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Residential Loans - Geographic Concentration of Residential Loans Recorded on Consolidated Balance Sheet (Footnotes) (Detail) | Dec. 31, 2015 | Dec. 31, 2014
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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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