RCB Bank was established in Claremore, Oklahoma, and first opened its doors for business on Saturday, January 4, 1936, at 9:00 a.m. It was known then as Rogers County Bank and consisted of one branch.

The bank began as an entrepreneurship with L.S. Robson and George Davis during the days of the Great Depression. From day one in the lean times of the Great Depression, the Bank worked to become a strong and reliable financial institution within the community and those efforts quickly resulted in growth of the company.

The Bank ended the first year with a profit, a feat the Bank has repeated every year since.