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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)	6 Months Ended
	Jun. 30, 2017 USD ($) $ / loan
Asset-backed securities issued
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	$ 692,606,000
Asset-backed securities issued | Minimum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Prepayment rate (annual CPR) (as a percent)	0.00%
Loss severity (as a percent)	20.00%
Discount rate (as a percent)	4.00%
Default rate (as a percent)	1.00%
Asset-backed securities issued | Maximum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Prepayment rate (annual CPR) (as a percent)	20.00%
Loss severity (as a percent)	32.00%
Discount rate (as a percent)	8.00%
Default rate (as a percent)	12.00%
Asset-backed securities issued | Weighted Average
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Prepayment rate (annual CPR) (as a percent)	16.00%
Loss severity (as a percent)	27.00%
Discount rate (as a percent)	5.00%
Default rate (as a 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	$ 3,027,340,000
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 (in dollars per loan) | $ / loan	2.59
Whole loan spread to swap rate (as a percent)	1.75%
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 (in dollars per loan) | $ / loan	3.56
Whole loan spread to swap rate (as a percent)	2.80%
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 (in dollars per loan) | $ / loan	3.50
Whole loan spread to swap rate (as a percent)	2.78%
Residential Jumbo Hybrid Loans Priced To Whole Loan Market Uncommitted To Sell
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	$ 130,776,000
Residential Jumbo Hybrid Loans Priced To Whole Loan Market Uncommitted To Sell | Minimum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Whole loan spread to swap rate (as a percent)	1.10%
Prepayment rate (annual CPR) (as a percent)	15.00%
Residential Jumbo Hybrid Loans Priced To Whole Loan Market Uncommitted To Sell | Maximum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Whole loan spread to swap rate (as a percent)	2.00%
Prepayment rate (annual CPR) (as a percent)	15.00%
Residential Jumbo Hybrid Loans Priced To Whole Loan Market Uncommitted To Sell | Weighted Average
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Whole loan spread to swap rate (as a percent)	1.63%
Prepayment rate (annual CPR) (as a percent)	15.00%
Residential Loans Priced To Whole Loan Market and Committed to Sell
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	$ 38,409,000
Residential Loans Priced To Whole Loan Market and Committed to Sell | Minimum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Whole loan committed sales price (in dollars per loan) | $ / loan	102.63
Residential Loans Priced To Whole Loan Market and Committed to Sell | Maximum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Whole loan committed sales price (in dollars per loan) | $ / loan	102.63
Residential Loans Priced To Whole Loan Market and Committed to Sell | Weighted Average
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Whole loan committed sales price (in dollars per loan) | $ / loan	102.63
Residential Loans Held For Investment at Fair Value
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	$ 707,686,000
Residential loans, at lower of cost or fair value
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	$ 856,000
Residential loans, at lower of cost or fair value | Minimum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Loss severity (as a percent)	15.00%
Residential loans, at lower of cost or fair value | Maximum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Loss severity (as a percent)	30.00%
Residential loans, at lower of cost or fair value | Weighted Average
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Loss severity (as a percent)	20.00%
Investment Securities
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	$ 1,218,503,000
Investment Securities | Minimum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Prepayment rate (annual CPR) (as a percent)	0.00%
Loss severity (as a percent)	0.00%
Discount rate (as a percent)	3.00%
Default rate (as a percent)	0.00%
Investment Securities | Maximum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Prepayment rate (annual CPR) (as a percent)	28.00%
Loss severity (as a percent)	40.00%
Discount rate (as a percent)	13.00%
Default rate (as a percent)	33.00%
Investment Securities | Weighted Average
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Prepayment rate (annual CPR) (as a percent)	9.00%
Loss severity (as a percent)	23.00%
Discount rate (as a percent)	5.00%
Default rate (as a percent)	3.00%
MSRs
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	$ 63,770,000
MSRs | Minimum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Prepayment rate (annual CPR) (as a percent)	5.00%
Discount rate (as a percent)	10.00%
Per loan annual cost to service	$ 82
MSRs | Maximum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Prepayment rate (annual CPR) (as a percent)	31.00%
Discount rate (as a percent)	18.00%
Per loan annual cost to service	$ 82
MSRs | Weighted Average
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Prepayment rate (annual CPR) (as a percent)	10.00%
Discount rate (as a percent)	11.00%
Per loan annual cost to service	$ 82
Guarantee asset
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	$ 3,288,000
Guarantee asset | Minimum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Prepayment rate (annual CPR) (as a percent)	13.00%
Discount rate (as a percent)	11.00%
Guarantee asset | Maximum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Prepayment rate (annual CPR) (as a percent)	13.00%
Discount rate (as a percent)	11.00%
Guarantee asset | Weighted Average
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Prepayment rate (annual CPR) (as a percent)	13.00%
Discount rate (as a percent)	11.00%
REO
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	$ 4,118,000
REO | Minimum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Loss severity (as a percent)	4.00%
REO | Maximum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Loss severity (as a percent)	100.00%
REO | Weighted Average
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Loss severity (as a percent)	30.00%
Loan purchase commitments
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	$ 1,120,000
Loan purchase commitments | Minimum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Whole loan spread to TBA (in dollars per loan) | $ / loan	2.59
Whole loan spread to swap rate (as a percent)	1.75%
Prepayment rate (annual CPR) (as a percent)	15.00%
MSR Multiple	0.6
Pull-through rate (as a percent)	10.00%
Whole loan spread to swap rate - hybrid (as a percent)	1.10%
Loan purchase commitments | Maximum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Whole loan spread to TBA (in dollars per loan) | $ / loan	3.56
Whole loan spread to swap rate (as a percent)	2.80%
Prepayment rate (annual CPR) (as a percent)	15.00%
MSR Multiple	5.1
Pull-through rate (as a percent)	100.00%
Whole loan spread to swap rate - hybrid (as a percent)	1.90%
Loan purchase commitments | Weighted Average
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Whole loan spread to TBA (in dollars per loan) | $ / loan	3.53
Whole loan spread to swap rate (as a percent)	2.79%
Prepayment rate (annual CPR) (as a percent)	15.00%
MSR Multiple	3.6
Pull-through rate (as a percent)	71.00%
Whole loan spread to swap rate - hybrid (as a percent)	1.43%

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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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Fair Value Inputs, Pull Through Rate

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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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- 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=66048111&loc=d3e19207-110258

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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=66048111&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=66048111&loc=d3e19207-110258

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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=66048111&loc=d3e19207-110258

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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 (a)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19279-110258

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