Exhibit 11 - Computation of Earnings Per Common Share TCF FINANCIAL CORPORATION AND SUBSIDIARIES Computation of Earnings Per Common Share (Dollars in thousands, except per-share data) (Unaudited) Computation of Basic Earnings Per Common Three Months Ended Share for Statements of Operations: March 31, - ---------------------------------------- ---------------------------- 1998 1997 ----------- ----------- Income applicable to common shareholders $ 39,894 $ 33,027 ----------- ----------- ----------- ----------- Weighted average common shares outstanding 90,914,027 80,778,560 ----------- ----------- ----------- ----------- Basic earnings per common share $ .44 $ .41 ----------- ----------- ----------- ----------- Computation of Diluted Earnings Per Common Share for Statements of Operations: - ---------------------------------------- Net income $ 39,894 $ 33,027 Add: Interest expense on 7 1/4% convertible subordinated debentures, net of tax -- 79 ----------- ----------- Income applicable to common shareholders including effect of dilutive securities $ 39,894 $ 33,106 ----------- ----------- ----------- ----------- Weighted average number of common shares outstanding adjusted for effect of dilutive securities: Weighted average common shares outstanding used in basic earnings per common share calculation 90,914,027 80,778,560 Net dilutive effect of: Stock option plans 391,541 517,970 Restricted stock plans 510,912 835,847 Assumed conversion of 7 1/4% convertible subordinated debentures -- 838,634 ----------- ----------- 91,816,480 82,971,011 ----------- ----------- ----------- ----------- Diluted earnings per common share $ .43 $ .40 ----------- ----------- ----------- -----------