First National Bank, Ames, IA. likes · 81 talking about this · were here. beatsbydre.us First National Bank - What Banking Should Be. First National Bank, Ames, Iowa is headquartered in Ames and is the 22nd largest bank in the state of Iowa. It is also the th largest bank in the nation. Get your account information anytime, anywhere with the FNB Mobile App from First National Bank serving Ames, Ankeny, Johnston and West Des Moines, Iowa.