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Transfers of financial assets and servicing assets - Key economic assumptions used (Details) - Residential Mortgage
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
BPPR        
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]        
Prepayment speed 6.90% 7.40% 6.40% 7.00%
Weighted average life 9 years 2 months 12 days 9 years 8 months 12 days 9 years 4 months 24 days 9 years 1 month 6 days
Discount rate (annual rate) 9.80% 9.50% 9.60% 9.50%
PB        
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]        
Prepayment speed 6.30% 7.10% 6.20% 7.20%
Weighted average life 8 years 7 months 6 days 8 years 1 month 6 days 8 years 8 months 12 days 8 years
Discount rate (annual rate) 12.90% 10.50% 12.70% 10.50%