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Income Tax - Reconciliation of Effective Tax Rate (Details) - ARS ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Reconciliation of average effective tax rate and applicable tax rate [abstract] |  |  |  |  |  |
Profit before income tax | $ 18,096,387 | $ 4,256,031 | $ 3,971,956 |  |  |
Income tax rate | 30.00% | 30.00% | 35.00% |  |  |
Income tax using the Bank's income tax rate | $ 5,428,916 | $ 1,276,809 | $ 1,390,185 |  |  |
Permanent Differences [Abstract] |  |  |  |  |  |
Tax -exempt income | (481,363) | (302,054) | (397,886) |  |  |
Non-deductible expenses | 64,150 | 107,659 | 55,237 |  |  |
Change in tax rate | (941,342) | (443,693) | (1,357,294) |  |  |
Other | (15,641) | (27,109) | (42,209) |  |  |
Net monetary inflation adjustment | 7,705,386 | 8,234,425 | 4,629,817 |  |  |
Sub total | 11,760,106 | 8,846,037 | 4,277,850 |  |  |
Inflation adjustment | (9,687,939) | (2,175,295) | (3,166,423) |  |  |
Income tax expense | $ 2,072,167 | $ 6,670,742 | $ 1,111,427 | $ 555,002 | $ 647,945 | $ 264,257
Effective tax rate | 11.00% | 157.00% | 28.00% |  |  |

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