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Servicing rights - Amortization (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Future amortization expense for the servicing rights    
2020 $ 3,282  
2021 5,920  
2022 5,143  
2023 4,447  
2024 3,820  
Thereafter 11,504  
Total $ 34,116 $ 30,795