The average Net Interest Margin (NIM) figure for the U.S. banking industry was 3.30% in 2018. On the other hand, Capital One's Net Interest Margin figure for 2018 was 6.87% - more than double the industry average.
Capital One's loan portfolio has a much higher proportion of credit card loans compared to its peers. As card loans attract the highest interest among various loan categories, Capital One's NIM figure is much higher than that for the largest U.S. banks
Click here to understand how changes in Capital One's Net Interest Margin (NIM) affect its revenues, earnings and stock.