Wells Fargo Insurance Services Inc. has bought Insurance Brokers of America in Brentwood for an undisclosed sum.

The 13-person firm will continue to operate from offices at 1401 South Brentwood Boulevard. Irene Mitchell, president of Insurance Brokers, said she is excited about the change. Her firm offers risk management services including property and casualty insurance and employee benefits to businesses.

Wells Fargo is the nation’s fifth largest insurance brokerage in the United States and the largest one owned by a bank.