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Fair value measurements - Summary of Level 3 financial instruments (Details) - Level 3 - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2020
Dec. 31, 2019
Fair value measurements    
Mortgage servicing rights $ 6,260  
Fair value   $ 25
Discount rate 9.30%  
Minimum    
Fair value measurements    
Prepayment speed percentage 11.20%  
Maximum    
Fair value measurements    
Prepayment speed percentage 21.30%  
Weighted Average    
Fair value measurements    
Prepayment speed percentage 17.50%  
Residential land    
Fair value measurements    
Fair value   $ 25
Residential loan | Fair Value of Property or Collateral    
Fair value measurements    
Appraised value, selling cost   7.00%