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Interest and similar income and expense and net gain (loss) on investment securities and derivatives (Tables) | 12 Months Ended
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Dec. 31, 2019
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Summary of Interest, Similar Income of Financial Assets at Amortized Cost and at Fair Value Through Other Comprehensive Income | a) Interest and similar income of financial assets at amortized cost and at fair value through other comprehensive income
|  | 01/01 to 12/31/2019 |  |  | 01/01 to 12/31/2018 |  |  | 01/01 to 12/31/2017 |
Central Bank compulsory deposits |  |  | 4,734 |  |  |  | 5,063 |  |  |  | 7,201 |
Interbank deposits |  |  | 1,173 |  |  |  | 1,080 |  |  |  | 744 |
Securities purchased under agreements to resell |  |  | 16,197 |  |  |  | 17,365 |  |  |  | 25,711 |
Financial assets at fair value through other comprehensive income |  |  | 10,758 |  |  |  | 9,194 |  |  |  | 8,886 |
Financial assets at amortized cost |  |  | 2,582 |  |  |  | 2,614 |  |  |  | 3,017 |
Loans |  |  | 81,046 |  |  |  | 73,640 |  |  |  | 75,568 |
Other financial assets |  |  | 1,033 |  |  |  | 1,368 |  |  |  | 1,576 |
Total |  |  | 117,523 |  |  |  | 110,324 |  |  |  | 122,703 |
Summary of Interest and Similar Expense | b) Interest and similar expense
|  | 01/01 to 12/31/2019 |  |  | 01/01 to 12/31/2018 |  |  | 01/01 to 12/31/2017 |
Deposits |  |  | (18,559 | ) |  |  | (17,484 | ) |  |  | (13,340 | )
Securities sold under repurchase agreements |  |  | (20,473 | ) |  |  | (20,889 | ) |  |  | (33,087 | )
Interbank market funds |  |  | (13,231 | ) |  |  | (13,587 | ) |  |  | (10,059 | )
Institutional market funds |  |  | (6,837 | ) |  |  | (6,773 | ) |  |  | (6,852 | )
Financial expense from technical provisions for insurance and private pension plans |  |  | (16,720 | ) |  |  | (11,815 | ) |  |  | (14,918 | )
Other |  |  | (138 | ) |  |  | (64 | ) |  |  | (74 | )
Total |  |  | (75,958 | ) |  |  | (70,612 | ) |  |  | (78,330 | )
Schedule of Adjustments to Fair Value of Financial Assets and Liabilities | c) Adjustment to Fair Value of Financial Assets and Liabilities
|  | 01/01 to 12/31/2019 |  |  | 01/01 to 12/31/2018 |  |  | 01/01 to 12/31/2017 |
Financial assets at fair value through profit or loss |  |  | 3,628 |  |  |  | (4,110 | ) |  |  | 2,138 |
Derivatives (*) |  |  | (70 | ) |  |  | (260 | ) |  |  | 2,028 |
Financial assets designated at fair value through profit or loss |  |  | (64 | ) |  |  | (218 | ) |  |  | 180 |
Financial assets at fair value through other comprehensive income |  |  | 628 |  |  |  | (254 | ) |  |  | (128 | )
Financial liabilities designated at fair value |  |  | (24 | ) |  |  | 8 |  |  |  | (37 | )
Total |  |  | 4,098 |  |  |  | (4,834 | ) |  |  | 4,181 |
(*) | Includes the ineffective derivatives portion related to hedge accounting.

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