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Servicing rights - Amortization (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Future amortization expense for the servicing rights    
2020 $ 4,369  
2021 5,167  
2022 4,491  
2023 3,882  
2024 3,337  
Thereafter 10,234  
Total $ 31,480 $ 30,795