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SIGNIFICANT ACCOUNTING POLICIES - Property, plant and equipment, net (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Allowance for loan losses      
Allowance for loan losses recorded $ 0 $ 0 $ 0
Buildings      
Allowance for loan losses      
Estimated useful life 35 years    
Furniture, fixture and equipment      
Allowance for loan losses      
Estimated useful life 5 years    
Motor vehicles      
Allowance for loan losses      
Estimated useful life 5 years