First Interstate BancSys (NASDAQ:FIBK) reported quarterly earnings of $0.49 per share which missed the analyst consensus estimate of $0.56 by 12.5 percent. This is a 14.04 percent decrease over earnings of $0.57 per share from the same period last year. The company reported quarterly sales of $247.00 million which missed the analyst consensus estimate of $253.88 million by 2.71 percent. This is a 1.98 percent increase over sales of $242.20 million the same period last year.