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Summary of Other Assets (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Line Items]
Margin receivable	$ 56,217	$ 31,149
Investment receivable	24,814	8,923
Restricted investments	11,319
Other pledged collateral	5,000	5,000
FHLBC stock	4,846
REO	3,349	3,661
Prepaid expenses	2,350	1,850
Fixed assets and leasehold improvements	2,273	1,232
Other	2,600	1,825
Total Other Assets	$ 112,768	$ 53,640

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Interest, dividends, rents, ancillary and other revenues earned but not yet received by the entity on its investments.

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Federal Home Loan Bank (FHLB) stock represents an equity interest in a FHLB. It does not have a readily determinable fair value because its ownership is restricted and it lacks a market (liquidity).

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