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Related party transactions (Details 1) - shares shares in Thousands | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Stockholders Sterrebeeck B V [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Ownership interest, common shares | 1,809,583 | 1,809,583 | 1,809,583
Ownership interest common shares, percentage | 47.40% | 47.40% | 47.40%
Ownership interest, preferred shares | 1,733,644 | 1,733,644 | 1,733,644
Ownership interest preferred shares, percentage | 47.10% | 47.10% | 47.10%
Ownership interest, total shares | 3,543,227 | 3,543,227 | 3,543,227
Ownership interest total shares, total | 47.30% | 47.30% | 47.30%
Stockholders Grupo Empresarial Santander S L [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Ownership interest, common shares | 1,627,891 | 1,627,891 | 1,627,891
Ownership interest common shares, percentage | 42.60% | 42.60% | 42.60%
Ownership interest, preferred shares | 1,539,863 | 1,539,863 | 1,539,863
Ownership interest preferred shares, percentage | 41.90% | 41.90% | 41.90%
Ownership interest, total shares | 3,167,755 | 3,167,754 | 3,167,754
Ownership interest total shares, total | 42.20% | 42.20% | 42.20%
Stockholders Banco Santander S A [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Ownership interest, common shares | 2,696 | 2,696 | 2,696
Ownership interest common shares, percentage | 0.10% | 0.10% | 0.10%
Ownership interest, preferred shares |  |  |
Ownership interest preferred shares, percentage |  |  |
Ownership interest, total shares | 2,696 | 2,696 | 2,696
Ownership interest total shares, total |  |  |
Stockholders Directors [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Ownership interest, common shares | 3,083 | 2,828 |
Ownership interest common shares, percentage | 0.10% | 0.10% |
Ownership interest, preferred shares | 3,083 | 2,828 |
Ownership interest preferred shares, percentage | 0.10% | 0.10% |
Ownership interest, total shares | 6,167 | 5,656 |
Ownership interest total shares, total | 0.10% | 0.10% |
Stockholders Other [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Ownership interest, common shares | 361,775 | 356,245 | 348,148
Ownership interest common shares, percentage | 9.50% | 9.30% | 9.10%
Ownership interest, preferred shares | 389,579 | 384,050 | 375,952
Ownership interest preferred shares, percentage | 10.60% | 10.40% | 10.20%
Ownership interest, total shares | 751,354 | 740,295 | 724,100
Ownership interest total shares, total | 10.00% | 9.90% | 9.80%
Stockholders Total [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Ownership interest, common shares | 3,805,028 | 3,799,243 | 3,791,502
Ownership interest common shares, percentage | 99.60% | 99.50% | 99.30%
Ownership interest, preferred shares | 3,666,169 | 3,660,385 | 3,652,643
Ownership interest preferred shares, percentage | 99.60% | 99.50% | 99.30%
Ownership interest, total shares | 7,471,199 | 7,459,628 | 7,444,145
Ownership interest total shares, total | 99.60% | 99.50% | 99.30%
Treasury Share [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Ownership interest, common shares | 13,666 | 19,452 | 27,193
Ownership interest common shares, percentage | 0.40% | 0.50% | 0.70%
Ownership interest, preferred shares | 13,666 | 19,452 | 27,193
Ownership interest preferred shares, percentage | 0.40% | 0.50% | 0.70%
Ownership interest, total shares | 27,332 | 38,904 | 54,386
Ownership interest total shares, total | 0.40% | 0.50% | 0.70%
Stockholders And Treasury Shares Total [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Ownership interest, common shares | 3,818,694 | 3,818,695 | 3,818,695
Ownership interest common shares, percentage | 100.00% | 100.00% | 100.00%
Ownership interest, preferred shares | 3,679,835 | 3,679,837 | 3,679,836
Ownership interest preferred shares, percentage | 100.00% | 100.00% | 100.00%
Ownership interest, total shares | 7,498,531 | 7,498,532 | 7,498,531
Ownership interest total shares, total | 100.00% | 100.00% | 100.00%
Stockholders Free Float [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Ownership interest, common shares | 361,775 | 356,245 | 348,148
Ownership interest common shares, percentage | 9.50% | 9.30% | 10.10%
Ownership interest, preferred shares | 389,579 | 384,050 | 375,952
Ownership interest preferred shares, percentage | 10.60% | 10.40% | 10.20%
Ownership interest, total shares | 751,354 | 740,295 | 724,100
Ownership interest total shares, total | 10.00% | 9.90% | 9.70%
Administrators [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Ownership interest, common shares |  |  | 3,184
Ownership interest common shares, percentage |  |  | 0.10%
Ownership interest, preferred shares |  |  | 3,184
Ownership interest preferred shares, percentage |  |  | 0.10%
Ownership interest, total shares |  |  | 6,368
Ownership interest total shares, total |  |  | 0.10%

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