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Income Tax - Reconciliation of Effective Tax Rate (Details) - ARS ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Reconciliation of average effective tax rate and applicable tax rate [abstract]            
Profit before income tax $ 18,102,889 $ 24,636,513 $ 5,794,181      
Income tax rate 30.00% 30.00% 30.00%      
Income tax using the Bank's income tax rate $ 5,430,867 $ 7,390,954 $ 1,738,254      
Permanent Differences [Abstract]            
Tax -exempt income (328,390) (655,330) (411,218)      
Non-deductible expenses 120,650 87,334 146,568      
Change in tax rate (444,727) (1,281,548) (604,046)      
Other 194,985 (21,293) (36,906)      
Net monetary inflation adjustment 8,755,629 10,490,151 11,210,387      
Sub total 13,729,014 16,010,268 12,043,039      
Inflation adjustment for tax purposes (5,367,113) (13,189,209) (2,961,457)      
Adjustments for current tax of prior periods (327,807)          
Income tax expense $ 8,034,094 $ 2,821,059 $ 9,081,582 $ 555,002 $ 647,945 $ 264,257
Effective tax rate 44.00% 11.00% 157.00%