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Common and Preferred Stock (Tables) | 12 Months Ended
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Dec. 31, 2020
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract] |
Summary Of Components Used To Calculate Basic And Diluted Income Per Share |
(In thousands, except per share data) | 2020 | 2019 | 2018
Basic income per common share: |  |  |
Net income attributable to Commerce Bancshares, Inc. | $ | 354,057 |  | $ | 421,231 |  | $ | 433,542 |
Less preferred stock dividends | 11,966 |  | 9,000 |  | 9,000 |
Net income available to common shareholders | 342,091 |  | 412,231 |  | 424,542 |
Less income allocated to nonvested restricted stock | 3,215 |  | 4,019 |  | 4,558 |
Net income allocated to common stock | $ | 338,876 |  | $ | 408,212 |  | $ | 419,984 |
Weighted average common shares outstanding | 116,360 |  | 119,473 |  | 122,170 |
Basic income per common share | $ | 2.91 |  | $ | 3.42 |  | $ | 3.44 |
Diluted income per common share: |  |  |
Net income available to common shareholders | $ | 342,091 |  | $ | 412,231 |  | $ | 424,542 |
Less income allocated to nonvested restricted stock | 3,211 |  | 4,012 |  | 4,547 |
Net income allocated to common stock | $ | 338,880 |  | $ | 408,219 |  | $ | 419,995 |
Weighted average common shares outstanding | 116,360 |  | 119,473 |  | 122,170 |
Net effect of the assumed exercise of stock-based awards -- based on the treasury stock method using the average market price for the respective periods | 224 | 297 | 379
Weighted average diluted common shares outstanding | 116,584 |  | 119,770 |  | 122,549 |
Diluted income per common share | $ | 2.91 |  | $ | 3.41 |  | $ | 3.43 |
Schedule Of Activity In The Outstanding Shares Of The Company's Common Stock | The table below shows activity in the outstanding shares of the Company’s common stock during the past three years. Shares in the table below are presented on an historical basis and have not been restated for the annual 5% stock dividends.
| Years Ended December 31
(In thousands) | 2020 | 2019 | 2018
Shares outstanding at January 1 | 112,132 |  | 111,129 |  | 106,615 |
Issuance of stock: |  |  |
Awards and sales under employee and director plans | 335 |  | 329 | 416
5% stock dividend | 5,574 |  | 5,359 |  | 5,305 |
Other purchases of treasury stock | (887) |  | (4,670) |  | (1,194) |
Other | (16) |  | (15) |  | (13) |
Shares outstanding at December 31 | 117,138 |  | 112,132 |  | 111,129 |

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