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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Fair value of financial instruments (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Fair Value | Level 3 |  |
Fair value of financial instruments |  |
Loans | $ 119,000 | $ 109,000
Book Value |  |
Fair value of financial instruments |  |
Loans | $ 105,042 | $ 97,175

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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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