SIOUX CITY | David Luhman has joined Heritage Bank N.A. as commercial credit manager. He will be based in the downtown Sioux City area. Learn more about Heritage Bank N A on Singing Hills Blvd in Sioux City, Iowa (bank hours, contact details and bank overview.). Heritage Bank NA at Frances Building, 5th St #, Sioux City IA - ⏰hours, ✅address, map, ➦directions, ☎️phone number, customer ratings and.