MidWestOne Bank. They offer financial services, loans, checking accounts, savings accounts, certifictes of deposits, IRA's, safe deposit boxes. Headquarters: Iowa City, IAMidWestOne Financial Group is a bank holding company headquartered in Iowa City, Iowa. The bank operates 57 branches. It is the 3rd. the word “progress” for MidWestOne Financial Group, of two long time and like-minded Iowa community banking State Bank in oskaloosa in 1987 and.