Derivatives - Narrative (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2016 | Dec. 31, 2018
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Total trading revenues | $ 44,500,000 | $ 38,000,000 |  |  |
Term borrowings | 1,177,926,000 |  |  |  | $ 1,170,963,000
Cash flow hedge length of time |  |  |  | 5 years |
Hedged amount of foreign currency denominated loans | 15,200,000 |  |  |  | 11,000,000
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 | 29,000,000 |  |  |  | 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 |  |  |  |
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 |  |  |  |
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 | 27,200,000 |  |  |  | 20,700,000
Net fair value of derivative liabilities with adjustable posting thresholds | 16,400,000 |  |  |  | 37,800,000
Collateral received | 86,300,000 |  |  |  | 86,600,000
Securities posted collateral | 18,600,000 |  |  |  | 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 | 27,200,000 |  |  |  | 19,000,000
Net fair value of derivative liabilities with adjustable posting thresholds | 10,900,000 |  |  |  | 33,200,000
Collateral received | 86,300,000 |  |  |  | 84,500,000
Securities posted collateral | 13,500,000 |  |  |  | 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 | 79,600,000 |  |  |  | 76,000,000
Collateral cash payables | $ 33,200,000 |  |  |  | $ 34,000,000

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- Definition Fair value, after offset of derivative liability, of financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, before offset against an obligation to return collateral under a master netting arrangement. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226006-175313 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109980867&loc=d3e41678-113959 + Details
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- Definition Maximum period the entity is hedging its exposure to the variability in future cash flows for forecasted transactions, excluding those forecasted transactions related to the payment of variable interest on existing financial instruments, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=112277219&loc=d3e80748-113994 + Details
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