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Portfolio loans - Summary of Restructured Loans (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Restructured loans    
Total loans $ 12,335 $ 8,838
In compliance with modified terms    
Restructured loans    
Total loans 8,778 8,319
30-89 days past due    
Restructured loans    
Total loans   127
Included in non-performing loans    
Restructured loans    
Total loans $ 3,557 $ 392