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RISK MANAGEMENT POLICIES - Maximum credit risk exposure (Details) - ARS ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Maximum Credit Risk Exposure
Maximum credit risk exposure	$ 160,050,689	$ 193,119,999
Promissory Notes [member]
Maximum Credit Risk Exposure
Maximum credit risk exposure	8,514,717	12,142,239
Unsecured corporate loans [member]
Maximum Credit Risk Exposure
Maximum credit risk exposure	11,106,189	11,959,454
Overdrafts [member]
Maximum Credit Risk Exposure
Maximum credit risk exposure	28,794,319	49,154,309
Mortgage loans [member]
Maximum Credit Risk Exposure
Maximum credit risk exposure	7,917,020	8,594,378
Automobile and other secured loans [member]
Maximum Credit Risk Exposure
Maximum credit risk exposure	1,219,936	2,388,308
Retail [member]
Maximum Credit Risk Exposure
Maximum credit risk exposure	27,951,251
Consumer finance [member]
Maximum Credit Risk Exposure
Maximum credit risk exposure	4,565,463
Foreign Trade Loans [member]
Maximum Credit Risk Exposure
Maximum credit risk exposure	18,150,746	21,187,587
Other financings [member]
Maximum Credit Risk Exposure
Maximum credit risk exposure	8,063,007	16,408,051
Other receivables from financial transactions [member]
Maximum Credit Risk Exposure
Maximum credit risk exposure	1,907,043	2,090,749
Receivables from financial leases [member]
Maximum Credit Risk Exposure
Maximum credit risk exposure	3,186,689	5,337,165
Personal loans [member]
Maximum Credit Risk Exposure
Maximum credit risk exposure	38,674,309	30,731,905
Personal loans [member] | Retail [member]
Maximum Credit Risk Exposure
Maximum credit risk exposure	14,312,586	21,890,601
Personal loans [member] | Consumer finance [member]
Maximum Credit Risk Exposure
Maximum credit risk exposure	24,361,723	8,841,304
Credit card loans [member]
Maximum Credit Risk Exposure
Maximum credit risk exposure	32,516,714	33,125,854
Credit card loans [member] | Retail [member]
Maximum Credit Risk Exposure
Maximum credit risk exposure		24,894,355
Credit card loans [member] | Consumer finance [member]
Maximum Credit Risk Exposure
Maximum credit risk exposure		8,231,499
Stage 1 [member] | 12-month ECL [member]
Maximum Credit Risk Exposure
Maximum credit risk exposure	144,376,623	173,978,904
Stage 1 [member] | 12-month ECL [member] | Promissory Notes [member]
Maximum Credit Risk Exposure
Maximum credit risk exposure	8,009,641	11,040,711
Stage 1 [member] | 12-month ECL [member] | Unsecured corporate loans [member]
Maximum Credit Risk Exposure
Maximum credit risk exposure	9,974,477	9,566,109
Stage 1 [member] | 12-month ECL [member] | Overdrafts [member]
Maximum Credit Risk Exposure
Maximum credit risk exposure	27,183,947	46,873,802
Stage 1 [member] | 12-month ECL [member] | Mortgage loans [member]
Maximum Credit Risk Exposure
Maximum credit risk exposure	6,030,357	8,362,500
Stage 1 [member] | 12-month ECL [member] | Automobile and other secured loans [member]
Maximum Credit Risk Exposure
Maximum credit risk exposure	799,642	1,945,197
Stage 1 [member] | 12-month ECL [member] | Retail [member]
Maximum Credit Risk Exposure
Maximum credit risk exposure	26,906,451
Stage 1 [member] | 12-month ECL [member] | Consumer finance [member]
Maximum Credit Risk Exposure
Maximum credit risk exposure	4,152,736
Stage 1 [member] | 12-month ECL [member] | Foreign Trade Loans [member]
Maximum Credit Risk Exposure
Maximum credit risk exposure	16,198,790	18,771,655
Stage 1 [member] | 12-month ECL [member] | Other financings [member]
Maximum Credit Risk Exposure
Maximum credit risk exposure	7,870,468	14,841,096
Stage 1 [member] | 12-month ECL [member] | Other receivables from financial transactions [member]
Maximum Credit Risk Exposure
Maximum credit risk exposure	1,844,597	2,039,403
Stage 1 [member] | 12-month ECL [member] | Receivables from financial leases [member]
Maximum Credit Risk Exposure
Maximum credit risk exposure	2,818,321	4,942,687
Stage 1 [member] | Personal loans [member] | 12-month ECL [member]
Maximum Credit Risk Exposure
Maximum credit risk exposure	32,587,196	24,712,372
Stage 1 [member] | Personal loans [member] | 12-month ECL [member] | Retail [member]
Maximum Credit Risk Exposure
Maximum credit risk exposure	13,070,026	20,024,331
Stage 1 [member] | Personal loans [member] | 12-month ECL [member] | Consumer finance [member]
Maximum Credit Risk Exposure
Maximum credit risk exposure	19,517,170	4,688,041
Stage 1 [member] | Credit card loans [member] | 12-month ECL [member]
Maximum Credit Risk Exposure
Maximum credit risk exposure	31,059,187	30,883,372
Stage 1 [member] | Credit card loans [member] | 12-month ECL [member] | Retail [member]
Maximum Credit Risk Exposure
Maximum credit risk exposure		23,665,677
Stage 1 [member] | Credit card loans [member] | 12-month ECL [member] | Consumer finance [member]
Maximum Credit Risk Exposure
Maximum credit risk exposure		7,217,695
Stage 2 [member] | Lifetime ECL [member]
Maximum Credit Risk Exposure
Maximum credit risk exposure	9,203,046	12,622,590
Stage 2 [member] | Lifetime ECL [member] | Promissory Notes [member]
Maximum Credit Risk Exposure
Maximum credit risk exposure	220,628	728,667
Stage 2 [member] | Lifetime ECL [member] | Unsecured corporate loans [member]
Maximum Credit Risk Exposure
Maximum credit risk exposure	363,545	2,115,731
Stage 2 [member] | Lifetime ECL [member] | Overdrafts [member]
Maximum Credit Risk Exposure
Maximum credit risk exposure	441,780	2,092,931
Stage 2 [member] | Lifetime ECL [member] | Mortgage loans [member]
Maximum Credit Risk Exposure
Maximum credit risk exposure	1,139,227	216,941
Stage 2 [member] | Lifetime ECL [member] | Automobile and other secured loans [member]
Maximum Credit Risk Exposure
Maximum credit risk exposure	260,651	163,433
Stage 2 [member] | Lifetime ECL [member] | Retail [member]
Maximum Credit Risk Exposure
Maximum credit risk exposure	772,705
Stage 2 [member] | Lifetime ECL [member] | Consumer finance [member]
Maximum Credit Risk Exposure
Maximum credit risk exposure	139,163
Stage 2 [member] | Lifetime ECL [member] | Foreign Trade Loans [member]
Maximum Credit Risk Exposure
Maximum credit risk exposure	615,514	854,199
Stage 2 [member] | Lifetime ECL [member] | Other financings [member]
Maximum Credit Risk Exposure
Maximum credit risk exposure	116,204	1,389,182
Stage 2 [member] | Lifetime ECL [member] | Other receivables from financial transactions [member]
Maximum Credit Risk Exposure
Maximum credit risk exposure	16,506	18,592
Stage 2 [member] | Lifetime ECL [member] | Receivables from financial leases [member]
Maximum Credit Risk Exposure
Maximum credit risk exposure	184,319	265,382
Stage 2 [member] | Personal loans [member] | Lifetime ECL [member]
Maximum Credit Risk Exposure
Maximum credit risk exposure	4,932,804	3,388,933
Stage 2 [member] | Personal loans [member] | Lifetime ECL [member] | Retail [member]
Maximum Credit Risk Exposure
Maximum credit risk exposure	807,506	1,359,665
Stage 2 [member] | Personal loans [member] | Lifetime ECL [member] | Consumer finance [member]
Maximum Credit Risk Exposure
Maximum credit risk exposure	4,125,298	2,029,268
Stage 2 [member] | Credit card loans [member] | Lifetime ECL [member]
Maximum Credit Risk Exposure
Maximum credit risk exposure	911,868	1,388,599
Stage 2 [member] | Credit card loans [member] | Lifetime ECL [member] | Retail [member]
Maximum Credit Risk Exposure
Maximum credit risk exposure		897,518
Stage 2 [member] | Credit card loans [member] | Lifetime ECL [member] | Consumer finance [member]
Maximum Credit Risk Exposure
Maximum credit risk exposure		491,081
Stage 3 [member] | Lifetime ECL [member]
Maximum Credit Risk Exposure
Maximum credit risk exposure	6,471,020	6,518,505
Stage 3 [member] | Lifetime ECL [member] | Promissory Notes [member]
Maximum Credit Risk Exposure
Maximum credit risk exposure	284,448	372,861
Stage 3 [member] | Lifetime ECL [member] | Unsecured corporate loans [member]
Maximum Credit Risk Exposure
Maximum credit risk exposure	768,167	277,614
Stage 3 [member] | Lifetime ECL [member] | Overdrafts [member]
Maximum Credit Risk Exposure
Maximum credit risk exposure	1,168,592	187,576
Stage 3 [member] | Lifetime ECL [member] | Mortgage loans [member]
Maximum Credit Risk Exposure
Maximum credit risk exposure	747,436	14,937
Stage 3 [member] | Lifetime ECL [member] | Automobile and other secured loans [member]
Maximum Credit Risk Exposure
Maximum credit risk exposure	159,643	279,678
Stage 3 [member] | Lifetime ECL [member] | Retail [member]
Maximum Credit Risk Exposure
Maximum credit risk exposure	272,095
Stage 3 [member] | Lifetime ECL [member] | Consumer finance [member]
Maximum Credit Risk Exposure
Maximum credit risk exposure	273,564
Stage 3 [member] | Lifetime ECL [member] | Foreign Trade Loans [member]
Maximum Credit Risk Exposure
Maximum credit risk exposure	1,336,442	1,561,733
Stage 3 [member] | Lifetime ECL [member] | Other financings [member]
Maximum Credit Risk Exposure
Maximum credit risk exposure	76,335	177,773
Stage 3 [member] | Lifetime ECL [member] | Other receivables from financial transactions [member]
Maximum Credit Risk Exposure
Maximum credit risk exposure	45,940	32,754
Stage 3 [member] | Lifetime ECL [member] | Receivables from financial leases [member]
Maximum Credit Risk Exposure
Maximum credit risk exposure	184,049	129,096
Stage 3 [member] | Personal loans [member] | Lifetime ECL [member]
Maximum Credit Risk Exposure
Maximum credit risk exposure	1,154,309	2,630,600
Stage 3 [member] | Personal loans [member] | Lifetime ECL [member] | Retail [member]
Maximum Credit Risk Exposure
Maximum credit risk exposure	435,054	506,605
Stage 3 [member] | Personal loans [member] | Lifetime ECL [member] | Consumer finance [member]
Maximum Credit Risk Exposure
Maximum credit risk exposure	719,255	2,123,995
Stage 3 [member] | Credit card loans [member] | Lifetime ECL [member]
Maximum Credit Risk Exposure
Maximum credit risk exposure	$ 545,659	853,883
Stage 3 [member] | Credit card loans [member] | Lifetime ECL [member] | Retail [member]
Maximum Credit Risk Exposure
Maximum credit risk exposure		331,160
Stage 3 [member] | Credit card loans [member] | Lifetime ECL [member] | Consumer finance [member]
Maximum Credit Risk Exposure
Maximum credit risk exposure		$ 522,723

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No definition available.

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The amount that best represents the maximum exposure to credit risk without taking into account any collateral held or other credit enhancements (for example, netting agreements that do not qualify for offset in accordance with IAS 32). [Refer: Credit risk [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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