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Common Stock | 3 Months Ended
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Mar. 31, 2026
Common Stock [Abstract] |
Common Stock | Common Stock * Presented below is a summary of the components used to calculate basic and diluted income per share. The Company applies the two-class method of computing income per share, as nonvested restricted stock awards that pay nonforfeitable common stock dividends are considered securities which participate in undistributed earnings with common stock. The two-class method requires the calculation of separate income per share amounts for the nonvested restricted stock awards and for common stock. Income per share attributable to common stock is shown in the table below. Nonvested share-based awards are further discussed in Note 14.
|  |  | For the Three Months Ended March 31
(In thousands, except per share data) |  |  |  | 2026 | 2025
Basic income per common share: |  |  |  |  |
Net income attributable to Commerce Bancshares, Inc. |  |  |  | $ | 141,623 |  | $ | 131,592 |
Less income allocated to nonvested restricted stock awards |  |  |  | 1,314 |  | 1,259 |
Net income allocated to common stock |  |  |  | $ | 140,309 |  | $ | 130,333 |
Weighted average common shares outstanding |  |  |  | 145,786 |  | 139,563 |
Basic income per common share |  |  |  | $ | .96 |  | $ | .93 |
Diluted income per common share: |  |  |  |  |
Net income attributable to Commerce Bancshares, Inc. |  |  |  | $ | 141,623 |  | $ | 131,592 |
Less income allocated to nonvested restricted stock awards |  |  |  | 1,313 |  | 1,258 |
Net income allocated to common stock |  |  |  | $ | 140,310 |  | $ | 130,334 |
Weighted average common shares outstanding |  |  |  | 145,786 |  | 139,563 |
Net effect of assumed exercise of stock appreciation rights and restricted stock units - based on the treasury stock method using the average market price for the respective periods |  |  |  | 71 |  | 162 |
Weighted average diluted common shares outstanding |  |  |  | 145,857 |  | 139,725 |
Diluted income per common share |  |  |  | $ | .96 |  | $ | .93 |
Unexercised stock appreciation rights of 439 thousand and 167 thousand for the three month periods ended March 31, 2026 and 2025, respectively, were excluded from the computation of diluted income per common share because their inclusion would have been anti-dilutive. Nonvested time-vested restricted stock units of 42 thousand for the three month period ended March 31, 2026 were excluded from the computation of diluted income per common share because their inclusion would have been anti-dilutive. * All prior year share and per share amounts in this note have been restated for the 5% common stock dividend distributed in December 2025.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482662/260-10-50-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 260 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/260/tableOfContent Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482662/260-10-50-2 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482662/260-10-50-3 + Details
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