 TACOMA, Wash. AP _ Columbia Banking System Inc. COLB on Thursday reported first-quarter earnings of 14.6 million. The Tacoma, Washington-based bank said it had earnings of 20 cents per share. The bank holding company posted revenue of 152.1 million in the period. Its revenue net of interest expense was 143.6 million, falling short of Street forecasts. Columbia Banking shares have fallen 29 since the beginning of the year. ___ This story was generated by Automated Insights using data from Zacks Investment Research. Access a Zacks stock report on COLB at 