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Fair Value Measurement - Sensitivity of Fair Value (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Loans (at fair value)
Discount rates
100 basis point increase	$ (714)	$ (979)
200 basis point increase	(1,415)	(1,939)
Expected credit loss rates on underlying loans
10% adverse change	(1,087)	(1,303)
20% adverse change	(2,126)	(2,611)
Fair Value, Inputs, Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Aggregate fair value of loans purchased and held by ULT	57,189	78,460
Fair Value, Inputs, Level 3 | Loans (at fair value)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Aggregate fair value of loans purchased and held by ULT	$ 57,189	$ 78,460

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Sensitivity Analysis of Fair Value, Assets, Impact of 100 Basis Point Increase In Discount Rates

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Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-URI http://asc.fasb.org/subtopic&trid=2196772

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