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Note 7 Probability of default of loans and advances to customers (Details)
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Subject to 12 month ECL [Member]      
Disclosure of probability of default [Line Items]      
Probability of default of loans and advances to customers 0.91% 0.894% 0.899%
Subject to 12 month ECL [Member] | 0 to 2 [Member]      
Disclosure of probability of default [Line Items]      
Probability of default of loans and advances to customers 0.051% 0.058% 0.04%
Subject to 12 month ECL [Member] | 2 to 5 [Member]      
Disclosure of probability of default [Line Items]      
Probability of default of loans and advances to customers 0.189% 0.157% 0.102%
Subject to 12 month ECL [Member] | 5 to 11 [Member]      
Disclosure of probability of default [Line Items]      
Probability of default of loans and advances to customers 0.163% 0.152% 0.077%
Subject to 12 month ECL [Member] | 11 to 39 [Member]      
Disclosure of probability of default [Line Items]      
Probability of default of loans and advances to customers 0.182% 0.187% 0.268%
Subject to 12 month ECL [Member] | 39 to 194 [Member]      
Disclosure of probability of default [Line Items]      
Probability of default of loans and advances to customers 0.203% 0.191% 0.24%
Subject to 12 month ECL [Member] | 194 to 1061 [Member]      
Disclosure of probability of default [Line Items]      
Probability of default of loans and advances to customers 0.105% 0.122% 0.151%
Subject to 12 month ECL [Member] | 1061 to 2121 [Member]      
Disclosure of probability of default [Line Items]      
Probability of default of loans and advances to customers 0.012% 0.019% 0.015%
Subject to 12 month ECL [Member] | More than 2121 [Member]      
Disclosure of probability of default [Line Items]      
Probability of default of loans and advances to customers 0.006% 0.008% 0.006%
Subject to lifetime ECL [Member]      
Disclosure of probability of default [Line Items]      
Probability of default of loans and advances to customers 0.09% 0.106% 0.101%
Subject to lifetime ECL [Member] | 0 to 2 [Member]      
Disclosure of probability of default [Line Items]      
Probability of default of loans and advances to customers 0.00% 0.00% 0.00%
Subject to lifetime ECL [Member] | 2 to 5 [Member]      
Disclosure of probability of default [Line Items]      
Probability of default of loans and advances to customers 0.003% 0.001% 0.001%
Subject to lifetime ECL [Member] | 5 to 11 [Member]      
Disclosure of probability of default [Line Items]      
Probability of default of loans and advances to customers 0.005% 0.002% 0.001%
Subject to lifetime ECL [Member] | 11 to 39 [Member]      
Disclosure of probability of default [Line Items]      
Probability of default of loans and advances to customers 0.008% 0.006% 0.005%
Subject to lifetime ECL [Member] | 39 to 194 [Member]      
Disclosure of probability of default [Line Items]      
Probability of default of loans and advances to customers 0.023% 0.025% 0.023%
Subject to lifetime ECL [Member] | 194 to 1061 [Member]      
Disclosure of probability of default [Line Items]      
Probability of default of loans and advances to customers 0.03% 0.038% 0.034%
Subject to lifetime ECL [Member] | 1061 to 2121 [Member]      
Disclosure of probability of default [Line Items]      
Probability of default of loans and advances to customers 0.009% 0.015% 0.012%
Subject to lifetime ECL [Member] | More than 2121 [Member]      
Disclosure of probability of default [Line Items]      
Probability of default of loans and advances to customers 0.011% 0.019% 0.025%