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Fair Value of Financial Instruments - Assets Measured at Fair Value on a Nonrecurring Basis (Details) - Fair Value, Measurements, Nonrecurring - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Residential mortgage loans held in securitization trusts – impaired loans, net
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Residential mortgage loans held in securitization trusts – impaired loans, net	$ 10,317	$ 9,050
Residential mortgage loans held in securitization trusts – impaired loans, net | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Residential mortgage loans held in securitization trusts – impaired loans, net	0	0
Residential mortgage loans held in securitization trusts – impaired loans, net | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Residential mortgage loans held in securitization trusts – impaired loans, net	0	0
Residential mortgage loans held in securitization trusts – impaired loans, net | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Residential mortgage loans held in securitization trusts – impaired loans, net	10,317	9,050
Real estate owned held in residential securitization trusts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Real estate owned held in residential securitization trusts	111	150
Real estate owned held in residential securitization trusts | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Real estate owned held in residential securitization trusts	0	0
Real estate owned held in residential securitization trusts | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Real estate owned held in residential securitization trusts	0	0
Real estate owned held in residential securitization trusts | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Real estate owned held in residential securitization trusts	$ 111	$ 150

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Total of (1) improvements, (2) held-for-sale, (3) land and land under development, (4) construction-in-process, (5) mortgage loans held-in-inventory, and (6) other real estate investments which are considered inventory due to being held for sale or disposition.

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Fair value of securitized, pay-through debt securities collateralized by real estate mortgage loans classified as held-to-maturity.

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