Steve is a young man with a long psychiatric history. One day he decided to apply for a credit card from his local bank. He filled out the forms, submitted them to the bank and soon after received a credit card. Not fully understanding the consequences of using the card for purchases, he quickly racked up thousands of dollars of debt. After numerous missed payments, the bank brought an action in court to sue Steve for the balance owing. Steve's lawyer argued that the contract was voidable because of mental incompetence. He submitted medical evidence to show that Steve was incompetent at the time he entered into the credit card contract.

Question: Will the bank be able to sue Steve for the outstanding balance? What additional piece of information would be helpful to make a conclusive determination here?