Mark Olson, who led Security State Bank in Fergus Falls before taking on a national role as a U.S. Federal Reserve board member and president of the American Bankers Association, has died at age 75. The Wall Street Journal has an obituary on Olson, who died September 12 at a hospital in Rockville, Md. Olson's father was a co-founder of Security State Bank, and he took over the bank in 1976 after working in banking in St.