EXHIBIT 11 Redwood Empire Bancorp EARNINGS PER COMMON SHARE The Company adopted SFAS No. 128, EARNINGS PER SHARE. This statement replaces previous standards for reporting earnings per share with basic and diluted earnings per share. All earnings per share information has been restated to give effect to the new standards. Basic earnings per share excludes dilution and is computed by dividing income available to common shareholders by the weighted-average number of common shares outstanding for the period. Diluted earnings per share reflects the potential dilution that could occur if securities or other contracts to issue common stock were exercised or converted into common stock or resulted in the issuance of common stock that then shared in the earnings of the entity. The following table reconciles the numerator and denominator used in computing both basic earnings (loss) per share and diluted earnings (loss) per share for the periods indicated: Year Ended December 31, 1997 1996 1995 --------------------------------------- (in thousands except per share amounts) BASIC EARNINGS (LOSS) PER SHARE: Net income (loss) $3,441 ($1,486) $3,313 Less: Preferred stock dividend 449 449 336 ------ -------- ------ Net income (loss) available to common stock shareholders $2,992 ($1,935) $2,977 ------ -------- ------ ------ -------- ------ Weighted average common shares outstanding 2,776 2,721 2,671 ------ -------- ------ ------ -------- ------ Basic earnings (loss) per share $1.08 ($0.71) $1.11 ------ -------- ------ ------ -------- ------ DILUTED EARNINGS (LOSS) PER SHARE: Net income (loss) available to common stock shareholders $2,992 ($1,935) $2,977 Dilutive effect of Preferred Stock dividend 449 --- 336 ------ -------- ------ $3,441 ($1,935) $3,313 ------ -------- ------ ------ -------- ------ Weighted average common shares outstanding 2,776 2,721 2,671 Effect of outstanding stock options 103 --- 9 Effect of Convertible Preferred Stock 499 --- 499 ------ -------- ------ 3,378 2,721 3,179 ------ -------- ------ ------ -------- ------ Diluted earnings (loss) per share $1.02 ($0.71) $1.04 ------ -------- ------ ------ -------- ------