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Portfolio loans - Summary of TDR loans (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Restructured loans    
Total loans $ 5,978 $ 5,707
In compliance with modified terms    
Restructured loans    
Total loans 4,191 5,005
30-89 days past due    
Restructured loans    
Total loans 125  
Included in non-performing loans    
Restructured loans    
Total loans $ 1,662 $ 702