First Interstate BancSys (NASDAQ:FIBK) reported quarterly earnings of $0.54 per share which missed the analyst consensus estimate of $0.58 by 6.9 percent. This is a 22.86 percent decrease over earnings of $0.70 per share from the same period last year. The company reported quarterly sales of $251.90 million which beat the analyst consensus estimate of $250.67 million by 0.49 percent. This is a 1.49 percent decrease over sales of $255.70 million the same period last year.