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Summary of Significant Accounting Policies (Details)	3 Months Ended
	Mar. 31, 2018
Securities Borrowed and Securities Loaned
Minimum initial collateral advanced or received expressed as a percentage of fair value of the underlying securities borrowed or loaned	102.00%
Furniture, fixtures and equipment | Minimum
Securities Borrowed and Securities Loaned
Estimated useful lives	3 years
Furniture, fixtures and equipment | Maximum
Securities Borrowed and Securities Loaned
Estimated useful lives	7 years
Capitalized software | Minimum
Securities Borrowed and Securities Loaned
Estimated useful lives	1 year 6 months
Capitalized software | Maximum
Securities Borrowed and Securities Loaned
Estimated useful lives	2 years 6 months

X

- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

+ Details

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- References

No definition available.

+ Details

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X

- Definition

Represents the minimum initial collateral advanced or received expressed as a percentage of fair value of the underlying securities borrowed or loaned.

+ References

No definition available.

+ Details

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- Details

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- Details

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- Details

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