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Business Purpose Residential Loans - Geographic Concentration of Business Purpose Loans (Details)	12 Months Ended
	Dec. 31, 2018
Single-family rental loans, held-for-sale at fair value
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	100.00%
Single-family rental loans, held-for-sale at fair value | Florida
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	69.00%
Single-family rental loans, held-for-sale at fair value | Texas
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	14.00%
Single-family rental loans, held-for-sale at fair value | California
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	0.00%
Single-family rental loans, held-for-sale at fair value | Utah
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	0.00%
Single-family rental loans, held-for-sale at fair value | Other states (none greater than 5%)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	17.00%
Residential bridge loans held-for-investment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	100.00%
Residential bridge loans held-for-investment | Florida
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	7.00%
Residential bridge loans held-for-investment | Texas
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	0.00%
Residential bridge loans held-for-investment | California
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	79.00%
Residential bridge loans held-for-investment | Utah
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	5.00%
Residential bridge loans held-for-investment | Other states (none greater than 5%)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	9.00%

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
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