The Bank was founded by Thomas Hayden in 1897 and was located at 233 E. Main Street. In 1903, the Bank of Sun Prairie was chartered by the state with a Capital Stock balance of $25,000. Hayden served as the Bank's first President until December of 1911 when Henry Schey succeeded him. After the 1929 Stock Market Crash, Bank of Sun Prairie acquired the Farmers & Merchants Bank on the corner of East Main street and Columbus Street where it remained until 1955.

Schey remained as President until January of 1932 when Ed Schey became the third Bank President. Ed Schey carried the title of Bank of Sun Prairie President until October of 1932. It was at that time that George Mitchell became the fourth President of the Bank.

In November of 1955, the Bank moved to its present location at 228 East Main Street. An addition was built in 1963 expanding the Bank to the east in order to make room for an Installment Loan Department.

In May of 1967, the Bank was changing once more as two video drive-up lanes were added to make drive-up banking more convenient for its customers.

The Bank was again expanded and completely remodeled in 1972 as the Bank increased its lobby size and added three drive-up lanes giving the Bank a total of four drive-up lanes connected directly to the building. It was during this remodeling that the video drive-up lanes were discontinued.

In November of 1972 Tom Tubbs became the fifth President of Bank of Sun Prairie after having worked at the Bank for 15 years. During the time of Tubbs' election to Presidency the Bank was going through a major growth period that directly coincided with the growth of Sun Prairie from a small town to a suburban city. Assets of the Bank during this time grew from $9.0 million in 1965 to $44.2 million in 1977.

In December 1981, a second floor was added to the building and the drive-up was expanded from four to six lanes.

In 1990, the bank expanded by adding two new Sun Prairie offices. In May an office was opened at 550 Broadway Drive and in June an office was opened at 119 Wilburn Road. These locations provide full-service banking with safe deposit boxes and drive-up lanes. Giving our customers the convenience of banking at any of our three locations.

In 1994 the appearance of the Main Office changed once again, with the addition of 3,400 square feet to the second floor of the building. This change was necessary to accommodate the growth of the bank's lending departments. Land was also purchased near the Main Street location to provide parking for our growing staff.

In February 1999 the Bank expanded once more, with the opening of its fourth office in the Village of Cottage Grove. Cottage Grove is a growing community in Northeastern Dane County. Our Cottage Grove Office is a Full-Service facility, in addition, to offering its customers four full-service locations with which to conduct their business.

In June 2006, Tom Tubbs was named Chairman of the Board and remains active in the day to day operations of the bank.  Alice Hensen was promoted to President making her the bank's sixth president and the only woman bank president in Dane County.

The Bank's continued growth is evident with the added services provided to our customers. Technology plays an important part in the banking industry today. The addition of ATM machines, 24-hour telephone banking on our PAL (Private Access Line), a Website and Internet Banking are examples of the Bank of Sun Prairie's effort to meet the needs of our customers.

The Bank of Sun Prairie remains an independent bank and full service financial institution.