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Fair Value Measurement - Sensitivity of Fair Value (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
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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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- Definition 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. + References 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 + Details
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