 GRAND FORKS, N.D.--BUSINESS WIRE--Alerus Financial Corporation Alerus NASDAQ: ALRS, announced today it has entered into a definitive agreement to acquire Retirement Planning Services, Inc. RPS, which does business as RPS Plan Administrators and 24HourFlex. RPS provides retirement and health benefits administration for more than 1,000 plans, 48,000 plan participants, 300 COBRA clients, and 10,000 COBRA members, and brings more than 30 years of experience to Alerus robust retirement 