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Business Purpose Residential Loans (Details)			2 Months Ended	3 Months Ended
	Mar. 31, 2019 USD ($) loan	Dec. 31, 2018 USD ($) loan	Feb. 28, 2019 USD ($)	Mar. 31, 2019 USD ($) loan	Mar. 31, 2018 USD ($)
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loan principal	$ 400,000			$ 400,000
Purchases of held-for-sale loans				989,977,000	$ 1,820,002,000
Proceeds from sales of held-for-sale loans				851,331,000	1,581,806,000
Transfer to REO				5,035,000	$ 1,268,000
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	$ 56,696,000	$ 28,460,000		56,696,000
Number of loans | loan	26	11
Loan principal	$ 54,000,000	$ 28,000,000		$ 54,000,000
Number of loans past due | loan	0			0
Purchases of held-for-sale loans				$ 19,000,000
Proceeds from sales of held-for-sale loans				0
Gain (loss) on investments				1,000,000
Collateral amounts	$ 49,000,000	$ 28,000,000		$ 49,000,000
Weighted average coupon rate	5.72%			5.72%
Contract maturities				7 years
Weighted average original loan-to-value (LTV)	65.00%			65.00%
Weighted-average debt service coverage ratio				1.28
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	$ 103,916,000	$ 112,798,000		$ 103,916,000
Number of loans | loan		157		158
Loan principal	$ 103,000,000	$ 112,000,000		$ 103,000,000
Number of loans past due | loan	7	7		7
Purchases of held-for-sale loans			$ 10,000,000
Proceeds from sales of held-for-sale loans				$ 0
Gain (loss) on investments				(300,000)
Collateral amounts	$ 93,000,000	$ 98,000,000		$ 93,000,000
Weighted average coupon rate	9.13%			9.13%
Weighted average original loan-to-value (LTV)	75.00%			75.00%
Unpaid principal balance on delinquent or foreclosure loans	$ 9,000,000	$ 12,000,000		$ 9,000,000
Number of loans in foreclosure | loan	4	4		4
Loans in foreclosure amount	$ 8,000,000	$ 11,000,000		$ 8,000,000
Number of loans transferred | loan				1
Transfer to REO				$ 5,000,000
Weighted average original Fair Isaac Corporation (FICO) score	677			677
Estimated rehabilitated loan-to-value ratio	60.00%			60.00%
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
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				$ 36,000,000
Proceeds from loan originations to third parties				21,000,000
Market valuations gains and losses, net				86,000
Residential loans	$ 160,612,000	$ 141,258,000		160,612,000
Fee income				500,000
5 Arches, LLC | 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]
Collateral amounts	5,000,000			5,000,000
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	$ 4,000,000			$ 4,000,000

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