Do establish clear rules of confidentiality. Staffers on both sides with access to a partnered bank's customer information should be carefully trained on how proprietary information, such as customer names, addresses and account information, will be used.
Don't compromise your bank's branded identity. For example, if your bank formed a partnership with another institution that provides customer service functions, make sure the service agents don't identify themselves using their institution's name.
Do retain the right to review all customer communication. Your partner may want to promote products and services beyond the scope of your agreement.
Don't try to hire away each other's employees. By resisting this natural temptation, you can help ensure that the partnership will last.