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Fair Value of Financial Instruments - Assets Measured at Fair Value on a Nonrecurring Basis (Details) - Residential loans held in securitization trusts – impaired loans, net - Fair Value, Measurements, Nonrecurring $ in Thousands	Dec. 31, 2019 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held in securitization trusts	$ 5,256
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held in securitization trusts	0
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held in securitization trusts	0
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held in securitization trusts	$ 5,256

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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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