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Fair Values Of Financial Instruments - Assets And Liabilities Not Measured At Fair Value (Details) - ARS ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
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Financial Assets Abstract |  |  |  |
CASH AND CASH EQUIVALENTS | $ 152,040,070 | $ 212,733,025 | $ 207,554,779 | $ 118,229,933
Other Financial Assets | 20,841,365 | 14,835,962 |  |
Reverse Repurchase Agreements | 48,686,967 |  |  |
Financial Liabilities Abstract |  |  |  |
Other Financial Liabilities | 39,226,721 | 39,242,734 |  |
Bank Loans | 9,626,028 | 8,371,111 |  |
Debt Securities Issued | 1,168,782 | 9,964,233 |  |
Book value Member |  |  |  |
Financial Assets Abstract |  |  |  |
CASH AND CASH EQUIVALENTS | 152,040,070 | 212,733,025 |  |
Other Financial Assets | 20,841,365 | 14,835,962 |  |
Loans And Advances Not Measured at Fair Value | 279,585,511 | 265,650,592 |  |
Reverse Repurchase Agreements | 48,686,967 |  |  |
Financial Liabilities Abstract |  |  |  |
Deposits | 478,223,264 | 400,236,797 |  |
Other Financial Liabilities | 39,226,721 | 39,242,734 |  |
Bank Loans | 9,626,028 | 8,371,111 |  |
Debt Securities Issued | 1,168,782 | 9,964,233 |  |
Total Fair Value Member |  |  |  |
Financial Assets Abstract |  |  |  |
Loans And Advances Not Measured at Fair Value | 276,440,067 | 262,969,717 |  |
Financial Liabilities Abstract |  |  |  |
Deposits | 473,797,890 | 397,728,689 |  |
Bank Loans | 9,870,481 | 8,326,413 |  |
Debt Securities Issued | 1,137,658 | 9,889,946 |  |
Level 2 - Fair Value Member |  |  |  |
Financial Assets Abstract |  |  |  |
CASH AND CASH EQUIVALENTS | 0 |  |  |
Other Financial Assets | 0 |  |  |
Loans And Advances Not Measured at Fair Value | 0 | 262,969,717 |  |
Reverse Repurchase Agreements | 0 |  |  |
Financial Liabilities Abstract |  |  |  |
Deposits | 1,677,826 | 397,728,689 |  |
Other Financial Liabilities | 0 |  |  |
Bank Loans | 4,813,284 | 8,326,413 |  |
Debt Securities Issued | 1,137,658 | $ 9,889,946 |  |
Level 3 - Fair Value Member |  |  |  |
Financial Assets Abstract |  |  |  |
CASH AND CASH EQUIVALENTS | 0 |  |  |
Other Financial Assets | 0 |  |  |
Loans And Advances Not Measured at Fair Value | 276,440,067 |  |  |
Reverse Repurchase Agreements | 0 |  |  |
Financial Liabilities Abstract |  |  |  |
Deposits | 472,120,064 |  |  |
Other Financial Liabilities | 0 |  |  |
Bank Loans | $ 5,057,197 |  |  |

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