For a single, about $7000 is enough. Even for a couple, about $9150 is enougn. Both terms are in Canadian Dollars. now, a u.s. dollar=1.25 canadian dollar. So, you are fine.
Plus, the bank will show the average of at least 3 monthes of your balance. It is strange for IO to see such amount of money come in and go within a month or it is a heavy load for you to bear for couple of huandred dollars of interest.
You may be asked to re-submit another bank statement if the time period is longer 6 months from the date of application to the date of 2nd letter