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Income Tax - Reconciliation of Effective Tax Rate (Details) - ARS ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Reconciliation of average effective tax rate and applicable tax rate [abstract]            
Profit before income tax $ 18,096,387 $ 4,256,031 $ 3,971,956      
Income tax rate 30.00% 30.00% 35.00%      
Income tax using the Bank's income tax rate $ 5,428,916 $ 1,276,809 $ 1,390,185      
Permanent Differences [Abstract]            
Tax -exempt income (481,363) (302,054) (397,886)      
Non-deductible expenses 64,150 107,659 55,237      
Change in tax rate (941,342) (443,693) (1,357,294)      
Other (15,641) (27,109) (42,209)      
Net monetary inflation adjustment 7,705,386 8,234,425 4,629,817      
Sub total 11,760,106 8,846,037 4,277,850      
Inflation adjustment (9,687,939) (2,175,295) (3,166,423)      
Income tax expense $ 2,072,167 $ 6,670,742 $ 1,111,427 $ 555,002 $ 647,945 $ 264,257
Effective tax rate 11.00% 157.00% 28.00%