You didn't provide much info about your Oliver Bain so it's hard to tell.
This Oliver also went by O. B. Bain Residence: Dubois, Clark, Idaho Spouse: Elsie M. Wilhite Residence: Blackfoot, Bingham, Idaho Married: Feb. 16, 1916, Blackfoot, Bingham, Idaho. Source: Idaho Marriages 1842-1996.
I also found the family in 1940 in Worland, Washakie, Wyoming. Oliver B. Bain, b. KS, 51, laborer canal. Elsie M., wife, b. IN, 51. Dorothy M., b. ID, 17. Ralph B., b. ID, 11. Norman E., b. WY, 9.
Wyoming doesn't publish their death index so I can't tell if he died there or not. Successful Searching!