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Business Purpose Loans (Details)	3 Months Ended	9 Months Ended
	Sep. 30, 2018 USD ($) loan	Sep. 30, 2018 USD ($) loan	Sep. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Purchases of held-for-sale loans		$ 5,596,326,000	$ 3,760,110,000
Proceeds from sales of held-for-sale loans		4,097,211,000	$ 3,079,877,000
Business purpose loans, at fair value
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Residential loans	$ 115,620,000	$ 115,620,000		$ 0
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]
Number of loans | loan		4
Loan Principal	20,000,000	$ 20,000,000
Residential loans	$ 20,105,000	$ 20,105,000		0
Number of loans past due | loan	0	0
Number of loans in foreclosure | loan	0	0
Purchases of held-for-sale loans	$ 20,000,000	$ 20,000,000
Proceeds from sales of held-for-sale loans	0	0
Gain (loss) on investments	(100,000)	(100,000)
Collateral amounts	$ 20,000,000	$ 20,000,000
Weighted average coupon rate	5.71%	5.71%
Weighted average original loan-to-value (LTV)	65.00%	65.00%
Weighted-average debt service coverage ratio		1.25
Contract maturities		7 years
Fix and flip loan warehouse
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Collateral amounts	$ 92,000,000	$ 92,000,000
Fix-and-flip loans held-for-investment
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Number of loans | loan		128
Loan Principal	95,000,000	$ 95,000,000
Residential loans	$ 95,515,000	$ 95,515,000		$ 0
Number of loans past due | loan	2	2
Purchases of held-for-sale loans	$ 106,000,000
Proceeds from sales of held-for-sale loans	0	$ 0
Gain (loss) on investments	$ 100,000	$ 100,000
Weighted average coupon rate	9.14%	9.14%
Weighted average original loan-to-value (LTV)	76.00%	76.00%
Weighted average original Fair Isaac Corporation (FICO) score	718	718
Unpaid principal balance on delinquent or foreclosure loans	$ 1,000,000	$ 1,000,000
Estimated rehabilitated loan-to-value ratio	57.00%	57.00%
Fix-and-flip loans held-for-investment | Minimum
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Contract maturities		6 months
Fix-and-flip loans held-for-investment | Maximum
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Contract maturities		24 months

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