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Subsequent Events - Additional Information (Detail) (Residential Loans, USD $) |  | 1 Months Ended
--- | --- | ---
Sep. 30, 2014 | Nov. 02, 2014 Subsequent Event
Subsequent Event [Line Items] |  |
Amount of loans planned to be purchased | $ 1,300,000,000 |
Residential mortgage loans closed and purchased |  | $ 597,000,000

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- Definition Amount of Loans Expected to be Purchased + References No definition available. + Details
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- Definition The cash outflow used to purchase loans that are secured with real estate mortgage and are held with the intention to resell in the near future. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 21 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3461-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 230 -Section 55 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=34726456&loc=d3e60097-112785 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3367-108585 + Details
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- Details
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