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Fair value measurements - Summary of Level 3 financial instruments (Details) - Level 3
$ in Thousands
Sep. 30, 2021
USD ($)
Dec. 31, 2020
USD ($)
Discount rate    
Fair value measurements    
Weighted average measurement input   0.093
Minimum | Prepayment speed    
Fair value measurements    
Weighted average measurement input   0.15
Maximum | Prepayment speed    
Fair value measurements    
Weighted average measurement input   0.22
Weighted Average | Prepayment speed    
Fair value measurements    
Weighted average measurement input   0.22
Discounted cash flow    
Fair value measurements    
Mortgage servicing rights   $ 3,001
Residential loan | Fair value of property or collateral    
Fair value measurements    
Fair value $ 125  
Commercial loans | Fair value of property or collateral    
Fair value measurements    
Fair value   $ 387