Security Bank, SB is the only mutual savings bank located in Springfield, Illinois and has been servicing the community for over 144 years. We are a full-service financial institution that offers its customers both consumer and commercial credit products with a variety of deposit solutions. Security Bank, SB is the combination of 5 separate legacy banks which date back to 1874 (Workingmen’s Savings and Homestead Association (1874), Sangamon Savings and Homestead Association (1886), Springfield Bank and Loan Association (1886), Washington Park Bank and Savings Association (1902) and Security Improvement and Loan Association (1906)). Springfield is the state capital of Illinois and is the geographical center of Sangamon County which has a population of 197,499 as of 2016 according to U.S. Department of Commerce.