First Interstate BancSys (NASDAQ:FIBK) reported quarterly earnings of $0.61 per share which missed the analyst consensus estimate of $0.63 by 3.17 percent. This is a 24.49 percent increase over earnings of $0.49 per share from the same period last year. The company reported quarterly sales of $241.800 million which missed the analyst consensus estimate of $242.786 million by 0.41 percent. This is a 2.11 percent decrease over sales of $247.000 million the same period last year.