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Risk Management - Risk Management Structure (Details)
12 Months Ended
Dec. 31, 2018
CLF ( )
director
Dec. 31, 2017
Risk Management    
Number of directors in Finance, International and Financial Risk Committee 4  
Minimum amount for review of approved application by Directors Credit Committee | 750,000  
Number of directors in Portfolio Risk Committee 2  
Maximum exposure to credit risk does not exceed (in percentage) 10.00% 10.00%