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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Fair value of financial instruments (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
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