Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
ASSETS
Loans	$ 11,469,238	$ 10,956,836
Allowance for loan losses	(156,532)	(161,532)
Net loans	11,312,706	10,795,304
Investment securities:
Available for sale ($467,143 and $687,680 pledged in 2013 and 2012, respectively, to secure repurchase agreements)	9,523,560us-gaap_AvailableForSaleSecurities	8,915,680us-gaap_AvailableForSaleSecurities
Trading	15,357us-gaap_TradingSecurities	19,993us-gaap_TradingSecurities
Non-marketable	106,875cbsh_NonMarketableSecurities	107,324cbsh_NonMarketableSecurities
Total investment securities	9,645,792cbsh_TotalInvestmentSecurities	9,042,997cbsh_TotalInvestmentSecurities
Short-term federal funds sold and securities purchased under agreements to resell	32,485	43,845
Long-term securities purchased under agreements to resell	1,050,000	1,150,000
Interest earning deposits with banks	600,744cbsh_InterestBearingDepositsWithFrb	707,249cbsh_InterestBearingDepositsWithFrb
Cash and due from banks	467,488us-gaap_CashAndDueFromBanks	518,420us-gaap_CashAndDueFromBanks
Land, buildings and equipment – net	357,871us-gaap_PropertyPlantAndEquipmentNet	349,654us-gaap_PropertyPlantAndEquipmentNet
Goodwill	138,921us-gaap_Goodwill	138,921us-gaap_Goodwill
Other intangible assets – net	7,450	9,268
Other assets	380,823us-gaap_OtherAssets	316,378us-gaap_OtherAssets
Total assets	23,994,280us-gaap_Assets	23,072,036us-gaap_Assets
LIABILITIES AND STOCKHOLDERS’ EQUITY
Non-interest bearing	6,811,959	6,750,674
Savings, interest checking and money market	10,541,601	10,108,236
Time open and C.D.’s of less than $100,000	878,433us-gaap_TimeDepositsLessThan100000	983,689us-gaap_TimeDepositsLessThan100000
Time open and C.D.’s of $100,000 and over	1,243,785	1,204,749
Total deposits	19,475,778us-gaap_Deposits	19,047,348us-gaap_Deposits
Federal funds purchased and securities sold under agreements to repurchase	1,862,518	1,346,558
Other borrowings	104,058us-gaap_OtherBorrowings	107,310us-gaap_OtherBorrowings
Other liabilities	217,680us-gaap_OtherLiabilities	356,423us-gaap_OtherLiabilities
Total liabilities	21,660,034us-gaap_Liabilities	20,857,639us-gaap_Liabilities
Commerce Bancshares, Inc. stockholders’ equity:
Preferred stock, $1 par value	144,784us-gaap_PreferredStockValueOutstanding	0us-gaap_PreferredStockValueOutstanding
Common stock, $5 par value	484,155us-gaap_CommonStockValue	481,224us-gaap_CommonStockValue
Capital surplus	1,229,075us-gaap_AdditionalPaidInCapital	1,279,948us-gaap_AdditionalPaidInCapital
Retained earnings	426,648	449,836
Treasury stock of 367,487 and 235,986 shares in 2014 and 2013, respectively, at cost	(16,562)us-gaap_TreasuryStockValue	(10,097)us-gaap_TreasuryStockValue
Accumulated other comprehensive income	62,093	9,731
Total Commerce Bancshares, Inc. stockholders’ equity	2,330,193us-gaap_StockholdersEquity	2,210,642us-gaap_StockholdersEquity
Non-controlling interest	4,053us-gaap_MinorityInterest	3,755us-gaap_MinorityInterest
Total equity	2,334,246	2,214,397
Total liabilities and equity	$ 23,994,280	$ 23,072,036

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Excess of issue price over par or stated value of the entity's capital stock and amounts received from other transactions involving the entity's stock or stockholders. Includes adjustments to additional paid in capital. Some examples of such adjustments include recording the issuance of debt with a beneficial conversion feature and certain tax consequences of equity instruments awarded to employees. Use this element for the aggregate amount of additional paid-in capital associated with common and preferred stock. For additional paid-in capital associated with only common stock, use the element additional paid in capital, common stock. For additional paid-in capital associated with only preferred stock, use the element additional paid in capital, preferred stock.

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Value of all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by shareholders, which is net of related treasury stock. May be all or a portion of the number of preferred shares authorized. These shares represent the ownership interest of the preferred shareholders.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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-Name Regulation S-X (SX)

-Number 210

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The cumulative amount of the reporting entity's undistributed earnings or deficit.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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-Paragraph 29, 30, 31

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Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity.

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The aggregate amount of domestic time deposits (including certificates of deposits, individual retirement accounts and open accounts) in denominations of $100,000 or more.

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The aggregate amount of domestic or foreign time deposits (including certificates of deposits, individual retirement accounts and open accounts) that total to less than $100,000.

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Amount of investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading.

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-Glossary Trading Securities

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The amount allocated to treasury stock. Treasury stock is common and preferred shares of an entity that were issued, repurchased by the entity, and are held in its treasury.

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-Topic 505

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