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Regulatory Capital Requirements (Details) - Dec. 31, 2017
$ in Millions
USD ($)
CAD
Banking and Thrift [Abstract]    
Minimum capital requirement $ 4.0  
Excess from Minimum capital requirement 16.8  
Required combined cash and receivables | CAD   CAD 100,000
Combined cash and receivables $ 37.2 CAD 46,800,000