Is what I do, giving food products from my company's produce to bank employees I deal with, and to other individuals with limited income, considered bribery, knowing that they sometimes prioritize my transactions?

There is no harm in giving gifts to employees, provided that their performance of duties does not depend on these gifts, that the reason for the gift is not merely because they are employees, that the gift does not lead to your company being favored over others or receiving something it does not deserve, and that the gift is known to the officials. It is important to note that it is not permissible to deal with usurious banks except out of necessity.