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Interest Income - Summary of Interest Income (Detail) - ARS ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Interest and adjustment for the application of the effective interest rate of financial assets measured at amortized cost      
For cash and bank deposits $ 128,169 $ 354,796 $ 58,114
For government securities 6,429,385 9,805,996 1,824,372
For debt securities 1,607,980 1,942,811 473,775
For loans and other financing      
Non financial public sector 2,953,253 1,840,235 2,285,366
Financial sector 1,012,071 2,821,732 2,991,408
Non financial private sector      
Overdrafts 10,812,954 21,176,144 13,705,709
Documents 4,758,585 7,594,077 8,394,619
Mortgage loans 8,074,017 11,031,618 10,454,451
Pledge loans 476,023 855,499 1,503,884
Personal loans 32,690,320 40,829,605 52,942,020
Credit cards 11,510,688 17,978,756 17,776,669
Leases 57,036 247,431 413,127
Other 13,213,833 7,164,630 9,160,791
For repo transactions      
Central Bank of Argentina 6,971,713 552,927 67,162
Other financial institutions 95,676 3,919,284 874,980
Subtotal Interest and adjustment for the application of the effective interest rate of financial assets measured at amortized cost 100,791,703 128,115,541 122,926,447
Interest and adjustment for the application of the effective interest rate of financial assets measured at fair value through other comprehensive income      
Debt government Securities 56,288,509 78,228,180 40,733,953
Subtotal Interest and adjustment for the application of the effective interest rate of financial assets measured at fair value through other comprehensive income 56,288,509 78,228,180 40,733,953
Total $ 157,080,212 $ 206,343,721 $ 163,660,400