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Financial instruments risks - Summary of Additional Information on the Credit Quality of Assets (Details) - ARS ($)
$ in Thousands
Dec. 31, 2025
Dec. 31, 2024
Disclosure of credit risk exposure [line items]    
Financial assets at amortised cost $ 15,758,769,628 $ 10,894,034,083
Financial assets 28,583,333,619 20,193,284,959
Debt securities 3,084,239,647 3,238,293,701
Total loan commitments and financial guarantees 5,695,811,923 4,566,758,893
Total credit risk exposure 28,583,333,619 20,193,284,959
Wholesale    
Disclosure of credit risk exposure [line items]    
Exposure to credit risk on loan commitments and financial guarantee contracts 1,683,682,032 848,244,736
Wholesale Business    
Disclosure of credit risk exposure [line items]    
Exposure to credit risk on loan commitments and financial guarantee contracts 621,837,343 166,309,912
Wholesale Corporate and Investment Banking    
Disclosure of credit risk exposure [line items]    
Financial assets 206,378,096 213,972,339
Wholesale International and Institutional    
Disclosure of credit risk exposure [line items]    
Exposure to credit risk on loan commitments and financial guarantee contracts 55,799,607 160,667,797
Wholesale MSMEs    
Disclosure of credit risk exposure [line items]    
Exposure to credit risk on loan commitments and financial guarantee contracts 799,666,986 307,294,688
Retail    
Disclosure of credit risk exposure [line items]    
Exposure to credit risk on loan commitments and financial guarantee contracts 4,012,129,891 3,718,514,157
Retail Advances    
Disclosure of credit risk exposure [line items]    
Exposure to credit risk on loan commitments and financial guarantee contracts 21,153,410 19,505,505
Retail Credit Cards    
Disclosure of credit risk exposure [line items]    
Exposure to credit risk on loan commitments and financial guarantee contracts 3,985,933,889 3,692,994,531
Real estate mortgage    
Disclosure of credit risk exposure [line items]    
Exposure to credit risk on loan commitments and financial guarantee contracts 5,006,620 5,106,104
Receivables from financial leases    
Disclosure of credit risk exposure [line items]    
Exposure to credit risk on loan commitments and financial guarantee contracts   908,017
Financial assets 35,972  
Cash and cash equivalents    
Disclosure of credit risk exposure [line items]    
Exposure to credit risk on loan commitments and financial guarantee contracts 3,423,939,785 1,370,888,970
Financial assets at amortized cost    
Disclosure of credit risk exposure [line items]    
Financial assets at amortised cost 16,379,342,264 11,017,343,395
Financial assets at amortized cost | Wholesale    
Disclosure of credit risk exposure [line items]    
Financial assets 10,099,369,799 6,865,239,837
Financial assets at amortized cost | Wholesale Business    
Disclosure of credit risk exposure [line items]    
Financial assets 3,819,807,251 2,208,459,399
Financial assets at amortized cost | Wholesale Corporate and Investment Banking    
Disclosure of credit risk exposure [line items]    
Financial assets 3,247,543,529 2,270,773,592
Financial assets at amortized cost | Wholesale International and Institutional    
Disclosure of credit risk exposure [line items]    
Financial assets 554,859,517 497,493,720
Financial assets at amortized cost | Wholesale MSMEs    
Disclosure of credit risk exposure [line items]    
Financial assets 1,776,584,054 1,209,424,341
Financial assets at amortized cost | Wholesale Others    
Disclosure of credit risk exposure [line items]    
Financial assets 700,575,448 679,088,785
Financial assets at amortized cost | Retail    
Disclosure of credit risk exposure [line items]    
Financial assets 5,695,994,309 3,941,752,560
Financial assets at amortized cost | Retail Advances    
Disclosure of credit risk exposure [line items]    
Financial assets 6,863,794 4,182,618
Financial assets at amortized cost | Retail Credit Cards    
Disclosure of credit risk exposure [line items]    
Financial assets 3,012,525,743 2,390,121,502
Financial assets at amortized cost | Retail Personal Loans    
Disclosure of credit risk exposure [line items]    
Financial assets 1,224,546,071 858,382,014
Financial assets at amortized cost | Retail Bridge Loans    
Disclosure of credit risk exposure [line items]    
Financial assets 694,074,452 324,708,010
Financial assets at amortized cost | Real estate mortgage    
Disclosure of credit risk exposure [line items]    
Financial assets 723,587,572 356,644,536
Financial assets at amortized cost | Receivables from financial leases    
Disclosure of credit risk exposure [line items]    
Financial assets 4,970,230 5,608,471
Financial assets at amortized cost | Other financial assets    
Disclosure of credit risk exposure [line items]    
Financial assets 29,426,447 2,105,409
Financial assets at amortized cost | Debt securities    
Disclosure of credit risk exposure [line items]    
Financial assets 583,978,156 210,350,998
Financial assets at fair value through other comprehensive income    
Disclosure of credit risk exposure [line items]    
Debt securities 3,084,239,647 3,238,293,701
Total financial assets risk 22,887,521,696 15,626,526,066
Financial assets at fair value through other comprehensive income | Debt securities    
Disclosure of credit risk exposure [line items]    
Debt securities 3,084,239,647 3,238,293,701
Stage 1    
Disclosure of credit risk exposure [line items]    
Financial assets 26,389,844,526 15,934,783,088
Total loan commitments and financial guarantees 5,353,690,345 4,355,374,326
Total credit risk exposure 26,389,844,526 15,934,783,088
Stage 1 | Wholesale    
Disclosure of credit risk exposure [line items]    
Exposure to credit risk on loan commitments and financial guarantee contracts 1,520,945,514 796,726,607
Stage 1 | Wholesale Business    
Disclosure of credit risk exposure [line items]    
Exposure to credit risk on loan commitments and financial guarantee contracts 572,702,520 152,061,782
Stage 1 | Wholesale Corporate and Investment Banking    
Disclosure of credit risk exposure [line items]    
Financial assets 171,747,222 201,230,923
Stage 1 | Wholesale International and Institutional    
Disclosure of credit risk exposure [line items]    
Exposure to credit risk on loan commitments and financial guarantee contracts 54,613,827 159,500,964
Stage 1 | Wholesale MSMEs    
Disclosure of credit risk exposure [line items]    
Exposure to credit risk on loan commitments and financial guarantee contracts 721,881,945 283,932,938
Stage 1 | Retail    
Disclosure of credit risk exposure [line items]    
Exposure to credit risk on loan commitments and financial guarantee contracts 3,832,744,831 3,558,647,719
Stage 1 | Retail Advances    
Disclosure of credit risk exposure [line items]    
Exposure to credit risk on loan commitments and financial guarantee contracts 20,064,662 18,853,816
Stage 1 | Retail Credit Cards    
Disclosure of credit risk exposure [line items]    
Exposure to credit risk on loan commitments and financial guarantee contracts 3,808,755,235 3,535,716,868
Stage 1 | Real estate mortgage    
Disclosure of credit risk exposure [line items]    
Exposure to credit risk on loan commitments and financial guarantee contracts 3,888,962 3,177,409
Stage 1 | Receivables from financial leases    
Disclosure of credit risk exposure [line items]    
Exposure to credit risk on loan commitments and financial guarantee contracts   899,626
Financial assets 35,972  
Stage 1 | Cash and cash equivalents    
Disclosure of credit risk exposure [line items]    
Exposure to credit risk on loan commitments and financial guarantee contracts 3,423,939,785 1,370,888,970
Stage 1 | Financial assets at amortized cost    
Disclosure of credit risk exposure [line items]    
Financial assets at amortised cost 14,527,974,749 10,110,314,251
Stage 1 | Financial assets at amortized cost | Wholesale    
Disclosure of credit risk exposure [line items]    
Financial assets 9,510,834,035 6,649,587,281
Stage 1 | Financial assets at amortized cost | Wholesale Business    
Disclosure of credit risk exposure [line items]    
Financial assets 3,594,108,500 2,140,653,711
Stage 1 | Financial assets at amortized cost | Wholesale Corporate and Investment Banking    
Disclosure of credit risk exposure [line items]    
Financial assets 3,177,238,378 2,205,478,999
Stage 1 | Financial assets at amortized cost | Wholesale International and Institutional    
Disclosure of credit risk exposure [line items]    
Financial assets 554,792,216 493,570,415
Stage 1 | Financial assets at amortized cost | Wholesale MSMEs    
Disclosure of credit risk exposure [line items]    
Financial assets 1,484,119,493 1,130,795,371
Stage 1 | Financial assets at amortized cost | Wholesale Others    
Disclosure of credit risk exposure [line items]    
Financial assets 700,575,448 679,088,785
Stage 1 | Financial assets at amortized cost | Retail    
Disclosure of credit risk exposure [line items]    
Financial assets 4,433,162,558 3,460,726,970
Stage 1 | Financial assets at amortized cost | Retail Advances    
Disclosure of credit risk exposure [line items]    
Financial assets 1,244,185 1,318,251
Stage 1 | Financial assets at amortized cost | Retail Credit Cards    
Disclosure of credit risk exposure [line items]    
Financial assets 2,425,608,477 2,148,914,478
Stage 1 | Financial assets at amortized cost | Retail Personal Loans    
Disclosure of credit risk exposure [line items]    
Financial assets 691,032,737 736,081,258
Stage 1 | Financial assets at amortized cost | Retail Bridge Loans    
Disclosure of credit risk exposure [line items]    
Financial assets 618,807,281 313,982,783
Stage 1 | Financial assets at amortized cost | Real estate mortgage    
Disclosure of credit risk exposure [line items]    
Financial assets 664,377,468 254,440,611
Stage 1 | Financial assets at amortized cost | Receivables from financial leases    
Disclosure of credit risk exposure [line items]    
Financial assets 2,759,478 3,884,180
Stage 1 | Financial assets at amortized cost | Other financial assets    
Disclosure of credit risk exposure [line items]    
Financial assets 29,332,932 2,105,409
Stage 1 | Financial assets at amortized cost | Debt securities    
Disclosure of credit risk exposure [line items]    
Financial assets 583,978,156  
Stage 1 | Financial assets at fair value through other comprehensive income    
Disclosure of credit risk exposure [line items]    
Debt securities 3,084,239,647 98,205,541
Total financial assets risk 21,036,154,181 11,579,408,762
Stage 1 | Financial assets at fair value through other comprehensive income | Debt securities    
Disclosure of credit risk exposure [line items]    
Debt securities 3,084,239,647 98,205,541
Stage 2    
Disclosure of credit risk exposure [line items]    
Financial assets 1,446,028,615 4,108,842,406
Total loan commitments and financial guarantees 340,349,622 210,135,405
Total credit risk exposure 1,446,028,615 4,108,842,406
Stage 2 | Wholesale    
Disclosure of credit risk exposure [line items]    
Exposure to credit risk on loan commitments and financial guarantee contracts 162,073,845 51,343,556
Stage 2 | Wholesale Business    
Disclosure of credit risk exposure [line items]    
Exposure to credit risk on loan commitments and financial guarantee contracts 48,945,048 14,236,317
Stage 2 | Wholesale Corporate and Investment Banking    
Disclosure of credit risk exposure [line items]    
Financial assets 34,630,867 12,741,407
Stage 2 | Wholesale International and Institutional    
Disclosure of credit risk exposure [line items]    
Exposure to credit risk on loan commitments and financial guarantee contracts 1,185,780 1,166,833
Stage 2 | Wholesale MSMEs    
Disclosure of credit risk exposure [line items]    
Exposure to credit risk on loan commitments and financial guarantee contracts 77,312,150 23,198,999
Stage 2 | Retail    
Disclosure of credit risk exposure [line items]    
Exposure to credit risk on loan commitments and financial guarantee contracts 178,275,777 158,791,849
Stage 2 | Retail Advances    
Disclosure of credit risk exposure [line items]    
Exposure to credit risk on loan commitments and financial guarantee contracts 1,084,160 647,748
Stage 2 | Retail Credit Cards    
Disclosure of credit risk exposure [line items]    
Exposure to credit risk on loan commitments and financial guarantee contracts 176,154,853 156,380,250
Stage 2 | Real estate mortgage    
Disclosure of credit risk exposure [line items]    
Exposure to credit risk on loan commitments and financial guarantee contracts 1,036,764 1,755,503
Stage 2 | Receivables from financial leases    
Disclosure of credit risk exposure [line items]    
Exposure to credit risk on loan commitments and financial guarantee contracts   8,348
Stage 2 | Financial assets at amortized cost    
Disclosure of credit risk exposure [line items]    
Financial assets at amortised cost 1,105,678,993 758,618,841
Stage 2 | Financial assets at amortized cost | Wholesale    
Disclosure of credit risk exposure [line items]    
Financial assets 433,855,591 195,429,532
Stage 2 | Financial assets at amortized cost | Wholesale Business    
Disclosure of credit risk exposure [line items]    
Financial assets 174,391,926 61,260,474
Stage 2 | Financial assets at amortized cost | Wholesale Corporate and Investment Banking    
Disclosure of credit risk exposure [line items]    
Financial assets 70,301,493 65,293,997
Stage 2 | Financial assets at amortized cost | Wholesale International and Institutional    
Disclosure of credit risk exposure [line items]    
Financial assets 247 3,894,438
Stage 2 | Financial assets at amortized cost | Wholesale MSMEs    
Disclosure of credit risk exposure [line items]    
Financial assets 189,161,925 64,980,623
Stage 2 | Financial assets at amortized cost | Retail    
Disclosure of credit risk exposure [line items]    
Financial assets 671,823,402 352,838,311
Stage 2 | Financial assets at amortized cost | Retail Advances    
Disclosure of credit risk exposure [line items]    
Financial assets 787,460 547,236
Stage 2 | Financial assets at amortized cost | Retail Credit Cards    
Disclosure of credit risk exposure [line items]    
Financial assets 299,797,752 178,415,808
Stage 2 | Financial assets at amortized cost | Retail Personal Loans    
Disclosure of credit risk exposure [line items]    
Financial assets 274,040,192 73,158,581
Stage 2 | Financial assets at amortized cost | Retail Bridge Loans    
Disclosure of credit risk exposure [line items]    
Financial assets 46,984,566 7,385,190
Stage 2 | Financial assets at amortized cost | Real estate mortgage    
Disclosure of credit risk exposure [line items]    
Financial assets 49,219,829 91,801,813
Stage 2 | Financial assets at amortized cost | Receivables from financial leases    
Disclosure of credit risk exposure [line items]    
Financial assets 900,088 1,529,683
Stage 2 | Financial assets at amortized cost | Other financial assets    
Disclosure of credit risk exposure [line items]    
Financial assets 93,515  
Stage 2 | Financial assets at amortized cost | Debt securities    
Disclosure of credit risk exposure [line items]    
Financial assets   210,350,998
Stage 2 | Financial assets at fair value through other comprehensive income    
Disclosure of credit risk exposure [line items]    
Debt securities   3,140,088,160
Total financial assets risk 1,105,678,993 3,898,707,001
Stage 2 | Financial assets at fair value through other comprehensive income | Debt securities    
Disclosure of credit risk exposure [line items]    
Debt securities   3,140,088,160
Stage 3    
Disclosure of credit risk exposure [line items]    
Financial assets 747,460,478 149,659,465
Total loan commitments and financial guarantees 1,771,956 1,249,162
Total credit risk exposure 747,460,478 149,659,465
Stage 3 | Wholesale    
Disclosure of credit risk exposure [line items]    
Exposure to credit risk on loan commitments and financial guarantee contracts 662,673 174,573
Stage 3 | Wholesale Business    
Disclosure of credit risk exposure [line items]    
Exposure to credit risk on loan commitments and financial guarantee contracts 189,775 11,813
Stage 3 | Wholesale Corporate and Investment Banking    
Disclosure of credit risk exposure [line items]    
Financial assets 7 9
Stage 3 | Wholesale MSMEs    
Disclosure of credit risk exposure [line items]    
Exposure to credit risk on loan commitments and financial guarantee contracts 472,891 162,751
Stage 3 | Retail    
Disclosure of credit risk exposure [line items]    
Exposure to credit risk on loan commitments and financial guarantee contracts 1,109,283 1,074,589
Stage 3 | Retail Advances    
Disclosure of credit risk exposure [line items]    
Exposure to credit risk on loan commitments and financial guarantee contracts 4,588 3,941
Stage 3 | Retail Credit Cards    
Disclosure of credit risk exposure [line items]    
Exposure to credit risk on loan commitments and financial guarantee contracts 1,023,801 897,413
Stage 3 | Real estate mortgage    
Disclosure of credit risk exposure [line items]    
Exposure to credit risk on loan commitments and financial guarantee contracts 80,894 173,192
Stage 3 | Receivables from financial leases    
Disclosure of credit risk exposure [line items]    
Exposure to credit risk on loan commitments and financial guarantee contracts   43
Stage 3 | Financial assets at amortized cost    
Disclosure of credit risk exposure [line items]    
Financial assets at amortised cost 745,688,522 148,410,303
Stage 3 | Financial assets at amortized cost | Wholesale    
Disclosure of credit risk exposure [line items]    
Financial assets 154,680,173 20,223,024
Stage 3 | Financial assets at amortized cost | Wholesale Business    
Disclosure of credit risk exposure [line items]    
Financial assets 51,306,825 6,545,214
Stage 3 | Financial assets at amortized cost | Wholesale Corporate and Investment Banking    
Disclosure of credit risk exposure [line items]    
Financial assets 3,658 596
Stage 3 | Financial assets at amortized cost | Wholesale International and Institutional    
Disclosure of credit risk exposure [line items]    
Financial assets 67,054 28,867
Stage 3 | Financial assets at amortized cost | Wholesale MSMEs    
Disclosure of credit risk exposure [line items]    
Financial assets 103,302,636 13,648,347
Stage 3 | Financial assets at amortized cost | Retail    
Disclosure of credit risk exposure [line items]    
Financial assets 591,008,349 128,187,279
Stage 3 | Financial assets at amortized cost | Retail Advances    
Disclosure of credit risk exposure [line items]    
Financial assets 4,832,149 2,317,131
Stage 3 | Financial assets at amortized cost | Retail Credit Cards    
Disclosure of credit risk exposure [line items]    
Financial assets 287,119,514 62,791,216
Stage 3 | Financial assets at amortized cost | Retail Personal Loans    
Disclosure of credit risk exposure [line items]    
Financial assets 259,473,142 49,142,175
Stage 3 | Financial assets at amortized cost | Retail Bridge Loans    
Disclosure of credit risk exposure [line items]    
Financial assets 28,282,605 3,340,037
Stage 3 | Financial assets at amortized cost | Real estate mortgage    
Disclosure of credit risk exposure [line items]    
Financial assets 9,990,275 10,402,112
Stage 3 | Financial assets at amortized cost | Receivables from financial leases    
Disclosure of credit risk exposure [line items]    
Financial assets 1,310,664 194,608
Stage 3 | Financial assets at fair value through other comprehensive income    
Disclosure of credit risk exposure [line items]    
Total financial assets risk $ 745,688,522 $ 148,410,303