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Residential Loans - Geographic Concentration of Residential Loans Recorded on Consolidated Balance Sheet (Footnotes) (Detail)	Dec. 31, 2015	Dec. 31, 2014
Other states | Residential Loans Held For Investment at Fair Value
Concentration Risk [Line Items]
Concentration risk percentage per other state	5.00%	5.00%

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Concentration Risk, Percentage, Per Other State

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