First Security Bank was founded in 1907 as the First National Bank of Mackinaw. A few years later, the bank purchased the original Mackinaw Bank, which was founded in 1882. In the mid 1960’s, the bank changed to a state chartered bank and was renamed First Security Bank. The mission of First Security Bank has always been to serve the financial needs of the local community.

For over 100 years, First Security Bank has grown to over $100 million in assets and four branches. The Mackinaw Banking Center, located at 101 East Fast Avenue, is the headquarters of the corporation. Branches were added in Heritage Lake in 1998, Deer Creek in 2002, and Danvers in 2008.  In 2025, First Security Bank opened its first Loan Production Office in Peoria, IL.

Since our establishment, we have strived to exceed expectations by offering the finest products, exceptional service, and unwavering commitment to our local communities. The bank prides itself on offering a full menu of financial services, including commercial, agriculture, and consumer loans, all types of savings and checking accounts, investment services, on-line and mobile banking, and four full service branches with 24 hour ATM’s at each location.

Recognizing the significance of technology in modern banking, we are consistently working on innovation. By staying ahead of the technological curve, we ensure that our customers have access to convenient, secure, and cutting-edge banking solutions. From online and mobile banking platforms to robust security measures, we leverage technology to enhance the banking experience while safeguarding our customers’ private information.

Financial Information

For in-depth financial information, including our balance sheet, income statement, performance and condition ratios, or demographic information, click here to access the FDIC’s Institutional Directory database. Our FDIC Certificate number is 3698. Then close the browser window to return.