EXHIBIT 11 COMPUTATION OF PER SHARE EARNINGS YEAR ENDED DECEMBER 31 1998 1997 1996 ------- ------- ------- (Amounts in thousands, except per share amounts) BASIC: Average shares outstanding 13,486 13,427 13,388 Net income $26,046 $23,889 $22,003 ======= ======= ======= Net income per common share $ 1.93 $ 1.78 $ 1.64 ======= ======= ======= DILUTED: Average shares outstanding 13,486 13,427 13,388 Net effect of the assumed exercise of stock options-based on the treasury stock method using average market price 150 159 194 ------- ------- ------- 13,636 13,586 13,582 ======= ======= ======= Net income $26,046 $23,889 $22,003 ======= ======= ======= Net income per common share $ 1.91 $ 1.76 $ 1.62 ======= ======= =======