Why can't you have a bank account if you file bankruptcy?

I've had a checking and savings account with Wells Fargo since I was 19 and am nnow 38 years old. I've never bounced a check in my life and for years had balances of over $40,000. I write at least 30 checks a month. Unfortunately I have to file bankruptcy because my house is in foreclosure. I have no other debt and my perfect credit is ruined due to the housing market not my irresponsibility. What