Customers are dumping their banks in droves ahead of the nationwide “Move Your Money” and “Bank Transfer Day” movements this Saturday. Given the recent spotlight on attempts — and ultimate failures — by some of the nation’s biggest banks to tack on new debit card fees, thousands of disgruntled consumers have already either left or pledged to leave their current bank for a community bank or credit union, which are known for having fewer and/or lower bank account fees. At least 650,000 consumers have already joined credit unions since Sept. 29, the day Bank of America announced plans to impose its controversial $5 debit card fee, according to a nationwide survey of credit unions by the Credit Union National Association.