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Operations of the Bank - Additional Information (Detail) - ARS ($) $ / shares in Units, $ in Thousands | Aug. 10, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
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Discription Of Business And Nature Of Operation [line items] |  |  |  |
Number of shares |  | 639,413,408 | 639,413,408 | 669,663,021
Misiones Provincial Government [member] |  |  |  |
Discription Of Business And Nature Of Operation [line items] |  |  |  |
Deposits liability |  | $ 16,239,739 | $ 9,305,984 |
Deposits liability related to court deposits |  | 808,570 | 942,301 |
Salta Provincial Government [member] |  |  |  |
Discription Of Business And Nature Of Operation [line items] |  |  |  |
Deposits liability |  | 3,777,068 | 5,933,781 |
Deposits liability related to court deposits |  | 1,240,932 | 1,235,163 |
Jujuy Provincial Government [member] |  |  |  |
Discription Of Business And Nature Of Operation [line items] |  |  |  |
Deposits liability |  | 10,910,810 | 1,607,209 |
Deposits liability related to court deposits |  | 1,168,418 | 874,074 |
Banco del Tucuman SA [member] |  |  |  |
Discription Of Business And Nature Of Operation [line items] |  |  |  |
Deposits liability |  | 14,274,476 | 4,902,149 |
Deposits liability related to court deposits |  | 3,536,735 | 3,342,313 |
Bank granted loans to government |  | $ 2,860,617 | $ 7,606,547 |
Banco del Tucuman SA [member] | Class B common registered non-endorsable shares [member] |  |  |  |
Discription Of Business And Nature Of Operation [line items] |  |  |  |
Shares acquired | 43,960 |  |  |
Face value per share | $ 100 |  |  |
Percentage of shares acquired to common shares and votes | 10.00% |  |  |
Banco del Tucuman SA [member] | Major business combination [member] |  |  |  |
Discription Of Business And Nature Of Operation [line items] |  |  |  |
Face value per share | $ 1 |  |  |
Stock exchange rate | $ 0.65258 |  |  |
Number of shares | 15,662 |  |  |

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- Definition The amount of loans to government made by the entity. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_55&doctype=Standard -URIDate 2020-01-01 + Details
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