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Fair Value of Financial Instruments - Quantitative Information about Significant Unobservable Inputs Used in Valuation of Level 3 Assets and Liabilities Measured at Fair Value (Detail) | 9 Months Ended
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Sep. 30, 2015 USD ($) $ / shares $ / senior_security $ / loan
Asset-backed Securities |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Fair Value | $ 1,105,588,000
Asset-backed Securities | Minimum |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Discount rate | 5.00%
Prepayment rate | 6.00%
Credit support | 0.00%
Loss severity | 20.00%
Default rate | 0.00%
Asset-backed Securities | Maximum |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Discount rate | 9.00%
Prepayment rate | 20.00%
Credit support | 70.00%
Loss severity | 32.00%
Default rate | 12.00%
Asset-backed Securities | Weighted Average |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Discount rate | 5.00%
Prepayment rate | 13.00%
Credit support | 12.00%
Loss severity | 27.00%
Default rate | 6.00%
Commercial Secured Borrowings |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Fair Value | $ 65,578,000
Commercial Secured Borrowings | Minimum |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Spread to swap rate | 1.94%
Credit support | 23.00%
Commercial Secured Borrowings | Maximum |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Spread to swap rate | 1.95%
Credit support | 23.00%
Commercial Secured Borrowings | Weighted Average |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Spread to swap rate | 1.94%
Credit support | 23.00%
Residential Loans Priced To Securitization and Whole Loan Market, Uncommitted to Sell |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Fair Value | $ 2,032,815,000
Residential Loans Priced To Securitization and Whole Loan Market, Uncommitted to Sell | Minimum |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
IO Multiple | 3.8
Prepayment rate | 12.00%
Senior credit spread to TBA (usd per senior security) | $ / senior_security | 3.56
Spread to swap rate | 3.73%
Credit support | 5.00%
Whole loan spread to TBA (usd per loan) | $ / loan | 2.90
Residential Loans Priced To Securitization and Whole Loan Market, Uncommitted to Sell | Maximum |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
IO Multiple | 4.0
Prepayment rate | 15.00%
Senior credit spread to TBA (usd per senior security) | $ / senior_security | 3.56
Spread to swap rate | 3.73%
Credit support | 5.00%
Whole loan spread to TBA (usd per loan) | $ / loan | 4.27
Residential Loans Priced To Securitization and Whole Loan Market, Uncommitted to Sell | Weighted Average |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
IO Multiple | 3.8
Prepayment rate | 14.00%
Senior credit spread to TBA (usd per senior security) | $ / senior_security | 3.56
Spread to swap rate | 3.73%
Credit support | 5.00%
Whole loan spread to TBA (usd per loan) | $ / loan | 4.08
Residential Jumbo Hybrid Loans Priced To Whole Loan Market Uncommitted To Sell |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Fair Value | $ 158,149,000
Residential Jumbo Hybrid Loans Priced To Whole Loan Market Uncommitted To Sell | Minimum |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Spread to swap rate | 1.25%
Residential Jumbo Hybrid Loans Priced To Whole Loan Market Uncommitted To Sell | Maximum |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Spread to swap rate | 1.65%
Residential Jumbo Hybrid Loans Priced To Whole Loan Market Uncommitted To Sell | Weighted Average |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Spread to swap rate | 1.38%
Residential Loans Priced To Whole Loan Market and Committed to Sell |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Fair Value | $ 437,704,000
Residential Loans Priced To Whole Loan Market and Committed to Sell | Minimum |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Committed Sales Price | $ / shares | $ 102.1
Residential Loans Priced To Whole Loan Market and Committed to Sell | Maximum |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Committed Sales Price | $ / shares | 103
Residential Loans Priced To Whole Loan Market and Committed to Sell | Weighted Average |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Committed Sales Price | $ / shares | $ 102.4
Residential Loans Held For Investment at Fair Value |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Fair Value | $ 1,170,246,000
Residential Loans at Lower of Cost or Fair Value |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Fair Value | $ 1,099,000
Residential Loans at Lower of Cost or Fair Value | Minimum |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Loss severity | 13.00%
Residential Loans at Lower of Cost or Fair Value | Maximum |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Loss severity | 30.00%
Residential Loans at Lower of Cost or Fair Value | Weighted Average |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Loss severity | 21.00%
Commercial Loans at Fair Value |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Fair Value | $ 150,852,000
Commercial Loans at Fair Value | Minimum |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Spread to swap rate | 1.95%
Credit support | 23.00%
Commercial Loans at Fair Value | Maximum |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Spread to swap rate | 1.95%
Credit support | 23.00%
Commercial Loans at Fair Value | Weighted Average |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Spread to swap rate | 1.95%
Credit support | 23.00%
Investment Securities |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Fair Value | $ 1,085,224,000
Investment Securities | Minimum |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Discount rate | 4.00%
Prepayment rate | 1.00%
Credit support | 0.00%
Loss severity | 20.00%
Default rate | 0.00%
Investment Securities | Maximum |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Discount rate | 12.00%
Prepayment rate | 35.00%
Credit support | 49.00%
Loss severity | 65.00%
Default rate | 35.00%
Investment Securities | Weighted Average |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Discount rate | 7.00%
Prepayment rate | 13.00%
Credit support | 4.00%
Loss severity | 34.00%
Default rate | 8.00%
Mortgage servicing rights |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Fair Value | $ 162,726,000
Mortgage servicing rights | Minimum |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Discount rate | 8.00%
Prepayment rate | 5.00%
Per loan annual cost to service | $ 72
Mortgage servicing rights | Maximum |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Discount rate | 25.00%
Prepayment rate | 55.00%
Per loan annual cost to service | $ 82
Mortgage servicing rights | Weighted Average |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Discount rate | 10.00%
Prepayment rate | 12.00%
Per loan annual cost to service | $ 78
Guarantee asset |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Fair Value | $ 5,120,000
Guarantee asset | Minimum |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Discount rate | 10.00%
Prepayment rate | 16.00%
Guarantee asset | Maximum |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Discount rate | 10.00%
Prepayment rate | 16.00%
Guarantee asset | Weighted Average |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Discount rate | 10.00%
Prepayment rate | 16.00%
REO |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Fair Value | $ 3,120,000
REO | Minimum |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Loss severity | 0.00%
REO | Maximum |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Loss severity | 89.00%
REO | Weighted Average |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Loss severity | 52.00%
Loan Purchase Commitments |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Fair Value | $ 9,687,000
Loan Purchase Commitments | Minimum |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
MSR Multiple | 0
Fallout rate | 2.00%
Loan Purchase Commitments | Maximum |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
MSR Multiple | 5.0
Fallout rate | 98.00%
Loan Purchase Commitments | Weighted Average |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
MSR Multiple | 3.0
Fallout rate | 34.00%

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- Definition Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Loss, including interest and principal, incurred on a defaulted security, expressed as a percentage of the original principal balance, used as an input to measure fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Rate at which loans or a loan portfolio are expected to prepay principal balances, used as an input to measure fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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