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Significant accounting policies (Details) - BRL (R$) R$ in Thousands | 4 Months Ended | 8 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
May 06, 2021 | Dec. 31, 2021 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | May 07, 2021 | Dec. 31, 2018
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Assets |  | R$ 36,626,337 | R$ 36,626,337 | R$ 19,921,613 |  |  |
Liabilities |  | 28,176,554 | 28,176,554 | 16,597,398 |  |  |
Equity | R$ 3,127,985 | 8,449,784 | 8,449,784 | 3,324,215 | R$ 2,161,938 | R$ 3,127,985 | R$ 932,188
Other comprehensive income | (141,312) | (106,073) | (247,385) | 26,687 | (2,102) |  |
Revenue |  |  | 2,221,823 | 1,011,531 | 712,224 |  |
Profit / (loss) for the year | R$ (40,437) | (14,629) | (55,068) | 30,686 | 30,370 |  |
Dividends paid |  |  | R$ (19,680) | R$ (37,868) | (43,571) |  |
HoldFin |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Share in the capital |  |  | 100.00% | 0.00% |  |  |
Assets |  | 2,670,530 | R$ 2,670,530 |  |  |  |
Liabilities |  | 14,405 | 14,405 |  |  |  |
Equity |  | 2,656,124 | 2,656,124 |  |  |  |
Revenue |  |  | 19,626 |  |  |  |
Profit / (loss) for the year |  |  | R$ (6,069) |  |  |  |
Banco Inter S.A. |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Share in the capital |  |  | 31.40% | 0.00% |  |  |
Assets |  | 36,433,640 | R$ 36,433,640 | R$ 19,766,642 | 10,062,373 |  |
Liabilities |  | 27,945,001 | 27,945,001 | 16,463,954 | 7,861,356 |  |
Equity |  | 8,488,640 | 8,488,640 | 3,302,688 | 2,201,017 |  |
Other comprehensive income |  |  | (212,195) | 37,056 | 1,562 |  |
Revenue |  |  | 3,208,747 | 1,471,926 | 1,102,869 |  |
Profit / (loss) for the year |  |  | 34,625 | (7,197) | 78,881 |  |
Dividends paid |  |  | R$ (41,491) | R$ (39,949) | (51,252) |  |
Inter Distribuidora de Ttulos e Valores Mobilirios Ltda. |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Share in the capital |  |  | 30.90% | 98.30% |  |  |
Assets |  | 368,212 | R$ 368,212 | R$ 75,900 | 43,317 |  |
Liabilities |  | 317,647 | 317,647 | 46,595 | 11,725 |  |
Equity |  | 50,565 | 50,565 | 29,303 | 31,592 |  |
Revenue |  |  | 87,936 | 36,894 | 21,904 |  |
Profit / (loss) for the year |  |  | R$ 21,222 | R$ (2,254) | 7,196 |  |
Inter Digital Corretora e Consultoria de Seguros Ltda. |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Share in the capital |  |  | 18.80% | 60.00% |  |  |
Assets |  | 124,671 | R$ 124,671 | R$ 81,289 | 11,095 |  |
Liabilities |  | 69,890 | 69,890 | 45,773 | 4,814 |  |
Equity |  | 54,781 | 54,781 | 35,516 | 6,281 |  |
Revenue |  |  | 88,846 | 43,215 | 20,940 |  |
Profit / (loss) for the year |  |  | 64,761 | R$ 29,235 | 11,527 |  |
Dividends paid |  |  | R$ (35,647) |  |  |  |
Inter Marketplace Ltda. |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Share in the capital |  |  | 31.40% | 99.90% |  |  |
Assets |  | 231,051 | R$ 231,051 | R$ 69,383 | 4,885 |  |
Liabilities |  | 90,756 | 90,756 | 47,957 | 14 |  |
Equity |  | 140,295 | 140,295 | 21,426 | 4,871 |  |
Revenue |  |  | 235,551 | 63,998 | 15 |  |
Profit / (loss) for the year |  |  | R$ 118,550 | R$ 16,555 | (130) |  |
Inter Asset Holding S.A. |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Share in the capital |  |  | 22.00% | 70.00% |  |  |
Assets |  | 7,148 | R$ 7,148 | R$ 5,829 | 4,980 |  |
Liabilities |  | 3,098 | 3,098 | 2,418 | 118 |  |
Equity |  | 4,050 | 4,050 | 3,411 | 4,862 |  |
Revenue |  |  | 8,835 | 5,457 | 10,331 |  |
Profit / (loss) for the year |  |  | R$ 6,833 | R$ 3,763 | (139) |  |
Inter Titulos Fundo de Investimento |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Share in the capital |  |  | 30.70% | 96.50% |  |  |
Assets |  | 50,195 | R$ 50,195 | R$ 49,870 | 56,198 |  |
Liabilities |  | 304 | 304 | 156 | 792 |  |
Equity |  | 49,891 | 49,891 | 49,714 | 55,406 |  |
Revenue |  |  | 21,786 | 24,164 | 11,250 |  |
Profit / (loss) for the year |  |  | R$ 2,557 | R$ (5,136) | R$ 5,405 |  |
BMA Inter Fundo De Investimento Em Direitos Creditrios Multissetorial |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Share in the capital |  |  | 28.30% | 81.20% |  |  |
Assets |  | 389,497 | R$ 389,497 | R$ 170,653 |  |  |
Liabilities |  | 1,339 | 1,339 | 1,169 |  |  |
Equity |  | 388,158 | 388,158 | 169,484 |  |  |
Revenue |  |  | 42,561 | 7,722 |  |  |
Profit / (loss) for the year |  |  | R$ 32,688 | R$ 5,999 |  |  |
TBI Fundo De Investimento Renda Fixa Credito Privado |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Share in the capital |  |  | 31.40% | 100.00% |  |  |
Assets |  | 443,843 | R$ 443,843 | R$ 204,835 |  |  |
Liabilities |  | 154 | 154 | 3,239 |  |  |
Equity |  | 443,689 | 443,689 | 201,596 |  |  |
Revenue |  |  | 125,238 | 7,360 |  |  |
Profit / (loss) for the year |  |  | R$ 21,508 | R$ 696 |  |  |
TBI Fundo De Investimento Crdito Privado Investimento Exterior |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Share in the capital |  |  | 31.40% | 0.00% |  |  |
Assets |  | 14,725 | R$ 14,725 |  |  |  |
Liabilities |  | 63 | 63 |  |  |  |
Equity |  | 14,662 | 14,662 |  |  |  |
Revenue |  |  | 325 |  |  |  |
Profit / (loss) for the year |  |  | R$ (337) |  |  |  |
IM Designs Desenvolvimento de Software Ltda. |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Share in the capital |  |  | 15.70% | 0.00% |  |  |
Assets |  | 6,145 | R$ 6,145 |  |  |  |
Liabilities |  | 573 | 573 |  |  |  |
Equity |  | 5,572 | 5,572 |  |  |  |
Revenue |  |  | 3,777 |  |  |  |
Profit / (loss) for the year |  |  | R$ (125) |  |  |  |
Meu Acerto |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Share in the capital |  |  | 18.90% | 0.00% |  |  |
Assets |  | 18,862 | R$ 18,862 |  |  |  |
Liabilities |  | 1,815 | 1,815 |  |  |  |
Equity |  | 17,047 | 17,047 |  |  |  |
Revenue |  |  | 10,220 |  |  |  |
Profit / (loss) for the year |  |  | R$ (4,025) |  |  |  |
Inter Asset Gesto de Recursos Ltda |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Share in the capital |  |  | 22.00% | 0.00% |  |  |
Assets |  | 7,128 | R$ 7,128 |  |  |  |
Liabilities |  | 3,097 | 3,097 |  |  |  |
Equity |  | 4,031 | 4,031 |  |  |  |
Revenue |  |  | 14,131 | R$ 12,748 |  |  |
Profit / (loss) for the year |  |  | R$ 8,182 |  |  |  |
Inter Caf Ltda. |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Share in the capital |  |  | 31.40% | 0.00% |  |  |
Assets |  | 553 | R$ 553 |  |  |  |
Liabilities |  | 1,187 | 1,187 |  |  |  |
Equity |  | (634) | (634) |  |  |  |
Revenue |  |  | 2,080 |  |  |  |
Profit / (loss) for the year |  |  | R$ (702) |  |  |  |
Inter Boutiques Ltda. |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Share in the capital |  |  | 31.40% | 0.00% |  |  |
Assets |  | 2,198 | R$ 2,198 |  |  |  |
Liabilities |  | 1,822 | 1,822 |  |  |  |
Equity |  | 377 | 377 |  |  |  |
Revenue |  |  | 2,202 |  |  |  |
Profit / (loss) for the year |  |  | R$ 599 |  |  |  |
Inter Food Ltda. |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Share in the capital |  |  | 22.00% | 70.00% |  |  |
Assets |  | 2,729 | R$ 2,729 |  |  |  |
Liabilities |  | 333 | 333 |  |  |  |
Equity |  | R$ 2,396 | 2,396 |  |  |  |
Revenue |  |  | 2,266 |  |  |  |
Profit / (loss) for the year |  |  | R$ 398 |  |  |  |

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