It operates in Iowa, Minnesota, Wisconsin, Colorado, and Florida.

[3] In 1983, ISB Financial Corp. was established as a closely held bank holding company for Iowa State Bank & Trust Company.

[5] In May 2015, the bank acquired Central Bancshares of Golden Valley, Minnesota for $134 million in cash and stock.

[7] In June 2018, Barry S. Ray was hired as the Chief Financial Officer.

In November 2022, Charles N. Reeves was hired as the Chief Executive Officer.