Derivative Instruments and Hedging Activities Derivative Financial Information (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Liability, Fair Value, Gross Liability	$ (41,935)	$ (36,102)
Derivative Asset, Fair Value, Gross Asset	54,765	44,637
Derivative Asset, Fair Value, Gross Liability	0	0
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	54,765	44,637
Derivative Asset, Not Offset, Policy Election Deduction	(34,935)	(25,187)
Derivative, Collateral, Obligation to Return Cash	(7,362)	(9,918)
Derivative Asset, Fair Value, Amount Offset Against Collateral	12,468	9,532
Derivative Liability, Fair Value, Gross Asset	0	0
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	(41,935)	(36,102)
Derivative Liability, Not Offset, Policy Election Deduction	34,935	25,187
Derivative, Collateral, Right to Reclaim Cash	827	2,048
Derivative Liability, Fair Value, Amount Offset Against Collateral	(6,173)	(8,867)
Ria Operations [Member] \| Foreign Exchange Contract [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Notional Amount	159,000	251,100
Corporate Operations [Member] \| Foreign Exchange Contract [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Notional Amount	43,000	64,300
xe Operations [Member] [Domain] \| Trading Revenue [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Trading Activity, Gain	18,900
HiFX Operations [Member] \| Trading Revenue [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Trading Activity, Gain		69,200	$ 72,500
HiFX Operations [Member] \| Foreign Exchange Contract [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Notional Amount	$ 1,200,000	$ 1,800,000
Maximum [Member] \| Ria Operations [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Foreign currency forward contract term	14 days

Foreign currency forward contract term, in days

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- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

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-Article 12
-Section 13
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Fair value of liability associated with 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.

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Fair value 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, elected not to be offset, deducted from derivative assets.

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Amount of obligation to return cash collateral under master netting arrangements that have not been offset against derivative assets.

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Fair value, before effects of master netting arrangements, of a 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. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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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.

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Fair value, before effects of master netting arrangements, of a financial liability or 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. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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Fair value, after offset of derivative asset, of financial liability or 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, elected not to be and before offset against a right to receive collateral under a master netting arrangement. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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Fair value of asset associated with financial liability or 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.

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Fair value of financial liability or 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, elected not to be offset, deducted from derivative liabilities.

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