First Interstate Bancsystem Inc. reported unaudited consolidated earnings results for the fourth quarter and year ended December 31, 2013. For the quarter, the company's net interest income was $59.97 million compared with $60.97 million a year ago. Income before taxes was $31.9 million compared with $25.8 million a year ago. Net income was $20.8 million compared with $16.8 million a year ago. Net income available to common shareholders was $20.8 million or $0.47 per diluted share compared with $16.1 million or $0.37 per diluted share a year ago. As on December 31, 2013, the company's book value per share was $18.15 and tangible book value per share was $13.89. Return on average assets was 1.10% compared with 0.88% a year ago. Return on average common equity was 10.31% compared with 8.55% a year ago. Return on average tangible common equity was 13.49% compared with 11.45% a year ago.

For the year, the company's net interest income was $236.97 million compared with $243.8 million a year ago. Income before taxes was $132.7 million compared with $88.3 million a year ago. Net income was $86.1 million compared with $58.2 million a year ago. Net income available to common shareholders was $86.1 million or $1.96 per diluted share compared with $54.9 million or $1.27 per diluted share a year ago. Return on average assets was 1.16% compared with 0.79% a year ago. Return on average common equity was 11.05% compared with 7.46% a year ago. Return on average tangible common equity was 14.59% compared with 10.07% a year ago.

The company charged off loans of $6 million during fourth quarter of 2013 compared to $5 million during third quarter 2013 and $10 million during fourth quarter 2012.