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Loans (Details Textual)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Fixed interest rate [member]    
Disclosure of detailed information about financial instruments [line items]    
Percentage of loan portfolio at fixed interest rate maturing in not more than one hundred and eight days 41.00% 74.00%
Annual interest rate [Member] | Minimum    
Disclosure of detailed information about financial instruments [line items]    
Interest rate fluctuations of loans at amortized cost, financial assets 0.43% 1.20%
Annual interest rate [Member] | Maximum    
Disclosure of detailed information about financial instruments [line items]    
Interest rate fluctuations of loans at amortized cost, financial assets 9.70% 13.93%