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Business Purpose Residential Loans (Details)			2 Months Ended	3 Months Ended	4 Months Ended	6 Months Ended
	Jun. 30, 2019 USD ($) loan	Dec. 31, 2018 USD ($) loan	Feb. 28, 2019 USD ($)	Jun. 30, 2019 USD ($) loan	Jun. 30, 2019 USD ($) loan	Jun. 30, 2019 USD ($) loan	Jun. 30, 2018 USD ($)
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Purchases of held-for-sale loans						$ 2,534,886,000	$ 3,772,494,000
Proceeds from sales of held-for-sale loans						2,123,794,000	2,966,508,000
Transfer to REO						5,098,000	$ 1,835,000
Total Business Purpose Residential Loans
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Proceeds from loan originations				$ 134,000,000
Proceeds from loan originations to third parties				23,000,000
Market valuations gains and losses, net					$ 1,000,000
Fee income					3,000,000
Residential loans	$ 250,854,000	$ 141,258,000		250,854,000	250,854,000	250,854,000
Single-family rental loans, held-for-sale at fair value
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Residential loans	$ 91,501,000	$ 28,460,000		91,501,000	91,501,000	91,501,000
Number of loans | loan	43	11
Loan principal	$ 87,000,000	$ 28,000,000		$ 87,000,000	$ 87,000,000	$ 87,000,000
Number of loans past due | loan	0			0	0	0
Purchases of held-for-sale loans			$ 19,000,000	$ 33,000,000	$ 41,000,000
Proceeds from sales of held-for-sale loans				0
Gain (loss) on investments				1,000,000		$ 2,000,000
Collateral amounts	$ 71,000,000	$ 28,000,000		$ 71,000,000	$ 71,000,000	$ 71,000,000
Weighted average coupon rate	5.54%			5.54%	5.54%	5.54%
Contract maturities						6 years
Weighted average original loan-to-value (LTV)	66.00%			66.00%	66.00%	66.00%
Weighted-average debt service coverage ratio						1.33
Number of loans in foreclosure | loan		0
Residential bridge loans, held-for-investment at fair value
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Residential loans	$ 159,353,000	$ 112,798,000		$ 159,353,000	$ 159,353,000	$ 159,353,000
Number of loans | loan	274	157
Loan principal	$ 158,000,000	$ 112,000,000		$ 158,000,000	$ 158,000,000	$ 158,000,000
Number of loans past due | loan	11	7		11	11	11
Purchases of held-for-sale loans			$ 10,000,000	$ 79,000,000	$ 86,000,000
Gain (loss) on investments				(300,000)		$ (600,000)
Collateral amounts	$ 144,000,000	$ 98,000,000		$ 144,000,000	$ 144,000,000	$ 144,000,000
Weighted average coupon rate	9.08%			9.08%	9.08%	9.08%
Weighted average original loan-to-value (LTV)	74.00%			74.00%	74.00%	74.00%
Unpaid principal balance on delinquent or foreclosure loans	$ 12,000,000	$ 12,000,000		$ 12,000,000	$ 12,000,000	$ 12,000,000
Number of loans in foreclosure | loan	9	4		9	9	9
Loans in foreclosure amount	$ 7,000,000	$ 11,000,000		$ 7,000,000	$ 7,000,000	$ 7,000,000
Number of loans transferred | loan						1
Transfer to REO						$ 5,000,000
Weighted average original Fair Isaac Corporation (FICO) score	690			690	690	690
Residential bridge loans, held-for-investment at fair value | Minimum
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Contract maturities						6 months
Residential bridge loans, held-for-investment at fair value | Maximum
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Contract maturities						24 months
Residential Bridge Loans Held-for-investment Transferred To REO
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Gain (loss) on investments				$ (100,000)		$ (400,000)
Commitment To Fund Residential Bridge Loan
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Commitment to fund loan	$ 33,000,000			$ 33,000,000	$ 33,000,000	$ 33,000,000
Total Business Purpose Residential Loans
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Proceeds from loan originations					170,000,000
Proceeds from loan originations to third parties					$ 44,000,000

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