Managing your bank accounts might seem like a simple task, but banking mistakes can cost you money and even put your account security at risk. To help keep you safe and secure financially, GOBankingRates spoke with Sean Duffey, director of sales strategy and performance at First Merchants Corporation, to hear what constitute the most common mistakes and how you can avoid them in your own account. Keeping All Your Money in One Account If you keep all of your money in one account, it can be more difficul ...