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FAIR VALUES - Assets and Liabilities at Amortized Cost (Details) - ARS ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Fair value measurement
Financial liabilities at amortised cost	$ 6,086,475	$ 14,317,445
Carrying value [member]
Financial Assets
Financial assets at amortised cost	119,075,084	179,817,414
Fair value measurement
Financial liabilities at amortised cost	109,670,781	176,867,893
Carrying value [member] | Deposits [member]
Fair value measurement
Financial liabilities at amortised cost	89,008,177	145,996,201
Carrying value [member] | Repo transactions
Fair value measurement
Financial liabilities at amortised cost	319,817
Carrying value [member] | Other financial liabilities
Fair value measurement
Financial liabilities at amortised cost	3,118,827	2,091,405
Carrying value [member] | Financing received from the Argentine Central Bank and other financial institutions
Fair value measurement
Financial liabilities at amortised cost	9,017,597	12,334,083
Carrying value [member] | Unsubordinated Negotiable Obligations
Fair value measurement
Financial liabilities at amortised cost	6,086,475	14,317,445
Carrying value [member] | Subordinated negotiable obligations [member]
Fair value measurement
Financial liabilities at amortised cost	2,119,888	2,128,759
Carrying value [member] | Cash and due from banks
Financial Assets
Financial assets at amortised cost	26,373,189	51,806,375
Carrying value [member] | Other financial assets
Financial Assets
Financial assets at amortised cost	995,335	2,588,976
Carrying value [member] | Loans and other financing [member]
Financial Assets
Financial assets at amortised cost	88,010,011	118,771,635
Carrying value [member] | Other debt securities
Financial Assets
Financial assets at amortised cost	3,287,385	6,458,727
Carrying value [member] | Financial assets in guarantee
Financial Assets
Financial assets at amortised cost	409,164	191,701
At fair value [member]
Financial Assets
Financial assets at amortised cost	122,785,359	199,583,014
Fair value measurement
Financial liabilities at amortised cost	109,736,734	172,197,562
At fair value [member] | Level 1 of fair value hierarchy [member]
Financial Assets
Financial assets at amortised cost	31,147,859	61,053,722
Fair value measurement
Financial liabilities at amortised cost	11,948,838	16,487,086
At fair value [member] | Level 3 of fair value hierarchy [member]
Financial Assets
Financial assets at amortised cost	91,637,500	138,529,292
Fair value measurement
Financial liabilities at amortised cost	97,787,896	155,710,476
At fair value [member] | Deposits [member]
Fair value measurement
Financial liabilities at amortised cost	89,009,817	145,629,417
At fair value [member] | Deposits [member] | Level 3 of fair value hierarchy [member]
Fair value measurement
Financial liabilities at amortised cost	89,009,817	145,629,417
At fair value [member] | Repo transactions
Fair value measurement
Financial liabilities at amortised cost	319,817
At fair value [member] | Repo transactions | Level 1 of fair value hierarchy [member]
Fair value measurement
Financial liabilities at amortised cost	319,817
At fair value [member] | Other financial liabilities
Fair value measurement
Financial liabilities at amortised cost	3,174,432	2,091,405
At fair value [member] | Other financial liabilities | Level 1 of fair value hierarchy [member]
Fair value measurement
Financial liabilities at amortised cost	3,174,432	2,091,405
At fair value [member] | Financing received from the Argentine Central Bank and other financial institutions
Fair value measurement
Financial liabilities at amortised cost	8,778,079	10,134,114
At fair value [member] | Financing received from the Argentine Central Bank and other financial institutions | Level 1 of fair value hierarchy [member]
Fair value measurement
Financial liabilities at amortised cost		53,055
At fair value [member] | Financing received from the Argentine Central Bank and other financial institutions | Level 3 of fair value hierarchy [member]
Fair value measurement
Financial liabilities at amortised cost	8,778,079	10,081,059
At fair value [member] | Unsubordinated Negotiable Obligations
Fair value measurement
Financial liabilities at amortised cost	6,086,475	12,232,833
At fair value [member] | Unsubordinated Negotiable Obligations | Level 1 of fair value hierarchy [member]
Fair value measurement
Financial liabilities at amortised cost	6,086,475	12,232,833
At fair value [member] | Subordinated negotiable obligations [member]
Fair value measurement
Financial liabilities at amortised cost	2,368,114	2,109,793
At fair value [member] | Subordinated negotiable obligations [member] | Level 1 of fair value hierarchy [member]
Fair value measurement
Financial liabilities at amortised cost	2,368,114	2,109,793
At fair value [member] | Cash and due from banks
Financial Assets
Financial assets at amortised cost	26,373,189	51,806,375
At fair value [member] | Cash and due from banks | Level 1 of fair value hierarchy [member]
Financial Assets
Financial assets at amortised cost	26,373,189	51,806,375
At fair value [member] | Other financial assets
Financial Assets
Financial assets at amortised cost	995,335	2,588,976
At fair value [member] | Other financial assets | Level 1 of fair value hierarchy [member]
Financial Assets
Financial assets at amortised cost	995,335	2,588,976
At fair value [member] | Loans and other financing [member]
Financial Assets
Financial assets at amortised cost	91,637,500	138,529,292
At fair value [member] | Loans and other financing [member] | Level 3 of fair value hierarchy [member]
Financial Assets
Financial assets at amortised cost	91,637,500	138,529,292
At fair value [member] | Other debt securities
Financial Assets
Financial assets at amortised cost	3,370,171	6,466,670
At fair value [member] | Other debt securities | Level 1 of fair value hierarchy [member]
Financial Assets
Financial assets at amortised cost	3,370,171	6,466,670
At fair value [member] | Financial assets in guarantee
Financial Assets
Financial assets at amortised cost	409,164	191,701
At fair value [member] | Financial assets in guarantee | Level 1 of fair value hierarchy [member]
Financial Assets
Financial assets at amortised cost	$ 409,164	$ 191,701

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The amount of financial assets at amortised cost. The amortised cost is the amount at which financial assets are measured at initial recognition minus principal repayments, plus or minus the cumulative amortisation using the effective interest method of any difference between that initial amount and the maturity amount, and adjusted for any impairment. [Refer: Financial assets]

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The amount of financial liabilities at amortised cost. The amortised cost is the amount at which financial liabilities are measured at initial recognition minus principal repayments, plus or minus the cumulative amortisation using the effective interest method of any difference between that initial amount and the maturity amount. [Refer: Financial liabilities]

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