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Transfers of financial assets and servicing assets - Key economic assumptions used (Details) - Residential Mortgage | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
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 | 7.30% | 5.50% | 7.10% | 5.20%
Weighted average life | 9 years 2 months 12 days | 9 years 6 months | 9 years 2 months 12 days | 9 years 8 months 12 days
Discount rate (annual rate) | 9.60% | 10.70% | 9.60% | 10.50%
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 | 7.00% | 7.20% | 7.10% | 8.40%
Weighted average life | 8 years | 8 years 2 months 12 days | 8 years | 7 years 8 months 12 days
Discount rate (annual rate) | 11.00% | 10.00% | 10.70% | 9.80%

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- Definition Discount rate which is used to value residual cash flows generated by financial assets of the securitization, asset-backed financing arrangement, or similar transfer for initial fair value measurement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c)(1) -URI https://asc.fasb.org/extlink&oid=121570589&loc=d3e107207-111719 + Details
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- Definition Estimated rate of prepayment of principal on financial assets for initial fair value measurement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c)(2) -URI https://asc.fasb.org/extlink&oid=121570589&loc=d3e107207-111719 + Details
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- Definition Weighted average life of securitized assets for initial fair value measurement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c)(2) -URI https://asc.fasb.org/extlink&oid=121570589&loc=d3e107207-111719 + Details
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