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Transfers of financial assets and servicing assets - Key economic assumptions used (Details) - Residential Mortgage
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
BPPR    
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement    
Prepayment speed 5.20% 8.80%
Weighted average life (in years) 9 years 4 months 24 days 7 years 2 months 12 days
Discount rate (annual rate) 10.30% 10.50%
PB    
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement    
Prepayment speed 10.00% 21.40%
Weighted average life (in years) 6 years 10 months 24 days 3 years 6 months
Discount rate (annual rate) 10.00% 11.00%