Financial risk review - Narrative (Details)	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024
Guarantees and other financial credit enhancements
Disclosure of financial assets [line items]
Coverage ratio on loan portfolio	4.00%	9.00%

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

No definition available.

Name:	ifrs-full_DisclosureOfFinancialAssetsLineItems
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration