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Shareholders' equity (Details 1) - BRL (R$) R$ / shares in Units, R$ in Thousands | Dec. 31, 2025 | Dec. 31, 2024
--- | --- | ---
IfrsStatementLineItems [Line Items] |  |
Real | R$ 7,620,000 | R$ 6,000,000
Interest On Capital [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Real | R$ 1,500,000 | R$ 1,500,000
Interest On Capital [Member] | Ordinary shares [member] |  |
IfrsStatementLineItems [Line Items] |  |
Shares | R$ 191.68 | R$ 191.84
Interest On Capital [Member] | Preference shares [member] |  |
IfrsStatementLineItems [Line Items] |  |
Shares | 210.84 | 221.02
Interest On Capital [Member] | Shares Units [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Shares | 402.52 | 412.86
Interest On Capital [Member] | Ordinary Shares 1 [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Shares | 162.92 | 163.06
Interest On Capital [Member] | Preference Shares 1 [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Shares | 179.22 | 179.37
Interest On Capital [Member] | Shares Units 1 [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Shares | R$ 342.14 | R$ 342.43
Interest On Capital 1 [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Real | R$ 1,500,000 | R$ 1,500,000
Interest On Capital 1 [Member] | Ordinary shares [member] |  |
IfrsStatementLineItems [Line Items] |  |
Shares | R$ 191.39 | R$ 191.62
Interest On Capital 1 [Member] | Preference shares [member] |  |
IfrsStatementLineItems [Line Items] |  |
Shares | 210.53 | 210.78
Interest On Capital 1 [Member] | Shares Units [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Shares | 401.92 | 402.40
Interest On Capital 1 [Member] | Ordinary Shares 1 [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Shares | 162.68 | 162.88
Interest On Capital 1 [Member] | Preference Shares 1 [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Shares | 178.95 | 179.16
Interest On Capital 1 [Member] | Shares Units 1 [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Shares | R$ 341.63 | R$ 342.04
Interest On Capital 2 [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Real | R$ 2,000,000 | R$ 1,500,000
Interest On Capital 2 [Member] | Ordinary shares [member] |  |
IfrsStatementLineItems [Line Items] |  |
Shares | R$ 255.18 | R$ 191.67
Interest On Capital 2 [Member] | Preference shares [member] |  |
IfrsStatementLineItems [Line Items] |  |
Shares | 280.70 | 210.83
Interest On Capital 2 [Member] | Shares Units [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Shares | 535.88 | 402.50
Interest On Capital 2 [Member] | Ordinary Shares 1 [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Shares | 216.90 | 162.92
Interest On Capital 2 [Member] | Preference Shares 1 [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Shares | 238.59 | 179.21
Interest On Capital 2 [Member] | Shares Units 1 [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Shares | R$ 455.49 | R$ 342.13
Interest On Capital 3 [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Real | R$ 2,000,000 | R$ 1,300,000
Interest On Capital 3 [Member] | Ordinary shares [member] |  |
IfrsStatementLineItems [Line Items] |  |
Shares | R$ 255.18 | R$ 166.10
Interest On Capital 3 [Member] | Preference shares [member] |  |
IfrsStatementLineItems [Line Items] |  |
Shares | 280.70 | 182.71
Interest On Capital 3 [Member] | Shares Units [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Shares | 535.88 | 348.81
Interest On Capital 3 [Member] | Ordinary Shares 1 [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Shares | 216.90 | 141.18
Interest On Capital 3 [Member] | Preference Shares 1 [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Shares | R$ 238.59 | 155.30
Interest On Capital 3 [Member] | Shares Units 1 [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Shares |  | R$ 296.48
Dividends [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Real | R$ 620,000 | R$ 200,000
Dividends [Member] | Ordinary shares [member] |  |
IfrsStatementLineItems [Line Items] |  |
Shares | R$ 79.10 | R$ 25.55
Dividends [Member] | Preference shares [member] |  |
IfrsStatementLineItems [Line Items] |  |
Shares | 87.01 | 28.11
Dividends [Member] | Shares Units [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Shares | 166.11 | 53.66
Dividends [Member] | Ordinary Shares 1 [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Shares | 67.23 | 25.55
Dividends [Member] | Preference Shares 1 [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Shares | 73.96 | 28.11
Dividends [Member] | Shares Units 1 [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Shares | R$ 141.19 | R$ 53.66

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