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) Year Ended December 31, Computation of Basic Earnings Per Common ------------------------------------------------- Share for Statements of Operations: 1998 1997 1996 - ---------------------------------------- ----------- ----------- ----------- Net income $ 156,179 $ 145,061 $ 100,377 ----------- ----------- ----------- ----------- ----------- ----------- Weighted average common shares outstanding 88,092,895 84,477,536 81,903,690 ----------- ----------- ----------- ----------- ----------- ----------- Basic earnings per common share $ 1.77 $ 1.72 $ 1.23 ----------- ----------- ----------- ----------- ----------- ----------- Computation of Diluted Earnings Per Common Share for Statements of Operations: - ---------------------------------------- Net income $ 156,179 $ 145,061 $ 100,377 Add: Interest expense on 7 1/4% convertible subordinated debentures, net of tax - 132 328 ----------- ----------- ----------- Income applicable to common shareholders including effect of dilutive securities $ 156,179 $ 145,193 $ 100,705 ----------- ----------- ----------- ----------- ----------- ----------- 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 88,092,895 84,477,536 81,903,690 Net dilutive effect of: Stock option plans 346,434 468,275 537,900 Restricted stock plans 476,486 838,189 654,918 Assumed conversion of 7 1/4% convertible subordinated debentures - 349,936 842,850 ----------- ----------- ----------- 88,915,815 86,133,936 83,939,358 ----------- ----------- ----------- ----------- ----------- ----------- Diluted earnings per common share $ 1.76 $ 1.69 $ 1.20 ----------- ----------- ----------- ----------- ----------- -----------