First Interstate BancSys (NASDAQ:FIBK) reported quarterly earnings of $0.87 per share which beat the analyst consensus estimate of $0.71 by 22.54 percent. This is a 26.09 percent increase over earnings of $0.69 per share from the same period last year. The company reported quarterly sales of $263.900 million which beat the analyst consensus estimate of $249.342 million by 5.84 percent. This is a 6.28 percent increase over sales of $248.300 million the same period last year.