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Risk Management (Details 10)
Dec. 31, 2017
Dec. 31, 2016
Concentration Of Credit Risk In Loans And Advances [Abstract]    
Largest borrower 2.50% 2.30%
10 largest borrowers 8.20% 8.50%
20 largest borrowers 12.20% 12.60%
50 largest borrowers 17.80% 18.50%
100 largest borrowers 22.20% 23.00%