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Segment Reporting - Business Profit Or Loss Segments (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
Business Segments Profit Or Loss [Line Items] |  |  |  |  |  |
Interest And Other Income of Business Segments | $ 66,288,027 | $ 48,817,686 | $ 36,542,676 |  |  |
Fee And Commission Income Of Business Segments | 8,178,542 | 10,880,863 | 9,060,625 |  |  |
Gains (Losses) On Financial Assets And Liabilities At Fair Value Through Profit Or Loss, Net | 11,462,033 | 178,204 | 6,709,089 |  |  |
Gains (Losses) On Derecognition Of Financial Assets Not Measured At Fair Value Through Profit Or Loss | (59,405) | (210,350) | 18,434 |  |  |
Exchange Differences, Net | 10,302,892 | 9,982,224 | 5,195,194 |  |  |
Other Operating Income | 8,801,349 | 3,241,213 | 2,989,237 |  |  |
Operating Income Before Derecognition Of Financial Assets | 104,973,438 | 72,889,840 | 60,515,255 |  |  |
Impairment Loss On Financial Assets | 15,752,414 | 5,897,990 | 3,888,609 |  |  |
Subtotal Net Operating Profit | 89,221,024 | 66,991,850 | 56,626,646 |  |  |
Operating Expense | (51,039,228) | (45,296,285) | (43,699,389) |  |  |
Share Of Profit Of Equity Accounted Investees | 128,119 | 488,453 | 520,435 |  |  |
Loss On Net Monetary Position | (20,213,528) | (17,927,987) | (9,475,736) |  |  |
Subtotal Profit Before Tax | 18,096,387 | 4,256,031 | 3,971,956 |  |  |
Income Tax Expense | 2,072,167 | 6,670,742 | 1,111,427 | $ 555,002 | $ 647,945 | $ 264,257
PROFIT (LOSS) FOR THE YEAR | 16,024,220 | (2,414,711) | 2,860,529 |  |  |
Profit (Loss) Attributable To owners Of The Bank | 16,027,533 | (2,291,690) | 2,928,692 |  |  |
Profit (Loss) Attributable To Non-controlling Interests | $ (3,313) | $ (123,021) | $ (68,163) |  |  |

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