EXHIBIT 11 FIRST FINANCIAL CORPORATION COMPUTATION OF EARNINGS PER SHARE For The Three Months Ended March 31, 1994 1993 (In thousands, except per share data) PRIMARY EARNINGS PER SHARE Net income $12,280 $ 9,549 Shares: Weighted average common shares outstanding 24,555 23,350 Shares from assumed exercise of options (as determined by the treasury stock method) 739 305 Common and common equivalent shares 25,294 23,655 Primary Earnings Per Common Share $ .49 $ .40 FULLY DILUTED EARNINGS PER SHARE Net income $12,280 $ 9,549 Shares: Weighted average common shares outstanding 24,555 23,350 Shares from assumed exercise of options (as determined by the treasury stock method) 744 701 Common and common equivalent shares 25,299 24,051 Fully Diluted Earnings Per Common Share $ .49 $ .40