Exhibit 11 Statement of computation of earnings per share. 167 Statements re: Computation of Earnings Per Share Brenton Banks, Inc. December 31, 1997 1996 1995 Basic EPS Computation Numerator: Net income $ 18,010,107 $ 14,015,430 $ 10,407,354 Denominator: Average common shares outstanding 17,504,716 18,091,614 18,569,224 Basic EPS $ 1.03 $ 0.78 $ 0.56 Diluted EPS Computation Numerator: Net income $ 18,010,107 $ 14,015,430 $ 10,407,354 Denominator: Average common shares outstanding 17,504,716 18,091,614 18,569,224 Average stock options 283,912 160,792 140,501 Average long-term stock compensation plan 140,154 195,527 192,854 17,928,782 18,447,933 18,902,579 Diluted EPS $ 1.01 $ 0.76 $ 0.55 <FN> Note: Amounts are restated for the 2-for-1 stock split effective February 1998 and the 10% common stock dividends effective in 1997 and 1996. 168