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DERIVATIVE FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS - Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Fair value of financial instruments    
Book value of loans $ 101,024 $ 97,175
Level 3    
Fair value of financial instruments    
Fair value of loans $ 117,000 $ 109,000