If you have the proper documentation to seize a debtor's bank account, generally this is handled at the state level. Therefore, you should contact the Wells Fargo in Texas if the defendant lives in Dallas. It is not required that you have knowledge of the branch where the defendant holds an account. Now, whether the defendant's salary is exempt is a state law issue. Generally speaking, most state laws do not have an outright exemption for salary. They may have a percentage of the salary that is exempt and you should contact an attorney in Dallas to discuss garnishing the defendant's wages.