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Income Tax - Reconciliation of Effective Tax Rate (Details) - ARS ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Reconciliation of average effective tax rate and applicable tax rate [abstract]            
Profit before income tax $ 13,977,273 $ 27,324,790 $ 37,186,765      
Income tax rate 35.00% 30.00% 30.00%      
Income tax using the Bank's income tax rate $ 4,892,046 $ 8,197,437 $ 11,156,030      
Permanent Differences [Abstract]            
Tax -exempt income (284,301) (495,677) (989,166)      
Non-deductible expenses 145,946 182,111 131,823      
Change in tax rate 1,476,570 (671,278) (1,934,389)      
Other 64,298 294,314 (32,143)      
Net monetary inflation adjustment 19,796,244 12,691,263 15,834,002      
Sub total 26,090,803 20,198,170 24,166,157      
Inflation adjustment for tax purposes (20,467,605) (7,576,583) (19,908,003)      
Over/under income tax from prior year [1] (1,001,615) (494,797)        
Income tax expense $ 4,621,583 $ 12,126,790 $ 4,258,154 $ 555,002 $ 647,945 $ 264,257
Effective tax rate 33.00% 44.00% 11.00%      
[1] It includes an income tax charge of 974,000 corresponding to the tax inflation mechanism applied for fiscal year 2020 – see note 15.5 “Income tax – inflation adjustment for fiscal year 2020”.