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Note 6 - Risk Management - Hedging Intruments Affected By IBOR (Details) - Group [Member]
Jun. 30, 2020
Operations And Amounts LineItems  
Total Moratoriums And Guarantees 50,049,513,228
Credit Investment 11.90%
Existing Moratoriums [Member]  
Operations And Amounts LineItems  
Moratorium 29,668,411,180
Ended Moratoriums [Member]  
Operations And Amounts LineItems  
Moratorium 6,590,198,784
Total  
Operations And Amounts LineItems  
Moratorium 36,258,609,964
Public Guarantee 13,790,903,264
Number Of Clients [Member]  
Operations And Amounts LineItems  
Moratorium 3,138,894
Public Guarantee 196,186