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Parent Company Condensed Financial Statements (Condensed Balance Sheets) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2017
--- | --- | --- | ---
Equity Securities, FV-NI and without Readily Determinable Fair Value | $ 4,363 | $ 4,209 |
Other assets | 567,248 | 476,400 |
Total assets | 32,922,974 | 26,065,789 |
Other liabilities | 477,072 | 553,712 |
Total liabilities | 29,523,002 | 22,927,317 |
Stockholders’ equity | 3,397,047 | 3,134,684 |
Total liabilities and equity | 32,922,974 | 26,065,789 |
Commerce Bancshares, Inc. (Parent) [Member] |  |  |
Investment in consolidated subsidiary, Banks | 3,077,713 | 2,687,692 |
Investment in consolidated subsidiaries, Non-banks | 67,710 | 71,290 |
Cash | 171,943 | 301,913 |
Available for sale securities | 4,795 | 1,399 |
Equity Securities, FV-NI and without Readily Determinable Fair Value | 3,135 | 2,969 |
Note receivable due from bank subsidiary | 50,000 | 50,000 | $ 50,000
Advances to subsidiaries, net of borrowings | 31,907 | 26,097 |
Income tax benefits | 10,990 | 9,973 |
Other assets | 26,222 | 23,528 |
Total assets | 3,444,415 | 3,174,861 |
Pension obligation | 17,548 | 13,028 |
Other liabilities | 29,820 | 27,149 |
Total liabilities | 47,368 | 40,177 |
Stockholders’ equity | 3,397,047 | 3,134,684 |
Total liabilities and equity | $ 3,444,415 | $ 3,174,861 |

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