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Employees benefits (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
F A F [Member]    
IfrsStatementLineItems [Line Items]    
Present value of actuarial liabilities R$ 3,348,786 R$ 3,121,348
Fair value of assets (3,647,431) (3,603,611)
(Surplus) Deficit (298,645) (482,263)
Irrecoverable surplus - (asset ceiling) 298,645 482,263
Net acturial asset
Beginning balance of irrecoverable surplus 482,263 207,230
Interest on irrecoverable surplus 47,021 18,152
Changes in irrecoverable surplus during the year (230,639) 256,881
Ending balance of irrecoverable surplus 298,645 482,263
Beginning balance of the present value of liabilities 3,121,348 3,340,497
Interest on actuarial obligations 293,231 283,241
Current service cost 18,153 23,189
Benefit paid (233,865) (213,804)
Actuarial losses - experience 81,782 (36,292)
Actuarial (gains) losses - economic hypotheses 68,137 (242,957)
Actuarial (gains) losses - demographic hypothesis (32,526)
Ending balance of actuarial liabilities 3,348,786 3,121,348
Beginning balance of the fair value of plan assets (3,603,611) (3,547,727)
Interest income on assets plan (340,252) (301,394)
Benefit paid 233,865 213,804
Return on assets higher (lower) than projection 62,567 31,706
Ending Balance of the fair value of the assets (3,647,431) (3,603,611)
Beginning balance of comprehensive income 23,190 26,741
Reversion to accumulated losses (23,190) (26,741)
Actuarial gains (losses) (149,919) 311,776
Return on assets higher (lower) than projection (62,567) (31,705)
Changes on irrecoverable surplus 230,639 (256,881)
Ending balance of comprehensive income 18,153 23,190
Current service costs (18,153) (23,190)
Interest on actuarial obligations (293,231) (283,241)
Projected return on assets 340,252 301,394
Interest on irrecoverable surplus (47,021) (18,153)
Costs recognized in statement of income (18,153) (23,190)
Costs of defined benefit (19,226) (18,153)
Estimated costs for the next year (19,226) (18,153)
Plan I I [Member]    
IfrsStatementLineItems [Line Items]    
Present value of actuarial liabilities 21,789 20,822
Fair value of assets (22,845) (22,745)
(Surplus) Deficit (1,056) (1,923)
Irrecoverable surplus - (asset ceiling) 1,056 1,923
Net acturial asset
Beginning balance of irrecoverable surplus 1,923
Interest on irrecoverable surplus 187
Changes in irrecoverable surplus during the year (1,054) 1,923
Ending balance of irrecoverable surplus 1,056 1,923
Beginning balance of the present value of liabilities 20,822 23,981
Interest on actuarial obligations 1,935 1,997
Current service cost
Benefit paid (1,947) (1,838)
Actuarial losses - experience 460 (1,358)
Actuarial (gains) losses - economic hypotheses 519 (1,414)
Actuarial (gains) losses - demographic hypothesis (546)
Ending balance of actuarial liabilities 21,789 20,822
Beginning balance of the fair value of plan assets (22,745) (22,298)
Interest income on assets plan (2,122) (1,851)
Benefit paid 1,947 1,838
Return on assets higher (lower) than projection 75 (434)
Ending Balance of the fair value of the assets (22,845) (22,745)
Beginning balance of comprehensive income 3,385 (2,485)
Reversion to accumulated losses (3,385) 2,485
Actuarial gains (losses) (979) 2,772
Return on assets higher (lower) than projection (75) 434
Changes on irrecoverable surplus 1,054 179
Ending balance of comprehensive income 3,385
Current service costs
Interest on actuarial obligations (1,935) (1,997)
Projected return on assets 2,122 1,851
Interest on irrecoverable surplus (187)
Costs recognized in statement of income (146)
Costs of defined benefit
Estimated costs for the next year