What is the routing number for first security bank? 104113819 routing number is a 9-digit number designed and assigned to Security First Bank by The American Bankers Association (ABA) to identify the financial institution upon which a payment was drawn.What is first bank customer care number? First Interstate Bank Credit Card toll free customer service number : +1-888-752-3332, +1-307-684-2581.What is the address for first security bank? First Security Bank. Address. 100 West Emma Avenue, Springdale, Arkansas, 72764. Phone. 479-750-5500.What was first security bank? Company history. First Security Bank was chartered in 1932 in Searcy, Arkansas, under the name of Security Bank. In 1966, the name was officially changed to First Security Bank. The bank was originally located at the corner of Arch Street and Spring Street but in 1971 moved to its current location at 314 N.