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RESTRICTIONS IMPOSED ON THE DISTRIBUTION OF DIVIDENDS - Shareholders' equity under the rules of the Argentine Central Bank (Details) - ARS ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
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RESTRICTIONS IMPOSED ON THE DISTRIBUTION OF DIVIDENDS |  |  |  |
Total shareholders' equity under the rules of the Argentine Central Bank | $ 23,435,395 | $ 26,102,395 | $ 31,215,315 | $ 18,538,127
Capital stock [member] |  |  |  |
RESTRICTIONS IMPOSED ON THE DISTRIBUTION OF DIVIDENDS |  |  |  |
Total shareholders' equity under the rules of the Argentine Central Bank | 456,722 | 456,722 | 456,722 | 363,777
Paid-in capital [member] |  |  |  |
RESTRICTIONS IMPOSED ON THE DISTRIBUTION OF DIVIDENDS |  |  |  |
Total shareholders' equity under the rules of the Argentine Central Bank | 24,360,438 | 24,359,953 | 24,360,624 | 10,481,557
Legal reserve [member] |  |  |  |
RESTRICTIONS IMPOSED ON THE DISTRIBUTION OF DIVIDENDS |  |  |  |
Total shareholders' equity under the rules of the Argentine Central Bank | 140,517 | 140,517 | 111,921 | 76,599
Other reserves [member] |  |  |  |
RESTRICTIONS IMPOSED ON THE DISTRIBUTION OF DIVIDENDS |  |  |  |
Total shareholders' equity under the rules of the Argentine Central Bank | 10,320,324 | 8,239,030 | 4,893,538 | $ 3,012,409
Other comprehensive income [member] |  |  |  |
RESTRICTIONS IMPOSED ON THE DISTRIBUTION OF DIVIDENDS |  |  |  |
Total shareholders' equity under the rules of the Argentine Central Bank | 395,630 | $ 443,331 | $ 72,100 |
Argentine Central Bank [member] |  |  |  |
RESTRICTIONS IMPOSED ON THE DISTRIBUTION OF DIVIDENDS |  |  |  |
Total shareholders' equity under the rules of the Argentine Central Bank | 21,680,037 |  |  |
Argentine Central Bank [member] | Capital stock [member] |  |  |  |
RESTRICTIONS IMPOSED ON THE DISTRIBUTION OF DIVIDENDS |  |  |  |
Total shareholders' equity under the rules of the Argentine Central Bank | 456,722 |  |  |
Argentine Central Bank [member] | Paid-in capital [member] |  |  |  |
RESTRICTIONS IMPOSED ON THE DISTRIBUTION OF DIVIDENDS |  |  |  |
Total shareholders' equity under the rules of the Argentine Central Bank | 8,997,297 |  |  |
Argentine Central Bank [member] | Legal reserve [member] |  |  |  |
RESTRICTIONS IMPOSED ON THE DISTRIBUTION OF DIVIDENDS |  |  |  |
Total shareholders' equity under the rules of the Argentine Central Bank | 91,344 |  |  |
Argentine Central Bank [member] | Other reserves [member] |  |  |  |
RESTRICTIONS IMPOSED ON THE DISTRIBUTION OF DIVIDENDS |  |  |  |
Total shareholders' equity under the rules of the Argentine Central Bank | 6,708,810 |  |  |
Argentine Central Bank [member] | Other comprehensive income [member] |  |  |  |
RESTRICTIONS IMPOSED ON THE DISTRIBUTION OF DIVIDENDS |  |  |  |
Total shareholders' equity under the rules of the Argentine Central Bank | 1,167,932 |  |  |
Argentine Central Bank [member] | Net Income [Member] |  |  |  |
RESTRICTIONS IMPOSED ON THE DISTRIBUTION OF DIVIDENDS |  |  |  |
Total shareholders' equity under the rules of the Argentine Central Bank | $ 4,257,932 |  |  |

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