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Applicable laws and regulations (Details 3) - Financial assets impaired [member] - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Impaired loans $ 10,593 $ 61,845
Normal [Member]    
Impaired loans 0 0
Special mention loans    
Impaired loans 0 0
Substandards [Member]    
Impaired loans 10,593 0
Doubtful [Member]    
Impaired loans 0 0
Unrecoverable [Member]    
Impaired loans $ 0 $ 61,845