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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 (Details)	9 Months Ended
	Sep. 30, 2016 USD ($) $ / shares $ / loan
Asset-backed securities issued
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	$ 819,868,000
Asset-backed securities issued | Minimum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Prepayment rate (annual CPR) (percent)	2.00%
Credit support (percent)	0.00%
Loss severity (percent)	20.00%
Discount rate (percent)	5.00%
Default rate (percent)	1.00%
Asset-backed securities issued | Maximum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Prepayment rate (annual CPR) (percent)	20.00%
Credit support (percent)	22.00%
Loss severity (percent)	32.00%
Discount rate (percent)	9.00%
Default rate (percent)	12.00%
Asset-backed securities issued | Weighted Average
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Prepayment rate (annual CPR) (percent)	15.00%
Credit support (percent)	13.00%
Loss severity (percent)	27.00%
Discount rate (percent)	5.00%
Default rate (percent)	7.00%
Residential Loans Priced To Securitization and Whole Loan Market, Uncommitted to Sell
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	$ 2,404,070,000
Residential Loans Priced To Securitization and Whole Loan Market, Uncommitted to Sell | Minimum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Whole loan spread to TBA (usd per loan) | $ / loan	3.04
Whole loan spread to swap rate	2.75%
Residential Loans Priced To Securitization and Whole Loan Market, Uncommitted to Sell | Maximum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Whole loan spread to TBA (usd per loan) | $ / loan	4.35
Whole loan spread to swap rate	3.25%
Residential Loans Priced To Securitization and Whole Loan Market, Uncommitted to Sell | Weighted Average
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Whole loan spread to TBA (usd per loan) | $ / loan	4.31
Whole loan spread to swap rate	3.24%
Residential Jumbo Hybrid Loans Priced To Whole Loan Market Uncommitted To Sell
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	$ 160,047,000
Residential Jumbo Hybrid Loans Priced To Whole Loan Market Uncommitted To Sell | Minimum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Prepayment rate (annual CPR) (percent)	15.00%
Whole loan spread to swap rate (percent)	1.30%
Residential Jumbo Hybrid Loans Priced To Whole Loan Market Uncommitted To Sell | Maximum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Prepayment rate (annual CPR) (percent)	15.00%
Whole loan spread to swap rate (percent)	2.75%
Residential Jumbo Hybrid Loans Priced To Whole Loan Market Uncommitted To Sell | Weighted Average
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Prepayment rate (annual CPR) (percent)	15.00%
Whole loan spread to swap rate (percent)	1.50%
Residential Loans Priced To Whole Loan Market and Committed to Sell
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	$ 905,797,000
Residential Loans Priced To Whole Loan Market and Committed to Sell | Minimum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
IO multiple	2.8
Prepayment rate (annual CPR) (percent)	15.00%
Senior spread to TBA price (in dollars per share) | $ / shares	$ 2.13
Credit support (percent)	5.00%
Whole loan committed sales price (USD per loan) | $ / loan	101.42
Residential Loans Priced To Whole Loan Market and Committed to Sell | Maximum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
IO multiple	2.8
Prepayment rate (annual CPR) (percent)	15.00%
Senior spread to TBA price (in dollars per share) | $ / shares	$ 2.13
Credit support (percent)	5.00%
Whole loan committed sales price (USD per loan) | $ / loan	103.08
Residential Loans Priced To Whole Loan Market and Committed to Sell | Weighted Average
Fair Value Inputs, Assets, Quantitative Information [Line Items]
IO multiple	2.8
Prepayment rate (annual CPR) (percent)	15.00%
Senior spread to TBA price (in dollars per share) | $ / shares	$ 2.13
Credit support (percent)	5.00%
Whole loan committed sales price (USD per loan) | $ / loan	102.22
Residential Loans Held For Investment at Fair Value
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	$ 839,976,000
Residential Loans Held For Investment at Fair Value | Minimum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Subordinate spread to swap rate	2.00%
Residential Loans Held For Investment at Fair Value | Maximum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Subordinate spread to swap rate	8.57%
Residential Loans Held For Investment at Fair Value | Weighted Average
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Subordinate spread to swap rate	3.13%
Residential loans, at lower of cost or fair value
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	$ 954,000
Residential loans, at lower of cost or fair value | Minimum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Loss severity (percent)	15.00%
Residential loans, at lower of cost or fair value | Maximum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Loss severity (percent)	30.00%
Residential loans, at lower of cost or fair value | Weighted Average
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Loss severity (percent)	17.00%
Investment Securities
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	$ 936,910,000
Investment Securities | Minimum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Prepayment rate (annual CPR) (percent)	1.00%
Credit support (percent)	0.00%
Loss severity (percent)	20.00%
Discount rate (percent)	5.00%
Default rate (percent)	0.00%
Investment Securities | Maximum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Prepayment rate (annual CPR) (percent)	41.00%
Credit support (percent)	48.00%
Loss severity (percent)	65.00%
Discount rate (percent)	12.00%
Default rate (percent)	35.00%
Investment Securities | Weighted Average
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Prepayment rate (annual CPR) (percent)	18.00%
Credit support (percent)	3.00%
Loss severity (percent)	21.00%
Discount rate (percent)	7.00%
Default rate (percent)	2.00%
MSRs
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	$ 106,009,000
MSRs | Minimum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Prepayment rate (annual CPR) (percent)	9.00%
Discount rate (percent)	11.00%
Per loan annual cost to service	$ 72
MSRs | Maximum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Prepayment rate (annual CPR) (percent)	25.00%
Discount rate (percent)	11.00%
Per loan annual cost to service	$ 82
MSRs | Weighted Average
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Prepayment rate (annual CPR) (percent)	18.00%
Discount rate (percent)	11.00%
Per loan annual cost to service	$ 78
Guarantee asset
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	$ 3,627,000
Guarantee asset | Minimum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Prepayment rate (annual CPR) (percent)	18.00%
Discount rate (percent)	11.00%
Guarantee asset | Maximum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Prepayment rate (annual CPR) (percent)	18.00%
Discount rate (percent)	11.00%
Guarantee asset | Weighted Average
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Prepayment rate (annual CPR) (percent)	18.00%
Discount rate (percent)	11.00%
REO
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	$ 5,396,000
REO | Minimum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Loss severity (percent)	2.00%
REO | Maximum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Loss severity (percent)	100.00%
REO | Weighted Average
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Loss severity (percent)	21.00%
Loan purchase commitments
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	$ 5,479,000
Loan purchase commitments | Minimum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Prepayment rate (annual CPR) (percent)	15.00%
Whole loan spread to TBA (usd per loan) | $ / loan	3.04
Whole loan spread to swap rate (percent)	1.30%
Whole loan spread to swap rate	2.75%
MSR Multiple	0.9
Fallout rate (percent)	2.00%
Loan purchase commitments | Maximum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Prepayment rate (annual CPR) (percent)	15.00%
Whole loan spread to TBA (usd per loan) | $ / loan	4.20
Whole loan spread to swap rate (percent)	2.75%
Whole loan spread to swap rate	3.25%
MSR Multiple	4.7
Fallout rate (percent)	85.00%
Loan purchase commitments | Weighted Average
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Prepayment rate (annual CPR) (percent)	15.00%
Whole loan spread to TBA (usd per loan) | $ / loan	4.16
Whole loan spread to swap rate (percent)	1.56%
Whole loan spread to swap rate	3.24%
MSR Multiple	2.7
Fallout rate (percent)	28.00%

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Percentage of credit support for financial asset.

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Fair Value Inputs, Fallout Rate

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Fair Value Inputs, Interest Only (IO) Multiple

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Fair Value Inputs, Mortgage Servicing Right (MSR) Multiple

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Fair Value Inputs, Per Loan Annual Cost To Service

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- Definition

Fair Value Inputs Senior Credit Spreads

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Fair Value Inputs Subordinate Credit Spreads

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- Definition

Fair Value Inputs, Whole Loan Committed Sales Price

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Fair Value Inputs Whole Loan Credit Spreads

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Fair Value Inputs, Whole Loan Spread

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Fair Value Inputs, Whole Loan Spread To Swap

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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

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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

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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

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- Definition

Percentage of likelihood a loan will not be repaid and instead default, 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

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- Definition

Fair value of financial instrument classified as derivative asset (liability) after deduction of derivative liability (asset), measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ 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 (c)(1)
-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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-Publisher FASB
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-Topic 820
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-Section 50
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-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19279-110258

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