CANFIELD, Ohio--(BUSINESS WIRE)--Farmers National Bank President and CEO Kevin J. Helmick announces the appointment of Mark R. Witmer to Senior Executive Vice President, Chief Banking Officer and the promotion of Tim Shaffer to Senior Vice President, Regional President. Prior to this announcement, Witmer was the President & CEO of the former First National Bank of Orrville that is now Farmers National Bank and Shaffer was Farmers’ Senior Vice President, Commercial Banking/Private Client Ser