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Parent Company Condensed Financial Statements (Condensed Statements Of Income) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Interest and dividends on investment securities | $ 216,793 | $ 237,487 | $ 240,187
Salaries and employee benefits | 512,987 | 492,927 | 468,194
Data processing fees paid to affiliates | 95,325 | 92,899 | 85,978
Other | 57,429 | 73,046 | 78,295
Total non-interest expense | 768,378 | 767,398 | 737,821
Income tax expense (benefit) | 87,293 | 109,074 | 105,949
NET INCOME ATTRIBUTABLE TO COMMERCE BANCSHARES, INC. | 354,057 | 421,231 | 433,542
Commerce Bancshares, Inc. (Parent) [Member] |  |  |
Dividends received from consolidated subsidiary banks | 210,001 | 500,000 | 200,000
Earnings of consolidated subsidiaries, net of dividends | 148,435 | (79,641) | 233,785
Interest and dividends on investment securities | 1,802 | 1,698 | 10,698
Management fees charged subsidiaries | 33,472 | 36,776 | 37,688
Investment securities gains (losses) | 53 | 3,572 | (4,581)
Net interest income on advances and note to subsidiaries | 233 | 1,208 | 1,299
Other | 4,282 | 4,700 | 2,390
Total income | 398,278 | 468,313 | 481,279
Salaries and employee benefits | 31,277 | 32,882 | 33,588
Professional fees | 1,977 | 2,050 | 2,383
Data processing fees paid to affiliates | 2,765 | 3,142 | 3,341
Other | 11,850 | 13,106 | 10,881
Total non-interest expense | 47,869 | 51,180 | 50,193
Income tax expense (benefit) | (3,648) | (4,098) | (2,456)
NET INCOME ATTRIBUTABLE TO COMMERCE BANCSHARES, INC. | $ 354,057 | $ 421,231 | $ 433,542

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