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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)	3 Months Ended
	Mar. 31, 2016 USD ($) $ / loan
Loan Purchase Commitments | Minimum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Spread to swap rate	1.30%
Loan Purchase Commitments | Maximum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Spread to swap rate	1.80%
Loan Purchase Commitments | Weighted Average
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Spread to swap rate	1.54%
Asset-backed Securities
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	$ 907,023,000
Asset-backed Securities | Minimum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount rate	5.00%
Prepayment rate	5.00%
Credit support	0.00%
Loss severity	20.00%
Default rate	1.00%
Asset-backed Securities | Maximum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount rate	9.00%
Prepayment rate	20.00%
Credit support	33.00%
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	12.00%
Credit support	9.00%
Loss severity	27.00%
Default rate	7.00%
Commercial Secured Borrowings
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	$ 65,181,000
Commercial Secured Borrowings | Minimum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Spread to swap rate	2.12%
Credit support	25.00%
Commercial Secured Borrowings | Maximum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Spread to swap rate	2.12%
Credit support	25.00%
Commercial Secured Borrowings | Weighted Average
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Spread to swap rate	2.12%
Credit support	25.00%
Residential Loans Priced To Securitization and Whole Loan Market, Uncommitted to Sell
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	$ 2,494,912,000
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	3.13
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
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	4.12
Residential Jumbo Hybrid Loans Priced To Whole Loan Market Uncommitted To Sell
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	$ 83,124,000
Residential Jumbo Hybrid Loans Priced To Whole Loan Market Uncommitted To Sell | Minimum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Prepayment rate	15.00%
Spread to swap rate	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	15.00%
Spread to swap rate	1.80%
Residential Jumbo Hybrid Loans Priced To Whole Loan Market Uncommitted To Sell | Weighted Average
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Prepayment rate	15.00%
Spread to swap rate	1.51%
Residential Loans Priced To Whole Loan Market and Committed to Sell
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	$ 204,204,000
Residential Loans Priced To Whole Loan Market and Committed to Sell | Minimum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Committed Sales Price | $ / loan	101.91
Residential Loans Priced To Whole Loan Market and Committed to Sell | Maximum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Committed Sales Price | $ / loan	102.30
Residential Loans Priced To Whole Loan Market and Committed to Sell | Weighted Average
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Committed Sales Price | $ / loan	102.14
Residential Loans Held For Investment at Fair Value
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	$ 930,027,000
Residential Loans at Lower of Cost or Fair Value
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	$ 1,076,000
Residential Loans at Lower of Cost or Fair Value | Minimum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Loss severity	15.00%
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	29.00%
Commercial Loans at Fair Value
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	$ 69,674,000
Commercial Loans at Fair Value | Minimum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Spread to swap rate	2.20%
Credit support	25.00%
Commercial Loans at Fair Value | Maximum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Spread to swap rate	2.20%
Credit support	25.00%
Commercial Loans at Fair Value | Weighted Average
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Spread to swap rate	2.20%
Credit support	25.00%
Investment Securities
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	$ 919,927,000
Investment Securities | Minimum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount rate	5.00%
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	48.00%
Loss severity	65.00%
Default rate	35.00%
Investment Securities | Weighted Average
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount rate	6.00%
Prepayment rate	14.00%
Credit support	4.00%
Loss severity	23.00%
Default rate	3.00%
Mortgage servicing rights
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	$ 126,620,000
Mortgage servicing rights | Minimum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount rate	8.00%
Prepayment rate	4.00%
Per loan annual cost to service	$ 72
Mortgage servicing rights | Maximum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount rate	13.00%
Prepayment rate	60.00%
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	15.00%
Per loan annual cost to service	$ 78
Guarantee asset
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	$ 4,272,000
Guarantee asset | Minimum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount rate	11.00%
Prepayment rate	19.00%
Guarantee asset | Maximum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount rate	11.00%
Prepayment rate	19.00%
Guarantee asset | Weighted Average
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount rate	11.00%
Prepayment rate	19.00%
REO
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	$ 1,285,000
REO | Minimum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Loss severity	11.00%
REO | Maximum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Loss severity	93.00%
REO | Weighted Average
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Loss severity	35.00%
Loan Purchase Commitments
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	$ 4,639,000
Loan Purchase Commitments | Minimum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Prepayment rate	15.00%
Whole loan spread to TBA (usd per loan) | $ / loan	3.35
MSR Multiple	0.3
Fallout rate	2.00%
Loan Purchase Commitments | Maximum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Prepayment rate	15.00%
Whole loan spread to TBA (usd per loan) | $ / loan	4.35
MSR Multiple	6.6
Fallout rate	98.00%
Loan Purchase Commitments | Weighted Average
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Prepayment rate	15.00%
Whole loan spread to TBA (usd per loan) | $ / loan	4.16
MSR Multiple	2.8
Fallout rate	44.00%

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Fair Value Inputs, Committed Sales Price

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Fair Value Inputs, Credit Spreads

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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, 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, 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=36462937&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=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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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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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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-Topic 820
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-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19279-110258

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