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Note 8 - Fair Value - Significant Unobservable Inputs Used In Fair Value Measurement Of Assets (Details) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Loans and advances [Member] | Bottom Of Range Member | Net Present Value [Member] |  |  |
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items |  |  |
Repo Funding Curve | (1,00%) | (6) |
Loans and advances [Member] | Weighted Average Member | Net Present Value [Member] |  |  |
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items |  |  |
Repo Funding Curve | 0,00% | 16 |
Loans and advances [Member] | Top Of Range [Member] | Net Present Value [Member] |  |  |
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items |  |  |
Repo Funding Curve | 1,00% | 100 |
Debt Securities [Member] | Bottom Of Range Member | Net Present Value [Member] |  |  |
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items |  |  |
Credit Spread | 4,32 |  |
Recovery Rate | 0,00% |  |
Comparable Prices Inputs | 0,10% |  |
Debt Securities [Member] | Bottom Of Range Member | Market Comparable Prices Member |  |  |
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items |  |  |
Credit Spread |  | 18 | 37
Recovery Rate |  | 0,00% | 0,00%
Comparable Prices Inputs |  | 0,01% | 1,00%
Debt Securities [Member] | Weighted Average Member | Net Present Value [Member] |  |  |
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items |  |  |
Credit Spread | 47,01 |  |
Recovery Rate | 37,06% |  |
Comparable Prices Inputs | 99,92% |  |
Debt Securities [Member] | Weighted Average Member | Market Comparable Prices Member |  |  |
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items |  |  |
Credit Spread |  | 83 | 152
Recovery Rate |  | 28,38% | 32,06%
Comparable Prices Inputs |  | 98,31% | 88,00%
Debt Securities [Member] | Top Of Range [Member] | Net Present Value [Member] |  |  |
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items |  |  |
Credit Spread | 564,22 |  |
Recovery Rate | 40,00% |  |
Comparable Prices Inputs | 143,87% |  |
Debt Securities [Member] | Top Of Range [Member] | Market Comparable Prices Member |  |  |
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items |  |  |
Credit Spread |  | 504 | 385
Recovery Rate |  | 40,00% | 40,00%
Comparable Prices Inputs |  | 135,94% | 275,00%
Credit Option [Member] | Bottom Of Range Member | Gaussian Copula [Member] |  |  |
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items |  |  |
Correlation Default |  | 19,37% | 0,00%
Credit Option [Member] | Weighted Average Member | Gaussian Copula [Member] |  |  |
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items |  |  |
Correlation Default |  | 44,33% | 37,98%
Credit Option [Member] | Top Of Range [Member] | Gaussian Copula [Member] |  |  |
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items |  |  |
Correlation Default |  | 61,08% | 60,26%
Corporate Bond Option [Member] | Bottom Of Range Member | Black 76 [Member] |  |  |
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items |  |  |
Price Volatility |  | - | -
Corporate Bond Option [Member] | Weighted Average Member | Black 76 [Member] |  |  |
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items |  |  |
Price Volatility |  | - | -
Corporate Bond Option [Member] | Top Of Range [Member] | Black 76 [Member] |  |  |
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items |  |  |
Price Volatility |  | - | -
Equity OTC Option [Member] | Bottom Of Range Member | Heston [Member] |  |  |
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items |  |  |
Volatility Inputs |  |  | 13,79
Forward Volatility |  | 35,12 | 47,05
Equity OTC Option [Member] | Bottom Of Range Member | Local volatility [Member] |  |  |
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items |  |  |
Volatility Inputs |  | 2,49 |
Equity OTC Option [Member] | Weighted Average Member | Heston [Member] |  |  |
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items |  |  |
Volatility Inputs |  |  | 27,24
Forward Volatility |  | 35,12 | 47,05
Equity OTC Option [Member] | Weighted Average Member | Local volatility [Member] |  |  |
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items |  |  |
Volatility Inputs |  | 23,21 |
Equity OTC Option [Member] | Top Of Range [Member] | Heston [Member] |  |  |
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items |  |  |
Volatility Inputs |  |  | 65,02
Forward Volatility |  | 35,12 | 47,05
Equity OTC Option [Member] | Top Of Range [Member] | Local volatility [Member] |  |  |
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items |  |  |
Volatility Inputs |  | 60,90 |
Equity OTC FX Option [Member] | Bottom Of Range Member | Black Scholes Local Voatility [Member] |  |  |
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items |  |  |
Volatility Inputs |  | 3,70 | 5,05
Equity OTC FX Option [Member] | Weighted Average Member | Black Scholes Local Voatility [Member] |  |  |
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items |  |  |
Volatility Inputs |  | 6,30 | 7,73
Equity OTC FX Option [Member] | Top Of Range [Member] | Black Scholes Local Voatility [Member] |  |  |
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items |  |  |
Volatility Inputs |  | 10,05 | 9,71
Interest Rate Option [Member] | Bottom Of Range Member | Libor Market Model [Member] |  |  |
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items |  |  |
Beta (significant unobservable item) |  | 0,25 | 0,25
Correlation Rate Credit |  | (100) | (100)
Credit Default Volatility |  | - | -
Interest Rate Option [Member] | Weighted Average Member | Libor Market Model [Member] |  |  |
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items |  |  |
Beta (significant unobservable item) |  | 2,00 | 9,00
Credit Default Volatility |  | - | -
Interest Rate Option [Member] | Top Of Range [Member] | Libor Market Model [Member] |  |  |
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items |  |  |
Beta (significant unobservable item) |  | 18,00 | 18,00
Correlation Rate Credit |  | 100 | 100
Credit Default Volatility |  | - | -
Credit Derivatives [Member] | Bottom Of Range Member | Gaussian Copula [Member] |  |  |
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items |  |  |
Correlation Default | 30,40% |  |
Credit Derivatives [Member] | Weighted Average Member | Gaussian Copula [Member] |  |  |
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items |  |  |
Correlation Default | 44,87% |  |
Credit Derivatives [Member] | Top Of Range [Member] | Gaussian Copula [Member] |  |  |
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items |  |  |
Correlation Default | 60,95% |  |
Variable Income Derivatives [Member] | Bottom Of Range Member | Option Models On Equities Baskets Of Equity Funds [Member] |  |  |
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items |  |  |
Correlations Inputs | (100%) |  |
Volatility Inputs | 6,52 |  |
Variable Income Derivatives [Member] | Weighted Average Member | Option Models On Equities Baskets Of Equity Funds [Member] |  |  |
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items |  |  |
Correlations Inputs | 100% |  |
Volatility Inputs | 29,90 |  |
Variable Income Derivatives [Member] | Top Of Range [Member] | Option Models On Equities Baskets Of Equity Funds [Member] |  |  |
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items |  |  |
Correlations Inputs | 100% |  |
Volatility Inputs | 141,77 |  |
Exchange Rate Derivatives [Member] | Bottom Of Range Member | Option Models Of FX Underlyings [Member] |  |  |
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items |  |  |
Volatility Inputs | 4,11 |  |
Exchange Rate Derivatives [Member] | Weighted Average Member | Option Models Of FX Underlyings [Member] |  |  |
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items |  |  |
Volatility Inputs | 10,00 |  |
Exchange Rate Derivatives [Member] | Top Of Range [Member] | Option Models Of FX Underlyings [Member] |  |  |
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items |  |  |
Volatility Inputs | 16,14 |  |
Interest Rate Derivatives [Member] | Bottom Of Range Member | Option Models On IR Underlying [Member] |  |  |
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items |  |  |
Beta (significant unobservable item) | 0,25 |  |
Correlation Rate Credit | (100) |  |
Credit Default Volatility | - |  |
Interest Rate Derivatives [Member] | Weighted Average Member | Option Models On IR Underlying [Member] |  |  |
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items |  |  |
Beta (significant unobservable item) | 2,00 |  |
Credit Default Volatility | - |  |
Interest Rate Derivatives [Member] | Top Of Range [Member] | Option Models On IR Underlying [Member] |  |  |
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items |  |  |
Beta (significant unobservable item) | 18,00 |  |
Correlation Rate Credit | 100 |  |
Credit Default Volatility | - |  |

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