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Fair Value of Financial Instruments - Assets Measured at Fair Value on a Nonrecurring Basis (Details) - Fair Value, Measurements, Nonrecurring - Residential mortgage loans held in securitization trusts – impaired loans, net - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Residential mortgage loans held in securitization trusts – impaired loans, net | $ 5,590 | $ 5,921
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
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
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 | $ 5,590 | $ 5,921

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Fair value of securitized, pay-through debt securities collateralized by real estate mortgage loans classified as held-to-maturity. + References No definition available. + Details
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