$CBSH
COMMERCE BANCSHARES INC /MO/ Stock $cbsh

$cbsh Overview Financials Valuation SEC Filings Company Website

2024 Q1 Form 10-K Financial Statement

#000002235624000013 Filed on February 22, 2024

Income Statement

Concept	2024 Q1	2023 Q4	2023
Revenue	$0.00		$1.381B
YoY Change			38.27%
Cost Of Revenue
YoY Change
Gross Profit
YoY Change
Gross Profit Margin
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$13.27M	$12.81M	$36.10M
YoY Change	14.73%	11.36%	11.76%
% of Gross Profit
Operating Expenses
YoY Change
Operating Profit
YoY Change
Interest Expense	$109.7M		$383.2M
YoY Change	91.71%		574.65%
% of Operating Profit
Other Income/Expense, Net
YoY Change
Pretax Income	$147.1M	$143.8M	$619.7M
YoY Change	-4.08%	-14.5%	-2.0%
Income Tax	$31.65M	$32.31M	$134.5M
% Of Pretax Income	21.52%	22.47%	21.71%
Net Earnings	$112.7M	$108.2M	$477.1M
YoY Change	-5.68%	-17.01%	-2.32%
Net Earnings / Revenue			34.54%
Basic Earnings Per Share	$0.87		$3.64
Diluted Earnings Per Share	$0.86	$0.83	$3.64
COMMON SHARES
Basic Shares Outstanding	129.9M shares	124.3M shares
Diluted Shares Outstanding

Balance Sheet

Concept	2024 Q1	2023 Q4	2023
SHORT-TERM ASSETS
Cash & Short-Term Investments
YoY Change
Cash & Equivalents	$1.901B	$2.687B
Short-Term Investments
Other Short-Term Assets
YoY Change
Inventory
Prepaid Expenses
Receivables
Other Receivables
Total Short-Term Assets
YoY Change
LONG-TERM ASSETS
Property, Plant & Equipment	$467.4M	$469.1M	$469.1M
YoY Change	9.16%	11.97%	11.97%
Goodwill	$146.5M	$146.5M
YoY Change	5.48%	5.48%
Intangibles	$13.92M	$14.18M
YoY Change	-6.7%	-6.93%
Long-Term Investments		$0.00
YoY Change		-100.0%
Other Assets
YoY Change
Total Long-Term Assets
YoY Change
TOTAL ASSETS
Total Short-Term Assets
Total Long-Term Assets
Total Assets	$30.37B	$31.70B	$31.70B
YoY Change	-5.1%	-0.55%	-0.55%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable
YoY Change
Accrued Expenses			$24.90M
YoY Change			-1.19%
Deferred Revenue
YoY Change
Short-Term Debt	$2.506B	$2.909B	$2.909B
YoY Change	-10.02%	2.36%	2.36%
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$2.506B	$2.909B	$2.934B
YoY Change	-10.02%	2.36%	11541.73%
LONG-TERM LIABILITIES
Long-Term Debt	$2.359M	$1.404M	$1.404M
YoY Change	-99.84%	-85.48%	-85.48%
Other Long-Term Liabilities	$460.1M	$462.7M	$437.8M
YoY Change	32.72%	30.16%	32.55%
Total Long-Term Liabilities	$462.4M	$464.1M	$439.2M
YoY Change	-75.06%	27.09%	29.19%
TOTAL LIABILITIES
Total Short-Term Liabilities	$2.506B	$2.909B	$2.934B
Total Long-Term Liabilities	$462.4M	$464.1M	$439.2M
Total Liabilities	$27.41B	$28.74B	$28.76B
YoY Change	-6.53%	-2.24%	-2.22%
SHAREHOLDERS EQUITY
Retained Earnings	$130.7M	$53.18M
YoY Change	11.42%	68.19%
Common Stock	$655.3M	$655.3M
YoY Change	4.13%	4.13%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$59.67M	$35.60M
YoY Change	0.01%	-14.72%
Treasury Stock Shares
Shareholders Equity	$2.944B	$2.944B	$2.944B
YoY Change
Total Liabilities & Shareholders Equity	$30.37B	$31.70B	$31.70B
YoY Change	-5.1%	-0.55%	-0.55%

Cashflow Statement

Concept	2024 Q1	2023 Q4	2023
OPERATING ACTIVITIES
Net Income	$112.7M	$108.2M	$477.1M
YoY Change	-5.68%	-17.01%	-2.32%
Depreciation, Depletion And Amortization	$13.27M	$12.81M	$36.10M
YoY Change	14.73%	11.36%	11.76%
Cash From Operating Activities	$135.5M	$121.1M	$488.8M
YoY Change	16.73%	35.12%	-12.62%
INVESTING ACTIVITIES
Capital Expenditures	$11.00M	$15.47M	$88.07M
YoY Change	-45.13%	-16.6%	35.1%
Acquisitions			$6.365M
YoY Change
Other Investing Activities	$551.9M	$481.0M	$2.272B
YoY Change	-39.24%	-5.31%	638.92%
Cash From Investing Activities	$540.9M	$465.4M	$2.184B
YoY Change	-39.1%	-4.9%	801.4%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net			$76.37M
YoY Change			-59.08%
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-$1.463B	-107.7M	-$883.1M
YoY Change	703.95%	-84.4%	-78.98%
NET CHANGE
Cash From Operating Activities	$135.5M	121.1M	$488.8M
Cash From Investing Activities	$540.9M	465.4M	$2.184B
Cash From Financing Activities	-$1.463B	-107.7M	-$883.1M
Net Change In Cash	-$786.6M	478.8M	$1.789B
YoY Change	-195.65%	-530.27%	-152.64%
FREE CASH FLOW
Cash From Operating Activities	$135.5M	$121.1M	$488.8M
Capital Expenditures	$11.00M	$15.47M	$88.07M
Free Cash Flow	$124.5M	$105.6M	$400.7M
YoY Change	29.65%	48.63%	-18.92%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2023Q4	cbsh	Financing Receivable Allowance For Credit Loss And Unfunded Lending Commitments Total FinancingReceivableAllowanceForCreditLossAndUnfundedLendingCommitmentsTotal	187641000	usd
CY2023	dei	Entity Central Index Key EntityCentralIndexKey	0000022356
CY2023	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2023	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2023
CY2023	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2023	dei	Amendment Flag AmendmentFlag	false
CY2022	us-gaap	Impairment Of Intangible Asset Finite Lived Statement Of Income Or Comprehensive Income Extensible Enumeration ImpairmentOfIntangibleAssetFiniteLivedStatementOfIncomeOrComprehensiveIncomeExtensibleEnumeration	http://fasb.org/us-gaap/2023#IntangibleAssetsNetExcludingGoodwill
CY2023Q4	us-gaap	Operating Lease Right Of Use Asset Statement Of Financial Position Extensible List OperatingLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2023#PropertyPlantAndEquipmentNet
CY2022Q4	us-gaap	Operating Lease Right Of Use Asset Statement Of Financial Position Extensible List OperatingLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2023#PropertyPlantAndEquipmentNet
CY2023Q4	us-gaap	Operating Lease Liability Statement Of Financial Position Extensible List OperatingLeaseLiabilityStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2023#OtherLiabilities
CY2022Q4	us-gaap	Operating Lease Liability Statement Of Financial Position Extensible List OperatingLeaseLiabilityStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2023#OtherLiabilities
CY2023	us-gaap	Operating Lease Income Comprehensive Income Extensible List OperatingLeaseIncomeComprehensiveIncomeExtensibleList	http://fasb.org/us-gaap/2023#NoninterestIncomeOtherOperatingIncome
CY2023	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost Credit Interest Cost Statement Of Income Or Comprehensive Income Extensible List DefinedBenefitPlanNetPeriodicBenefitCostCreditInterestCostStatementOfIncomeOrComprehensiveIncomeExtensibleList	http://fasb.org/us-gaap/2023#LaborAndRelatedExpense
CY2023	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost Credit Expected Return Loss Statement Of Income Or Comprehensive Income Extensible List DefinedBenefitPlanNetPeriodicBenefitCostCreditExpectedReturnLossStatementOfIncomeOrComprehensiveIncomeExtensibleList	http://fasb.org/us-gaap/2023#LaborAndRelatedExpense
CY2023	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost Credit Amortization Of Prior Service Cost Credit Statement Of Income Or Comprehensive Income Extensible List DefinedBenefitPlanNetPeriodicBenefitCostCreditAmortizationOfPriorServiceCostCreditStatementOfIncomeOrComprehensiveIncomeExtensibleList	http://fasb.org/us-gaap/2023#LaborAndRelatedExpense
CY2023	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost Credit Amortization Of Gain Loss Statement Of Income Or Comprehensive Income Extensible List DefinedBenefitPlanNetPeriodicBenefitCostCreditAmortizationOfGainLossStatementOfIncomeOrComprehensiveIncomeExtensibleList	http://fasb.org/us-gaap/2023#LaborAndRelatedExpense
CY2023	us-gaap	Fair Value Recurring Basis Unobservable Input Reconciliation Asset Gain Loss Statement Of Income Extensible List FairValueRecurringBasisUnobservableInputReconciliationAssetGainLossStatementOfIncomeExtensibleList	http://fasb.org/us-gaap/2023#GainLossOnInvestments
CY2023	us-gaap	Fair Value Recurring Basis Unobservable Input Reconciliation Asset Gain Loss Statement Of Other Comprehensive Income Extensible List FairValueRecurringBasisUnobservableInputReconciliationAssetGainLossStatementOfOtherComprehensiveIncomeExtensibleList	http://fasb.org/us-gaap/2023#OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
CY2022	cbsh	Investment Securities Called InvestmentSecuritiesCalled	0	usd
CY2023Q4	cbsh	Mortgage Servicing Rights Nonrecurring Basis MortgageServicingRightsNonrecurringBasis	0	usd
CY2023	cbsh	Mortgage Servicing Rights Nonrecurring Basis Gains Losses MortgageServicingRightsNonrecurringBasisGainsLosses	0	usd
CY2023Q4	us-gaap	Derivative Liability Statement Of Financial Position Extensible Enumeration DerivativeLiabilityStatementOfFinancialPositionExtensibleEnumeration	http://fasb.org/us-gaap/2023#OtherLiabilities
CY2023Q4	us-gaap	Derivative Asset Statement Of Financial Position Extensible Enumeration DerivativeAssetStatementOfFinancialPositionExtensibleEnumeration	http://fasb.org/us-gaap/2023#OtherAssets
CY2023	us-gaap	Derivative Instrument Gain Loss Reclassified From Aoci Into Income Effective Portion Statement Of Income Or Comprehensive Income Extensible Enumeration DerivativeInstrumentGainLossReclassifiedFromAociIntoIncomeEffectivePortionStatementOfIncomeOrComprehensiveIncomeExtensibleEnumeration	http://fasb.org/us-gaap/2023#InterestAndFeeIncomeLoansAndLeasesHeldInPortfolio
CY2022	us-gaap	Derivative Instrument Gain Loss Reclassified From Aoci Into Income Effective Portion Statement Of Income Or Comprehensive Income Extensible Enumeration DerivativeInstrumentGainLossReclassifiedFromAociIntoIncomeEffectivePortionStatementOfIncomeOrComprehensiveIncomeExtensibleEnumeration	http://fasb.org/us-gaap/2023#InterestAndFeeIncomeLoansAndLeasesHeldInPortfolio
CY2021	us-gaap	Derivative Instrument Gain Loss Reclassified From Aoci Into Income Effective Portion Statement Of Income Or Comprehensive Income Extensible Enumeration DerivativeInstrumentGainLossReclassifiedFromAociIntoIncomeEffectivePortionStatementOfIncomeOrComprehensiveIncomeExtensibleEnumeration	http://fasb.org/us-gaap/2023#InterestAndFeeIncomeLoansAndLeasesHeldInPortfolio
CY2023	dei	Document Annual Report DocumentAnnualReport	true
CY2023	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2023	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2023	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2023	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2023	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2023	dei	Entity Small Business EntitySmallBusiness	false
CY2023	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2023	dei	Icfr Auditor Attestation Flag IcfrAuditorAttestationFlag	true
CY2023	dei	Document Fin Stmt Error Correction Flag DocumentFinStmtErrorCorrectionFlag	false
CY2023	dei	Entity Shell Company EntityShellCompany	false
CY2023Q2	dei	Entity Public Float EntityPublicFloat	5672000000	usd
CY2024Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	129877146	shares
CY2023Q4	us-gaap	Loans And Leases Receivable Net Of Deferred Income LoansAndLeasesReceivableNetOfDeferredIncome	17205479000	usd
CY2022Q4	us-gaap	Loans And Leases Receivable Net Of Deferred Income LoansAndLeasesReceivableNetOfDeferredIncome	16303131000	usd
CY2023Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	162395000	usd
CY2022Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	150136000	usd
CY2023Q4	us-gaap	Loans And Leases Receivable Net Reported Amount LoansAndLeasesReceivableNetReportedAmount	17043084000	usd
CY2022Q4	us-gaap	Loans And Leases Receivable Net Reported Amount LoansAndLeasesReceivableNetReportedAmount	16152995000	usd
CY2023Q4	us-gaap	Mortgages Held For Sale Fair Value Disclosure MortgagesHeldForSaleFairValueDisclosure	1585000	usd
CY2022Q4	us-gaap	Mortgages Held For Sale Fair Value Disclosure MortgagesHeldForSaleFairValueDisclosure	0	usd
CY2023Q4	us-gaap	Loans Receivable Held For Sale Amount LoansReceivableHeldForSaleAmount	4177000	usd
CY2022Q4	us-gaap	Loans Receivable Held For Sale Amount LoansReceivableHeldForSaleAmount	4964000	usd
CY2023Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	10904765000	usd
CY2022Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	13738206000	usd
CY2022Q4	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss DebtSecuritiesAvailableForSaleAllowanceForCreditLoss	0	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss DebtSecuritiesAvailableForSaleAllowanceForCreditLoss	0	usd
CY2023Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	9684760000	usd
CY2022Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	12238316000	usd
CY2023Q4	us-gaap	Trading Securities Debt TradingSecuritiesDebt	28830000	usd
CY2022Q4	us-gaap	Trading Securities Debt TradingSecuritiesDebt	43523000	usd
CY2023Q4	us-gaap	Equity Securities Fv Ni And Without Readily Determinable Fair Value EquitySecuritiesFvNiAndWithoutReadilyDeterminableFairValue	12701000	usd
CY2022Q4	us-gaap	Equity Securities Fv Ni And Without Readily Determinable Fair Value EquitySecuritiesFvNiAndWithoutReadilyDeterminableFairValue	12304000	usd
CY2023Q4	us-gaap	Other Investments OtherInvestments	222473000	usd
CY2022Q4	us-gaap	Other Investments OtherInvestments	225034000	usd
CY2023Q4	us-gaap	Investments Investments	9948764000	usd
CY2022Q4	us-gaap	Investments Investments	12519177000	usd
CY2023Q4	us-gaap	Federal Funds Sold FederalFundsSold	5025000	usd
CY2022Q4	us-gaap	Federal Funds Sold FederalFundsSold	49505000	usd
CY2023Q4	us-gaap	Securities Purchased Under Agreements To Resell SecuritiesPurchasedUnderAgreementsToResell	450000000	usd
CY2022Q4	us-gaap	Securities Purchased Under Agreements To Resell SecuritiesPurchasedUnderAgreementsToResell	825000000	usd
CY2023Q4	us-gaap	Interest Bearing Deposits In Banks InterestBearingDepositsInBanks	2239010000	usd
CY2022Q4	us-gaap	Interest Bearing Deposits In Banks InterestBearingDepositsInBanks	389140000	usd
CY2023Q4	us-gaap	Cash And Due From Banks CashAndDueFromBanks	443147000	usd
CY2022Q4	us-gaap	Cash And Due From Banks CashAndDueFromBanks	452496000	usd
CY2023Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	469059000	usd
CY2022Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	418909000	usd
CY2023Q4	us-gaap	Goodwill Goodwill	146539000	usd
CY2022Q4	us-gaap	Goodwill Goodwill	138921000	usd
CY2023Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	14179000	usd
CY2022Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	15234000	usd
CY2023Q4	us-gaap	Other Assets OtherAssets	938077000	usd
CY2022Q4	us-gaap	Other Assets OtherAssets	909590000	usd
CY2023Q4	us-gaap	Assets Assets	31701061000	usd
CY2022Q4	us-gaap	Assets Assets	31875931000	usd
CY2023Q4	us-gaap	Noninterest Bearing Deposit Liabilities NoninterestBearingDepositLiabilities	7975935000	usd
CY2022Q4	us-gaap	Noninterest Bearing Deposit Liabilities NoninterestBearingDepositLiabilities	10066356000	usd
CY2023Q4	us-gaap	Interest Bearing Deposit Liabilities InterestBearingDepositLiabilities	14512273000	usd
CY2022Q4	us-gaap	Interest Bearing Deposit Liabilities InterestBearingDepositLiabilities	15126981000	usd
CY2023Q4	us-gaap	Time Deposits Less Than100000 TimeDepositsLessThan100000	930432000	usd
CY2022Q4	us-gaap	Time Deposits Less Than100000 TimeDepositsLessThan100000	387336000	usd
CY2023Q4	us-gaap	Time Deposits100000 Or More TimeDeposits100000OrMore	1945258000	usd
CY2022Q4	us-gaap	Time Deposits100000 Or More TimeDeposits100000OrMore	606767000	usd
CY2023Q4	us-gaap	Deposits Deposits	25363898000	usd
CY2022Q4	us-gaap	Deposits Deposits	26187440000	usd
CY2023Q4	us-gaap	Federal Funds Purchased And Securities Sold Under Agreements To Repurchase FederalFundsPurchasedAndSecuritiesSoldUnderAgreementsToRepurchase	2908815000	usd
CY2022Q4	us-gaap	Federal Funds Purchased And Securities Sold Under Agreements To Repurchase FederalFundsPurchasedAndSecuritiesSoldUnderAgreementsToRepurchase	2841734000	usd
CY2023Q4	us-gaap	Other Borrowings OtherBorrowings	1404000	usd
CY2022Q4	us-gaap	Other Borrowings OtherBorrowings	9672000	usd
CY2023Q4	us-gaap	Other Liabilities OtherLiabilities	462714000	usd
CY2022Q4	us-gaap	Other Liabilities OtherLiabilities	355508000	usd
CY2023Q4	us-gaap	Liabilities Liabilities	28736831000	usd
CY2022Q4	us-gaap	Liabilities Liabilities	29394354000	usd
CY2023Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	5
CY2022Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	5
CY2023Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	190000000	shares
CY2022Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	140000000	shares
CY2023Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	131064418	shares
CY2022Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	125863879	shares
CY2023Q4	us-gaap	Common Stock Value CommonStockValue	655322000	usd
CY2022Q4	us-gaap	Common Stock Value CommonStockValue	629319000	usd
CY2023Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	3162622000	usd
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CY2022Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	31620000	usd
CY2023Q4	us-gaap	Treasury Stock Common Shares TreasuryStockCommonShares	611546	shares
CY2022Q4	us-gaap	Treasury Stock Common Shares TreasuryStockCommonShares	605142	shares
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CY2022Q4	us-gaap	Treasury Stock Value TreasuryStockValue	41743000	usd
CY2023Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-891412000	usd
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CY2023Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	31701061000	usd
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CY2022	us-gaap	Interest And Fee Income Loans And Leases Held In Portfolio InterestAndFeeIncomeLoansAndLeasesHeldInPortfolio	646293000	usd
CY2021	us-gaap	Interest And Fee Income Loans And Leases Held In Portfolio InterestAndFeeIncomeLoansAndLeasesHeldInPortfolio	570549000	usd
CY2023	us-gaap	Interest And Fee Income Loans And Leases Held For Sale InterestAndFeeIncomeLoansAndLeasesHeldForSale	583000	usd
CY2022	us-gaap	Interest And Fee Income Loans And Leases Held For Sale InterestAndFeeIncomeLoansAndLeasesHeldForSale	637000	usd
CY2021	us-gaap	Interest And Fee Income Loans And Leases Held For Sale InterestAndFeeIncomeLoansAndLeasesHeldForSale	880000	usd
CY2023	us-gaap	Interest And Dividend Income Securities InterestAndDividendIncomeSecurities	278755000	usd
CY2022	us-gaap	Interest And Dividend Income Securities InterestAndDividendIncomeSecurities	313892000	usd
CY2021	us-gaap	Interest And Dividend Income Securities InterestAndDividendIncomeSecurities	236278000	usd
CY2022	us-gaap	Interest Income Federal Funds Sold InterestIncomeFederalFundsSold	412000	usd
CY2021	us-gaap	Interest Income Federal Funds Sold InterestIncomeFederalFundsSold	4000	usd
CY2021	us-gaap	Interest Income Securities Purchased Under Agreements To Resell InterestIncomeSecuritiesPurchasedUnderAgreementsToResell	37377000	usd
CY2023	us-gaap	Interest Expense Now Accounts Money Market Accounts And Savings Deposits InterestExpenseNOWAccountsMoneyMarketAccountsAndSavingsDeposits	146392000	usd
CY2023	us-gaap	Interest Expense Time Deposits Less Than100000 InterestExpenseTimeDepositsLessThan100000	38690000	usd
CY2022	us-gaap	Interest Expense Time Deposits Less Than100000 InterestExpenseTimeDepositsLessThan100000	1469000	usd
CY2023	us-gaap	Interest Expense Time Deposits100000 Or More InterestExpenseTimeDeposits100000OrMore	61057000	usd
CY2022	us-gaap	Interest Expense Time Deposits100000 Or More InterestExpenseTimeDeposits100000OrMore	3898000	usd
CY2021	us-gaap	Interest Expense Time Deposits100000 Or More InterestExpenseTimeDeposits100000OrMore	2577000	usd
CY2023	us-gaap	Interest Expense Federal Funds Purchased InterestExpenseFederalFundsPurchased	25265000	usd
CY2022	us-gaap	Interest Expense Federal Funds Purchased InterestExpenseFederalFundsPurchased	1836000	usd
CY2021	us-gaap	Interest Expense Federal Funds Purchased InterestExpenseFederalFundsPurchased	16000	usd
CY2023	us-gaap	Interest Expense Securities Sold Under Agreements To Repurchase InterestExpenseSecuritiesSoldUnderAgreementsToRepurchase	73164000	usd
CY2022	us-gaap	Interest Expense Securities Sold Under Agreements To Repurchase InterestExpenseSecuritiesSoldUnderAgreementsToRepurchase	24022000	usd
CY2021	us-gaap	Interest Expense Securities Sold Under Agreements To Repurchase InterestExpenseSecuritiesSoldUnderAgreementsToRepurchase	1630000	usd
CY2023	cbsh	Interest On Other Borrowings InterestOnOtherBorrowings	38594000	usd
CY2022	cbsh	Interest On Other Borrowings InterestOnOtherBorrowings	470000	usd
CY2021	cbsh	Interest On Other Borrowings InterestOnOtherBorrowings	-24000	usd
CY2023	us-gaap	Interest Expense InterestExpense	383162000	usd
CY2022	us-gaap	Interest Expense InterestExpense	56794000	usd
CY2021	us-gaap	Interest Expense InterestExpense	12866000	usd
CY2023	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	998129000	usd
CY2022	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	942185000	usd
CY2021	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	835424000	usd
CY2023	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	35451000	usd
CY2022	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	28071000	usd
CY2021	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	-66326000	usd
CY2023	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	962678000	usd
CY2022	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	914114000	usd
CY2021	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	901750000	usd
CY2023	cbsh	Bank Card Transaction Fees BankCardTransactionFees	191156000	usd
CY2022	cbsh	Bank Card Transaction Fees BankCardTransactionFees	176144000	usd
CY2021	cbsh	Bank Card Transaction Fees BankCardTransactionFees	167891000	usd
CY2023	cbsh	Trustfeerevenue Trustfeerevenue	190954000	usd
CY2022	cbsh	Trustfeerevenue Trustfeerevenue	184719000	usd
CY2021	cbsh	Trustfeerevenue Trustfeerevenue	188227000	usd
CY2023	cbsh	Depositfeerevenue Depositfeerevenue	90992000	usd
CY2022	cbsh	Depositfeerevenue Depositfeerevenue	94381000	usd
CY2021	cbsh	Depositfeerevenue Depositfeerevenue	97217000	usd
CY2023	us-gaap	Brokerage Commissions Revenue BrokerageCommissionsRevenue	17223000	usd
CY2022	us-gaap	Brokerage Commissions Revenue BrokerageCommissionsRevenue	19117000	usd
CY2021	us-gaap	Brokerage Commissions Revenue BrokerageCommissionsRevenue	18362000	usd
CY2023	us-gaap	Noninterest Income Other NoninterestIncomeOther	14100000	usd
CY2022	us-gaap	Noninterest Income Other NoninterestIncomeOther	14231000	usd
CY2021	us-gaap	Noninterest Income Other NoninterestIncomeOther	15943000	usd
CY2023	cbsh	Loan Fees And Sales LoanFeesAndSales	11165000	usd
CY2022	cbsh	Loan Fees And Sales LoanFeesAndSales	13141000	usd
CY2021	cbsh	Loan Fees And Sales LoanFeesAndSales	29720000	usd
CY2023	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	57455000	usd
CY2022	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	44802000	usd
CY2021	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	43033000	usd
CY2023	us-gaap	Noninterest Income NoninterestIncome	573045000	usd
CY2022	us-gaap	Noninterest Income NoninterestIncome	546535000	usd
CY2021	us-gaap	Noninterest Income NoninterestIncome	560393000	usd
CY2023	us-gaap	Gain Loss On Investments GainLossOnInvestments	14985000	usd
CY2022	us-gaap	Gain Loss On Investments GainLossOnInvestments	20506000	usd
CY2021	us-gaap	Gain Loss On Investments GainLossOnInvestments	30059000	usd
CY2023	us-gaap	Labor And Related Expense LaborAndRelatedExpense	584063000	usd
CY2022	us-gaap	Labor And Related Expense LaborAndRelatedExpense	554047000	usd
CY2021	us-gaap	Labor And Related Expense LaborAndRelatedExpense	525248000	usd
CY2023	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	118758000	usd
CY2022	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	110692000	usd
CY2021	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	101792000	usd
CY2023	us-gaap	Occupancy Net OccupancyNet	53629000	usd
CY2022	us-gaap	Occupancy Net OccupancyNet	49117000	usd
CY2021	us-gaap	Occupancy Net OccupancyNet	48185000	usd
CY2023	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	33163000	usd
CY2022	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	10583000	usd
CY2021	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	9094000	usd
CY2023	us-gaap	Marketing Expense MarketingExpense	24511000	usd
CY2022	us-gaap	Marketing Expense MarketingExpense	23827000	usd
CY2021	us-gaap	Marketing Expense MarketingExpense	21856000	usd
CY2023	us-gaap	Equipment Expense EquipmentExpense	19548000	usd
CY2022	us-gaap	Equipment Expense EquipmentExpense	19359000	usd
CY2021	us-gaap	Equipment Expense EquipmentExpense	18089000	usd
CY2023	cbsh	Supplies Postage And Communication SuppliesPostageAndCommunication	19420000	usd
CY2022	cbsh	Supplies Postage And Communication SuppliesPostageAndCommunication	18101000	usd
CY2021	cbsh	Supplies Postage And Communication SuppliesPostageAndCommunication	17118000	usd
CY2023	us-gaap	Other Noninterest Expense OtherNoninterestExpense	77890000	usd
CY2022	us-gaap	Other Noninterest Expense OtherNoninterestExpense	63051000	usd
CY2021	us-gaap	Other Noninterest Expense OtherNoninterestExpense	64519000	usd
CY2023	us-gaap	Noninterest Expense NoninterestExpense	930982000	usd
CY2022	us-gaap	Noninterest Expense NoninterestExpense	848777000	usd
CY2021	us-gaap	Noninterest Expense NoninterestExpense	805901000	usd
CY2023	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	619726000	usd
CY2022	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	632378000	usd
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	686301000	usd
CY2023	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	134549000	usd
CY2022	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	132358000	usd
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	145711000	usd
CY2023	us-gaap	Profit Loss ProfitLoss	485177000	usd
CY2022	us-gaap	Profit Loss ProfitLoss	500020000	usd
CY2021	us-gaap	Profit Loss ProfitLoss	540590000	usd
CY2023	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	8117000	usd
CY2022	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	11621000	usd
CY2021	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	9825000	usd
CY2023	us-gaap	Net Income Loss NetIncomeLoss	477060000	usd
CY2022	us-gaap	Net Income Loss NetIncomeLoss	488399000	usd
CY2021	us-gaap	Net Income Loss NetIncomeLoss	530765000	usd
CY2023	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.64
CY2022	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.68
CY2021	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.92
CY2023	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.64
CY2022	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.67
CY2021	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.91
CY2023	us-gaap	Profit Loss ProfitLoss	485177000	usd
CY2022	us-gaap	Profit Loss ProfitLoss	500020000	usd
CY2021	us-gaap	Profit Loss ProfitLoss	540590000	usd
CY2023	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	209914000	usd
CY2022	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-1148089000	usd
CY2021	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-240627000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-3590000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-3482000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-4450000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax	-18052000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax	-19337000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax	-18120000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	195452000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-1163944000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-254297000	usd
CY2023	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	680629000	usd
CY2022	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	-663924000	usd
CY2021	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	286293000	usd
CY2023	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	8117000	usd
CY2022	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	11621000	usd
CY2021	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	9825000	usd
CY2023	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	672512000	usd
CY2022	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-675545000	usd
CY2021	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	276468000	usd
CY2020Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	3399972000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-254297000	usd
CY2021	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	1065000	usd
CY2021	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	129361000	usd
CY2021	us-gaap	Noncontrolling Interest Increase From Sale Of Parent Equity Interest NoncontrollingInterestIncreaseFromSaleOfParentEquityInterest	0	usd
CY2021	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.907
CY2021	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	122693000	usd
CY2021	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	15415000	usd
CY2021	cbsh	Stock Issued During Period Rs Asand Sa Rs StockIssuedDuringPeriodRSAsandSARs	911000	usd
CY2021	cbsh	Stock Dividend Rate StockDividendRate	0.05
CY2021	us-gaap	Dividends Common Stock Stock DividendsCommonStockStock	1148000	usd
CY2021Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	3448324000	usd
CY2022	us-gaap	Profit Loss ProfitLoss	500020000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-1163944000	usd
CY2022	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	6361000	usd
CY2022	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	186622000	usd
CY2022	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.961
CY2022	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	127466000	usd
CY2022	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	16995000	usd
CY2022	cbsh	Stock Issued During Period Rs Asand Sa Rs StockIssuedDuringPeriodRSAsandSARs	1905000	usd
CY2022	cbsh	Stock Dividend Rate StockDividendRate	0.05
CY2022	us-gaap	Dividends Common Stock Stock DividendsCommonStockStock	1274000	usd
CY2022Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	2481577000	usd
CY2023	us-gaap	Profit Loss ProfitLoss	485177000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	195452000	usd
CY2023	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	4235000	usd
CY2023	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	76890000	usd
CY2023	us-gaap	Noncontrolling Interest Increase From Sale Of Parent Equity Interest NoncontrollingInterestIncreaseFromSaleOfParentEquityInterest	0	usd
CY2023	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	1.029
CY2023	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	134734000	usd
CY2023	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	17052000	usd
CY2023	cbsh	Stock Issued During Period Rs Asand Sa Rs StockIssuedDuringPeriodRSAsandSARs	1707000	usd
CY2023	cbsh	Stock Dividend Rate StockDividendRate	0.05
CY2023	us-gaap	Dividends Common Stock Stock DividendsCommonStockStock	876000	usd
CY2023Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	2964230000	usd
CY2023	us-gaap	Profit Loss ProfitLoss	485177000	usd
CY2022	us-gaap	Profit Loss ProfitLoss	500020000	usd
CY2021	us-gaap	Profit Loss ProfitLoss	540590000	usd
CY2023	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	35451000	usd
CY2022	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	28071000	usd
CY2021	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	-66326000	usd
CY2023	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	49513000	usd
CY2022	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	46856000	usd
CY2021	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	44866000	usd
CY2023	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	-17666000	usd
CY2022	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	-18805000	usd
CY2021	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	-66934000	usd
CY2023	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-7399000	usd
CY2022	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	21716000	usd
CY2021	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	25613000	usd
CY2023	us-gaap	Gain Loss On Investments GainLossOnInvestments	14985000	usd
CY2022	us-gaap	Gain Loss On Investments GainLossOnInvestments	20506000	usd
CY2021	us-gaap	Gain Loss On Investments GainLossOnInvestments	30059000	usd
CY2023	us-gaap	Gain Loss On Sale Of Loans And Leases GainLossOnSaleOfLoansAndLeases	1026000	usd
CY2022	us-gaap	Gain Loss On Sale Of Loans And Leases GainLossOnSaleOfLoansAndLeases	2660000	usd
CY2021	us-gaap	Gain Loss On Sale Of Loans And Leases GainLossOnSaleOfLoansAndLeases	22641000	usd
CY2023	us-gaap	Proceeds From Sale Of Loans Held For Sale ProceedsFromSaleOfLoansHeldForSale	58946000	usd
CY2022	us-gaap	Proceeds From Sale Of Loans Held For Sale ProceedsFromSaleOfLoansHeldForSale	123656000	usd
CY2021	us-gaap	Proceeds From Sale Of Loans Held For Sale ProceedsFromSaleOfLoansHeldForSale	576864000	usd
CY2023	cbsh	Origination Of Loans Held For Sale OriginationOfLoansHeldForSale	57424000	usd
CY2022	cbsh	Origination Of Loans Held For Sale OriginationOfLoansHeldForSale	118850000	usd
CY2021	cbsh	Origination Of Loans Held For Sale OriginationOfLoansHeldForSale	524597000	usd
CY2023	us-gaap	Increase Decrease In Trading Securities IncreaseDecreaseInTradingSecurities	-28478000	usd
CY2022	us-gaap	Increase Decrease In Trading Securities IncreaseDecreaseInTradingSecurities	-4152000	usd
CY2021	us-gaap	Increase Decrease In Trading Securities IncreaseDecreaseInTradingSecurities	29885000	usd
CY2023	cbsh	Purchase Of Interest Rate Floor PurchaseOfInterestRateFloor	-54449000	usd
CY2022	cbsh	Purchase Of Interest Rate Floor PurchaseOfInterestRateFloor	-35799000	usd
CY2021	cbsh	Purchase Of Interest Rate Floor PurchaseOfInterestRateFloor	0	usd
CY2023	us-gaap	Share Based Compensation ShareBasedCompensation	17052000	usd
CY2022	us-gaap	Share Based Compensation ShareBasedCompensation	16995000	usd
CY2021	us-gaap	Share Based Compensation ShareBasedCompensation	15415000	usd
CY2023	us-gaap	Increase Decrease In Interest And Dividends Receivable IncreaseDecreaseInInterestAndDividendsReceivable	5986000	usd
CY2022	us-gaap	Increase Decrease In Interest And Dividends Receivable IncreaseDecreaseInInterestAndDividendsReceivable	28439000	usd
CY2021	us-gaap	Increase Decrease In Interest And Dividends Receivable IncreaseDecreaseInInterestAndDividendsReceivable	-19788000	usd
CY2023	us-gaap	Increase Decrease In Interest Payable Net IncreaseDecreaseInInterestPayableNet	46650000	usd
CY2022	us-gaap	Increase Decrease In Interest Payable Net IncreaseDecreaseInInterestPayableNet	3054000	usd
CY2021	us-gaap	Increase Decrease In Interest Payable Net IncreaseDecreaseInInterestPayableNet	-3179000	usd
CY2023	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	4586000	usd
CY2022	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	-12936000	usd
CY2021	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	-5175000	usd
CY2023	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	113481000	usd
CY2022	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	-15250000	usd
CY2021	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	10486000	usd
CY2023	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	488769000	usd
CY2022	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	559385000	usd
CY2021	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	597722000	usd
CY2023	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	6365000	usd
CY2022	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	0	usd
CY2021	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	0	usd
CY2023	us-gaap	Proceeds From Equity Method Investment Dividends Or Distributions Return Of Capital ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital	1434000	usd
CY2022	us-gaap	Proceeds From Equity Method Investment Dividends Or Distributions Return Of Capital ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital	400000	usd
CY2021	us-gaap	Proceeds From Equity Method Investment Dividends Or Distributions Return Of Capital ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital	13540000	usd
CY2023	cbsh	Cash Proceeds From Sales Of Investment Securities CashProceedsFromSalesOfInvestmentSecurities	1141949000	usd
CY2022	cbsh	Cash Proceeds From Sales Of Investment Securities CashProceedsFromSalesOfInvestmentSecurities	106971000	usd
CY2021	cbsh	Cash Proceeds From Sales Of Investment Securities CashProceedsFromSalesOfInvestmentSecurities	80811000	usd
CY2023	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	1935552000	usd
CY2022	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	2691260000	usd
CY2021	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	3459106000	usd
CY2023	us-gaap	Payments To Acquire Investments PaymentsToAcquireInvestments	246286000	usd
CY2022	us-gaap	Payments To Acquire Investments PaymentsToAcquireInvestments	2147862000	usd
CY2021	us-gaap	Payments To Acquire Investments PaymentsToAcquireInvestments	5947891000	usd
CY2023	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	933736000	usd
CY2022	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	1146292000	usd
CY2021	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	-1134533000	usd
CY2023	us-gaap	Payments For Securities Purchased Under Agreements To Resell PaymentsForSecuritiesPurchasedUnderAgreementsToResell	0	usd
CY2022	us-gaap	Payments For Securities Purchased Under Agreements To Resell PaymentsForSecuritiesPurchasedUnderAgreementsToResell	200000000	usd
CY2021	us-gaap	Payments For Securities Purchased Under Agreements To Resell PaymentsForSecuritiesPurchasedUnderAgreementsToResell	900000000	usd
CY2023	us-gaap	Proceeds From Securities Purchased Under Agreements To Resell ProceedsFromSecuritiesPurchasedUnderAgreementsToResell	375000000	usd
CY2022	us-gaap	Proceeds From Securities Purchased Under Agreements To Resell ProceedsFromSecuritiesPurchasedUnderAgreementsToResell	1000000000	usd
CY2021	us-gaap	Proceeds From Securities Purchased Under Agreements To Resell ProceedsFromSecuritiesPurchasedUnderAgreementsToResell	125000000	usd
CY2023	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	88074000	usd
CY2022	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	65191000	usd
CY2021	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	56716000	usd
CY2023	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	4358000	usd
CY2022	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	2985000	usd
CY2021	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	8859000	usd
CY2023	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	2183832000	usd
CY2022	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	242271000	usd
CY2021	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-2082758000	usd
CY2023	cbsh	Net Increase Decrease Non Interest Bearing Savings Interest Checking And Money Market Deposits NetIncreaseDecreaseNonInterestBearingSavingsInterestCheckingAndMoneyMarketDeposits	-2612412000	usd
CY2022	cbsh	Net Increase Decrease Non Interest Bearing Savings Interest Checking And Money Market Deposits NetIncreaseDecreaseNonInterestBearingSavingsInterestCheckingAndMoneyMarketDeposits	-3254081000	usd
CY2021	cbsh	Net Increase Decrease Non Interest Bearing Savings Interest Checking And Money Market Deposits NetIncreaseDecreaseNonInterestBearingSavingsInterestCheckingAndMoneyMarketDeposits	3291466000	usd
CY2023	us-gaap	Increase Decrease In Time Deposits IncreaseDecreaseInTimeDeposits	1881587000	usd
CY2022	us-gaap	Increase Decrease In Time Deposits IncreaseDecreaseInTimeDeposits	-448511000	usd
CY2021	us-gaap	Increase Decrease In Time Deposits IncreaseDecreaseInTimeDeposits	-402077000	usd
CY2023	us-gaap	Increase Decrease In Federal Funds Purchased And Securities Sold Under Agreements To Repurchase Net IncreaseDecreaseInFederalFundsPurchasedAndSecuritiesSoldUnderAgreementsToRepurchaseNet	67081000	usd
CY2022	us-gaap	Increase Decrease In Federal Funds Purchased And Securities Sold Under Agreements To Repurchase Net IncreaseDecreaseInFederalFundsPurchasedAndSecuritiesSoldUnderAgreementsToRepurchaseNet	-181233000	usd
CY2021	us-gaap	Increase Decrease In Federal Funds Purchased And Securities Sold Under Agreements To Repurchase Net IncreaseDecreaseInFederalFundsPurchasedAndSecuritiesSoldUnderAgreementsToRepurchaseNet	924584000	usd
CY2023	us-gaap	Proceeds From Federal Home Loan Bank Borrowings ProceedsFromFederalHomeLoanBankBorrowings	2250000000	usd
CY2022	us-gaap	Proceeds From Federal Home Loan Bank Borrowings ProceedsFromFederalHomeLoanBankBorrowings	0	usd
CY2021	us-gaap	Proceeds From Federal Home Loan Bank Borrowings ProceedsFromFederalHomeLoanBankBorrowings	0	usd
CY2023	us-gaap	Repayments Of Federal Home Loan Bank Borrowings RepaymentsOfFederalHomeLoanBankBorrowings	2250000000	usd
CY2022	us-gaap	Repayments Of Federal Home Loan Bank Borrowings RepaymentsOfFederalHomeLoanBankBorrowings	0	usd
CY2021	us-gaap	Repayments Of Federal Home Loan Bank Borrowings RepaymentsOfFederalHomeLoanBankBorrowings	0	usd
CY2023	cbsh	Net Increase Decrease In Other Borrowings NetIncreaseDecreaseInOtherBorrowings	8268000	usd
CY2022	cbsh	Net Increase Decrease In Other Borrowings NetIncreaseDecreaseInOtherBorrowings	2888000	usd
CY2021	cbsh	Net Increase Decrease In Other Borrowings NetIncreaseDecreaseInOtherBorrowings	-11758000	usd
CY2023	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	76370000	usd
CY2022	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	186622000	usd
CY2021	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	129361000	usd
CY2023	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	134734000	usd
CY2022	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	127466000	usd
CY2021	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	122693000	usd
CY2023	cbsh	Other Changes In Financing Cash Flows Net OtherChangesInFinancingCashFlowsNet	3000	usd
CY2022	cbsh	Other Changes In Financing Cash Flows Net OtherChangesInFinancingCashFlowsNet	8000	usd
CY2021	cbsh	Other Changes In Financing Cash Flows Net OtherChangesInFinancingCashFlowsNet	15000	usd
CY2023	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-883119000	usd
CY2022	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-4200809000	usd
CY2021	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	3573662000	usd
CY2023	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	1789482000	usd
CY2022	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	-3399153000	usd
CY2021	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	2088626000	usd
CY2022Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	897801000	usd
CY2021Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	4296954000	usd
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	2208328000	usd
CY2023Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	2687283000	usd
CY2022Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	897801000	usd
CY2021Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	4296954000	usd
CY2023	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	130957000	usd
CY2022	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	116995000	usd
CY2021	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	119665000	usd
CY2023	us-gaap	Interest Paid Net InterestPaidNet	336512000	usd
CY2022	us-gaap	Interest Paid Net InterestPaidNet	53740000	usd
CY2021	us-gaap	Interest Paid Net InterestPaidNet	16045000	usd
CY2023	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	322000	usd
CY2022	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	457000	usd
CY2021	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	182000	usd
CY2023	cbsh	Delinquency Period Revolving Home Equity Loans Charged Down To Fair Value DelinquencyPeriodRevolvingHomeEquityLoansChargedDownToFairValue	P180D
CY2023	cbsh	Delinquency Period Credit Card Loans Charged Off DelinquencyPeriodCreditCardLoansChargedOff	P180D
CY2023	us-gaap	Nature Of Operations NatureOfOperations	<div style="margin-bottom:6pt;text-align:justify"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-style:italic;font-weight:400;line-height:120%">Nature of Operations</span></div><div style="text-align:justify;text-indent:13.5pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Commerce Bancshares, Inc. and its subsidiaries (the Company) conducts its principal activities from approximately 257 branch and ATM locations throughout Missouri, Kansas, Illinois, Oklahoma and Colorado. Principal activities include retail and commercial banking, investment management, securities brokerage, mortgage banking, trust, and private banking services. The Company also maintains offices in Dallas, Houston, Cincinnati, Nashville, Des Moines, Indianapolis, and Grand Rapids that support customers in its commercial and/or wealth segments and operates a commercial payments business with sales representatives covering the continental U.S.</span></div>
CY2023Q4	cbsh	Number Of Locations NumberOfLocations	257	locations
CY2023Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	101000	usd
CY2022Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	6700000	usd
CY2023Q4	cbsh	Cash Heldat Federal Reserve Bank CashHeldatFederalReserveBank	2200000000	usd
CY2023	cbsh	Amortization Period Of Credit Card Loan Annual Fees AmortizationPeriodOfCreditCardLoanAnnualFees	P12M
CY2023	cbsh	Period Past Due Loans Placed On Non Accrual PeriodPastDueLoansPlacedOnNonAccrual	P90D
CY2023	us-gaap	Financing Receivable Allowance For Credit Losses Policy For Uncollectible Amounts FinancingReceivableAllowanceForCreditLossesPolicyForUncollectibleAmounts	<div style="margin-bottom:6pt;text-align:justify"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-style:italic;font-weight:400;line-height:120%">Allowance for Credit Losses on Loans</span></div><div style="text-align:justify;text-indent:13.5pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">The allowance for credit losses on loans is a valuation amount that is deducted from the amortized cost basis of loans not held at fair value to present the net amount expected to be collected over the contractual term of the loans. The allowance for credit losses on loans is measured using relevant information about past events, including historical credit loss experience on loans with similar risk characteristics, current conditions, and reasonable and supportable forecasts that affect the collectability of the remaining cash flows over the contractual term of the loans. An allowance will be created upon origination or acquisition of a loan and is updated at subsequent reporting dates. The methodology is applied consistently for each reporting period and reflects management’s current expectations of credit losses. Changes to the allowance for credit losses on loans resulting from periodic evaluations are recorded through increases or decreases to the credit loss expense for loans, which is recorded in provision for credit losses on the consolidated statements of income. Loans that are deemed to be uncollectible are charged off against the related allowance for credit losses on loans. </span></div><div style="text-align:justify;text-indent:13.5pt"><span><br/></span></div><div style="text-align:justify;text-indent:13.5pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">The allowance for credit losses on loans is measured on a collective (pool) basis. Loans are aggregated into pools based on similar risk characteristics including borrower type, collateral type and expected credit loss patterns. Loans that do not share similar risk characteristics, primarily large loans on non-accrual status, are evaluated on an individual basis. The allowance related to these large non-accrual loans is generally measured using the fair value of the collateral (less selling cost, if applicable) as most of these loans are collateral dependent and the borrower is facing financial difficulty. </span></div><div style="text-align:justify;text-indent:13.5pt"><span><br/></span></div><div style="text-align:justify;text-indent:13.5pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">As noted above, the allowance for credit losses on loans does not include an allowance for accrued interest.</span></div>
CY2023	cbsh	Common Stock Dividend Rate Percentage CommonStockDividendRatePercentage	0.05
CY2023Q4	us-gaap	Loans And Leases Receivable Gross Carrying Amount LoansAndLeasesReceivableGrossCarryingAmount	17205479000	usd
CY2022Q4	us-gaap	Loans And Leases Receivable Gross Carrying Amount LoansAndLeasesReceivableGrossCarryingAmount	16303131000	usd
CY2023Q4	us-gaap	Interest Receivable InterestReceivable	71900000	usd
CY2022Q4	us-gaap	Interest Receivable InterestReceivable	55500000	usd
CY2022Q4	us-gaap	Loans And Leases Receivable Related Parties LoansAndLeasesReceivableRelatedParties	41107000	usd
CY2023	us-gaap	Loans And Leases Receivable Related Parties Additions LoansAndLeasesReceivableRelatedPartiesAdditions	2300000	usd
CY2023	us-gaap	Loans And Leases Receivable Related Parties Proceeds LoansAndLeasesReceivableRelatedPartiesProceeds	4605000	usd
CY2023	cbsh	Loans And Lease Receivable Related Party Write Offs LoansAndLeaseReceivableRelatedPartyWriteOffs	0	usd
CY2023Q4	us-gaap	Loans And Leases Receivable Related Parties LoansAndLeasesReceivableRelatedParties	38802000	usd
CY2023Q4	cbsh	Loans To Principal Holders LoansToPrincipalHolders	0	usd
CY2023Q4	cbsh	Unfunded Loan Commitments UnfundedLoanCommitments	14500000000	usd
CY2023Q4	cbsh	Unused Approved Credit Card Lines Of Credit UnusedApprovedCreditCardLinesOfCredit	5400000000	usd
CY2023Q4	cbsh	Pledged Financial Instruments Not Separately Reported Loans Receivable For Federal Home Loan Bank Debt PledgedFinancialInstrumentsNotSeparatelyReportedLoansReceivableForFederalHomeLoanBankDebt	3500000000	usd
CY2023Q4	cbsh	Pledged Financial Instruments Not Separately Reported Loans Pledged For Federal Reserve Bank Debt PledgedFinancialInstrumentsNotSeparatelyReportedLoansPledgedForFederalReserveBankDebt	3100000000	usd
CY2023Q4	cbsh	Sales Type And Direct Financing Leases Lease Receivable Net Of Deferred Origination Costs SalesTypeAndDirectFinancingLeasesLeaseReceivableNetOfDeferredOriginationCosts	867000000	usd
CY2022Q4	cbsh	Sales Type And Direct Financing Leases Lease Receivable Net Of Deferred Origination Costs SalesTypeAndDirectFinancingLeasesLeaseReceivableNetOfDeferredOriginationCosts	779900000	usd
CY2023Q4	us-gaap	Loans And Leases Receivable Deferred Income LoansAndLeasesReceivableDeferredIncome	98600000	usd
CY2022Q4	us-gaap	Loans And Leases Receivable Deferred Income LoansAndLeasesReceivableDeferredIncome	73200000	usd
CY2022Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	150136000	usd
CY2023	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	43325000	usd
CY2023	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	40168000	usd
CY2023	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	9102000	usd
CY2023	us-gaap	Financing Receivable Allowance For Credit Loss Writeoff After Recovery FinancingReceivableAllowanceForCreditLossWriteoffAfterRecovery	31066000	usd
CY2023Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	162395000	usd
CY2022Q4	us-gaap	Off Balance Sheet Credit Loss Liability OffBalanceSheetCreditLossLiability	33120000	usd
CY2021Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	150044000	usd
CY2022	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	19155000	usd
CY2022	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	29242000	usd
CY2022	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	10179000	usd
CY2022	us-gaap	Financing Receivable Allowance For Credit Loss Writeoff After Recovery FinancingReceivableAllowanceForCreditLossWriteoffAfterRecovery	19063000	usd
CY2022Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	150136000	usd
CY2021Q4	us-gaap	Off Balance Sheet Credit Loss Liability OffBalanceSheetCreditLossLiability	24204000	usd
CY2022	us-gaap	Off Balance Sheet Credit Loss Liability Credit Loss Expense Reversal OffBalanceSheetCreditLossLiabilityCreditLossExpenseReversal	8916000	usd
CY2022Q4	us-gaap	Off Balance Sheet Credit Loss Liability OffBalanceSheetCreditLossLiability	33120000	usd
CY2022Q4	cbsh	Financing Receivable Allowance For Credit Loss And Unfunded Lending Commitments Total FinancingReceivableAllowanceForCreditLossAndUnfundedLendingCommitmentsTotal	183256000	usd
CY2023Q4	cbsh	Financing Receivable Recorded Investment Currentor Lessthan30days Past Due FinancingReceivableRecordedInvestmentCurrentorLessthan30daysPastDue	17080238000	usd
CY2023Q4	cbsh	Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due FinancingReceivableRecordedInvestmentThirtyToEightyNineDaysPastDue	96065000	usd
CY2023Q4	us-gaap	Financing Receivable Recorded Investment90 Days Past Due And Still Accruing FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing	21864000	usd
CY2023Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	7312000	usd
CY2023Q4	us-gaap	Loans And Leases Receivable Gross Carrying Amount LoansAndLeasesReceivableGrossCarryingAmount	17205479000	usd
CY2022Q4	cbsh	Financing Receivable Recorded Investment Currentor Lessthan30days Past Due FinancingReceivableRecordedInvestmentCurrentorLessthan30daysPastDue	16229187000	usd
CY2022Q4	cbsh	Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due FinancingReceivableRecordedInvestmentThirtyToEightyNineDaysPastDue	49808000	usd
CY2022Q4	us-gaap	Financing Receivable Recorded Investment90 Days Past Due And Still Accruing FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing	15830000	usd
CY2022Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	8306000	usd
CY2022Q4	us-gaap	Loans And Leases Receivable Gross Carrying Amount LoansAndLeasesReceivableGrossCarryingAmount	16303131000	usd
CY2023Q4	us-gaap	Financing Receivable Nonaccrual No Allowance FinancingReceivableNonaccrualNoAllowance	4300000	usd
CY2022Q4	us-gaap	Financing Receivable Nonaccrual No Allowance FinancingReceivableNonaccrualNoAllowance	3800000	usd
CY2023Q4	cbsh	Credit Quality Personal Real Estate Loans Excluded CreditQualityPersonalRealEstateLoansExcluded	168900000	usd
CY2022Q4	cbsh	Credit Quality Personal Real Estate Loans Excluded CreditQualityPersonalRealEstateLoansExcluded	179200000	usd
CY2023Q4	cbsh	Consumer Healthcare Loans Excluded ConsumerHealthcareLoansExcluded	211300000	usd
CY2022Q4	cbsh	Consumer Healthcare Loans Excluded ConsumerHealthcareLoansExcluded	197500000	usd
CY2023Q4	cbsh	Credit Quality Personal Banking Loan Table Percentage Loans Excluded CreditQualityPersonalBankingLoanTablePercentageLoansExcluded	0.07	rate
CY2023	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	141470000	usd
CY2023	us-gaap	Financing Receivable Modification To Total Financing Receivables Percent FinancingReceivableModificationToTotalFinancingReceivablesPercent	0.008
CY2023Q4	us-gaap	Loans And Leases Receivable Impaired Commitment To Lend LoansAndLeasesReceivableImpairedCommitmentToLend	28400000	usd
CY2023	cbsh	Period After Which Loans Are Deemed In Default PeriodAfterWhichLoansAreDeemedInDefault	P90D
CY2023	us-gaap	Financing Receivable Modifications Subsequent Default Recorded Investment1 FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1	1867000	usd
CY2023	cbsh	Financing Receivable Modified In Period Current FinancingReceivableModifiedInPeriodCurrent	134936000	usd
CY2023	cbsh	Financing Receivable Modified In Period Thirty To Eighty Nine Days Past Due FinancingReceivableModifiedInPeriodThirtyToEightyNineDaysPastDue	5634000	usd
CY2023	cbsh	Financing Receivable Modified In Period Ninety Days Past Due FinancingReceivableModifiedInPeriodNinetyDaysPastDue	900000	usd
CY2023	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	141470000	usd
CY2022Q4	us-gaap	Financing Receivable Modifications Recorded Investment FinancingReceivableModificationsRecordedInvestment	198671000	usd
CY2022Q4	us-gaap	Financing Receivable Modifications Recorded Investment FinancingReceivableModificationsRecordedInvestment	198671000	usd
CY2022Q4	cbsh	Financing Receivable Troubled Debt Restructurings That Subsequently Defaulted Recorded Investment FinancingReceivableTroubledDebtRestructuringsThatSubsequentlyDefaultedRecordedInvestment	1139000	usd
CY2022	cbsh	Effect On Interest Income Resulting From Modification To Credit Card Loans EffectOnInterestIncomeResultingFromModificationToCreditCardLoans	661000	usd
CY2022Q4	us-gaap	Loans And Leases Receivable Impaired Commitment To Lend LoansAndLeasesReceivableImpairedCommitmentToLend	12600000	usd
CY2023Q4	us-gaap	Mortgages Held For Sale Fair Value Disclosure MortgagesHeldForSaleFairValueDisclosure	1600000	usd
CY2023Q4	cbsh	Unpaid Principal Balanceon Personal Real Estate Loans Heldfor Sale UnpaidPrincipalBalanceonPersonalRealEstateLoansHeldforSale	1500000	usd
CY2023Q4	cbsh	Student Loans Heldfor Sale Lowerof Costor Fair Value StudentLoansHeldforSaleLowerofCostorFairValue	2200000	usd
CY2023Q4	cbsh	Personal Real Estate Loans Hfs Past Due PersonalRealEstateLoansHFSPastDue	0	usd
CY2023Q4	cbsh	Hfs Student Loanson Non Accrual Status HFSStudentLoansonNonAccrualStatus	0	usd
CY2023Q4	cbsh	Hfs Student Loans Past Due HFSStudentLoansPastDue	0	usd
CY2023Q4	cbsh	Personal Real Estate Loans Hf Son Non Accrual Status PersonalRealEstateLoansHFSonNonAccrualStatus	0	usd
CY2023Q4	us-gaap	Real Estate Acquired Through Foreclosure RealEstateAcquiredThroughForeclosure	270000	usd
CY2022Q4	us-gaap	Real Estate Acquired Through Foreclosure RealEstateAcquiredThroughForeclosure	96000	usd
CY2023Q4	cbsh	Residential Real Estate Acquired Through Foreclosure Through Obtaining Physical Possession ResidentialRealEstateAcquiredThroughForeclosureThroughObtainingPhysicalPossession	270000	usd
CY2022Q4	cbsh	Residential Real Estate Acquired Through Foreclosure Through Obtaining Physical Possession ResidentialRealEstateAcquiredThroughForeclosureThroughObtainingPhysicalPossession	96000	usd
CY2023Q4	us-gaap	Other Foreclosed Assets OtherForeclosedAssets	1800000	usd
CY2022Q4	us-gaap	Other Foreclosed Assets OtherForeclosedAssets	1600000	usd
CY2023Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	9684760000	usd
CY2022Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	12238316000	usd
CY2023Q4	us-gaap	Trading Securities Debt TradingSecuritiesDebt	28830000	usd
CY2022Q4	us-gaap	Trading Securities Debt TradingSecuritiesDebt	43523000	usd
CY2023Q4	us-gaap	Equity Securities Fv Ni EquitySecuritiesFvNi	5723000	usd
CY2022Q4	us-gaap	Equity Securities Fv Ni EquitySecuritiesFvNi	6210000	usd
CY2023Q4	us-gaap	Equity Securities Without Readily Determinable Fair Value Amount EquitySecuritiesWithoutReadilyDeterminableFairValueAmount	6978000	usd
CY2022Q4	us-gaap	Equity Securities Without Readily Determinable Fair Value Amount EquitySecuritiesWithoutReadilyDeterminableFairValueAmount	6094000	usd
CY2023Q4	us-gaap	Federal Reserve Bank Stock FederalReserveBankStock	35166000	usd
CY2022Q4	us-gaap	Federal Reserve Bank Stock FederalReserveBankStock	34795000	usd
CY2023Q4	us-gaap	Federal Home Loan Bank Stock FederalHomeLoanBankStock	10640000	usd
CY2022Q4	us-gaap	Federal Home Loan Bank Stock FederalHomeLoanBankStock	10678000	usd
CY2023Q4	us-gaap	Equity Method Investments EquityMethodInvestments	0	usd
CY2022Q4	us-gaap	Equity Method Investments EquityMethodInvestments	1434000	usd
CY2023Q4	cbsh	Private Equity Investments PrivateEquityInvestments	176667000	usd
CY2022Q4	cbsh	Private Equity Investments PrivateEquityInvestments	178127000	usd
CY2023Q4	cbsh	Total Investment Securities TotalInvestmentSecurities	9948764000	usd
CY2022Q4	cbsh	Total Investment Securities TotalInvestmentSecurities	12519177000	usd
CY2023Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	10904765000	usd
CY2023Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	9684760000	usd
CY2023	cbsh	Percentage Decrease In Fair Value Below Amortized Cost PercentageDecreaseInFairValueBelowAmortizedCost	0.20
CY2023Q4	cbsh	Fair Value Securities On Other Than Temporary Impairment Watch List FairValueSecuritiesOnOtherThanTemporaryImpairmentWatchList	1200000000	usd
CY2022Q4	cbsh	Fair Value Securities On Other Than Temporary Impairment Watch List FairValueSecuritiesOnOtherThanTemporaryImpairmentWatchList	1300000000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	99075000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	1784000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	9494875000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	1218700000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	9593950000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	1220484000	usd
CY2022Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	4402724000	usd
CY2022Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	250660000	usd
CY2022Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	7625021000	usd
CY2022Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	1249972000	usd
CY2022Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	12027745000	usd
CY2022Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	1500632000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	9600000000	usd
CY2022Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	12000000000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	1200000000	usd
CY2023	cbsh	Af Ssecuritiesinlosspositionatperiodendchangeinunrealizedloss AFSsecuritiesinlosspositionatperiodendchangeinunrealizedloss	-280100000	usd
CY2023Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	10904765000	usd
CY2023Q4	cbsh	Available For Sale Securities Gross Unreailzed Gainat Period End AvailableForSaleSecuritiesGrossUnreailzedGainatPeriodEnd	479000	usd
CY2023Q4	cbsh	Available For Sale Securities Gross Unrealized Lossat Period End AvailableForSaleSecuritiesGrossUnrealizedLossatPeriodEnd	1220484000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss DebtSecuritiesAvailableForSaleAllowanceForCreditLoss	0	usd
CY2023Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	9684760000	usd
CY2022Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	13738206000	usd
CY2022Q4	cbsh	Available For Sale Securities Gross Unreailzed Gainat Period End AvailableForSaleSecuritiesGrossUnreailzedGainatPeriodEnd	742000	usd
CY2022Q4	cbsh	Available For Sale Securities Gross Unrealized Lossat Period End AvailableForSaleSecuritiesGrossUnrealizedLossatPeriodEnd	1500632000	usd
CY2022Q4	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss DebtSecuritiesAvailableForSaleAllowanceForCreditLoss	0	usd
CY2022Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	12238316000	usd
CY2023	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	1101782000	usd
CY2022	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	86240000	usd
CY2021	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	69809000	usd
CY2023	cbsh	Proceedsfromsaleofequitysecurities Proceedsfromsaleofequitysecurities	0	usd
CY2022	cbsh	Proceedsfromsaleofequitysecurities Proceedsfromsaleofequitysecurities	17000	usd
CY2021	cbsh	Proceedsfromsaleofequitysecurities Proceedsfromsaleofequitysecurities	0	usd
CY2023	cbsh	Proceeds From Sale Of Other Securities ProceedsFromSaleOfOtherSecurities	40167000	usd
CY2022	cbsh	Proceeds From Sale Of Other Securities ProceedsFromSaleOfOtherSecurities	20714000	usd
CY2021	cbsh	Proceeds From Sale Of Other Securities ProceedsFromSaleOfOtherSecurities	11002000	usd
CY2023	cbsh	Proceedsfromsalesandmaturitiesofavailableforsaledebtequityandothersecurities Proceedsfromsalesandmaturitiesofavailableforsaledebtequityandothersecurities	1141949000	usd
CY2022	cbsh	Proceedsfromsalesandmaturitiesofavailableforsaledebtequityandothersecurities Proceedsfromsalesandmaturitiesofavailableforsaledebtequityandothersecurities	106971000	usd
CY2021	cbsh	Proceedsfromsalesandmaturitiesofavailableforsaledebtequityandothersecurities Proceedsfromsalesandmaturitiesofavailableforsaledebtequityandothersecurities	80811000	usd
CY2023	us-gaap	Gain Loss On Investments GainLossOnInvestments	14985000	usd
CY2022	us-gaap	Gain Loss On Investments GainLossOnInvestments	20506000	usd
CY2021	us-gaap	Gain Loss On Investments GainLossOnInvestments	30059000	usd
CY2023Q4	cbsh	Investment Securities Pledged At Fair Value InvestmentSecuritiesPledgedAtFairValue	7500000000	usd
CY2022Q4	cbsh	Investment Securities Pledged At Fair Value InvestmentSecuritiesPledgedAtFairValue	4700000000	usd
CY2023Q4	cbsh	Investments Exceeding Ten Percent Of Stockholders Equity InvestmentsExceedingTenPercentOfStockholdersEquity	0
CY2023Q4	cbsh	Percentage Of Stockholders Equity Of Which No Investment From Single Issuer Exceeds PercentageOfStockholdersEquityOfWhichNoInvestmentFromSingleIssuerExceeds	0.10
CY2023Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	1090607000	usd
CY2022Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	1027041000	usd
CY2023Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	621548000	usd
CY2022Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	608132000	usd
CY2023Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	469059000	usd
CY2022Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	418909000	usd
CY2023	us-gaap	Depreciation Depreciation	36100000	usd
CY2022	us-gaap	Depreciation Depreciation	32300000	usd
CY2021	us-gaap	Depreciation Depreciation	31900000	usd
CY2023	us-gaap	Cost Of Property Repairs And Maintenance CostOfPropertyRepairsAndMaintenance	18500000	usd
CY2022	us-gaap	Cost Of Property Repairs And Maintenance CostOfPropertyRepairsAndMaintenance	17700000	usd
CY2021	us-gaap	Cost Of Property Repairs And Maintenance CostOfPropertyRepairsAndMaintenance	16000000	usd
CY2023	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	903000	usd
CY2022	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	1400000	usd
CY2021	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	29000	usd
CY2023Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	19273000	usd
CY2023Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	8694000	usd
CY2023Q4	us-gaap	Valuation Allowances And Reserves Balance ValuationAllowancesAndReservesBalance	0	usd
CY2023Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	10579000	usd
CY2022Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	53457000	usd
CY2022Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	41823000	usd
CY2022Q4	us-gaap	Valuation Allowances And Reserves Balance ValuationAllowancesAndReservesBalance	0	usd
CY2022Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	11634000	usd
CY2023	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	usd
CY2022	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	usd
CY2021	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	usd
CY2023Q4	us-gaap	Goodwill Goodwill	146539000	usd
CY2022Q4	us-gaap	Goodwill Goodwill	138921000	usd
CY2023	cbsh	Disposal Of Intangible Assets DisposalOfIntangibleAssets	25700000	usd
CY2023	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	7600000	usd
CY2023	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	1400000	usd
CY2022	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	2000000	usd
CY2021	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	3100000	usd
CY2023Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	1315000	usd
CY2023Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	1153000	usd
CY2023Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	1007000	usd
CY2023Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	867000	usd
CY2023Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	752000	usd
CY2023Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	26500000	usd
CY2023Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	26900000	usd
CY2022Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	24900000	usd
CY2022Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	25200000	usd
CY2023	us-gaap	Lease Cost LeaseCost	8300000	usd
CY2022	us-gaap	Lease Cost LeaseCost	7900000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	6290000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	4434000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	3833000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	3609000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	3303000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	12624000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	34093000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	7199000	usd
CY2023Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	26894000	usd
CY2023Q4	us-gaap	Unrecorded Unconditional Purchase Obligation Balance Sheet Amount UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount	743000	usd
CY2023Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P9Y10M24D
CY2022Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P10Y7M6D
CY2023Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.0411
CY2022Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.0373
CY2023	us-gaap	Operating Lease Payments OperatingLeasePayments	6486000	usd
CY2022	us-gaap	Operating Lease Payments OperatingLeasePayments	6529000	usd
CY2023	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	7085000	usd
CY2022	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	5161000	usd
CY2023	us-gaap	Sales Type And Direct Financing Leases Profit Loss SalesTypeAndDirectFinancingLeasesProfitLoss	31127000	usd
CY2022	us-gaap	Sales Type And Direct Financing Leases Profit Loss SalesTypeAndDirectFinancingLeasesProfitLoss	22144000	usd
CY2023	us-gaap	Operating Lease Lease Income OperatingLeaseLeaseIncome	13036000	usd
CY2022	us-gaap	Operating Lease Lease Income OperatingLeaseLeaseIncome	8948000	usd
CY2023	us-gaap	Lease Income LeaseIncome	44163000	usd
CY2022	us-gaap	Lease Income LeaseIncome	31092000	usd
CY2023Q4	us-gaap	Sales Type And Direct Financing Leases Lease Receivable SalesTypeAndDirectFinancingLeasesLeaseReceivable	729891000	usd
CY2022Q4	us-gaap	Sales Type And Direct Financing Leases Lease Receivable SalesTypeAndDirectFinancingLeasesLeaseReceivable	704509000	usd
CY2023Q4	cbsh	Salestypeand Direct Financing Leases Unguaranteed Residual Asset SalestypeandDirectFinancingLeasesUnguaranteedResidualAsset	134105000	usd
CY2022Q4	cbsh	Salestypeand Direct Financing Leases Unguaranteed Residual Asset SalestypeandDirectFinancingLeasesUnguaranteedResidualAsset	72157000	usd
CY2023Q4	us-gaap	Net Investment In Lease NetInvestmentInLease	863996000	usd
CY2022Q4	us-gaap	Net Investment In Lease NetInvestmentInLease	776666000	usd
CY2023Q4	us-gaap	Deferred Costs Leasing Net DeferredCostsLeasingNet	3024000	usd
CY2022Q4	us-gaap	Deferred Costs Leasing Net DeferredCostsLeasingNet	3222000	usd
CY2023Q4	cbsh	Sales Type And Direct Financing Leases Lease Receivable Net Of Deferred Origination Costs SalesTypeAndDirectFinancingLeasesLeaseReceivableNetOfDeferredOriginationCosts	867020000	usd
CY2022Q4	cbsh	Sales Type And Direct Financing Leases Lease Receivable Net Of Deferred Origination Costs SalesTypeAndDirectFinancingLeasesLeaseReceivableNetOfDeferredOriginationCosts	779888000	usd
CY2023Q4	us-gaap	Sales Type And Direct Financing Leases Lease Receivable Payments To Be Received Next Twelve Months SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedNextTwelveMonths	218641000	usd
CY2023Q4	us-gaap	Lessor Operating Lease Payments To Be Received Next Twelve Months LessorOperatingLeasePaymentsToBeReceivedNextTwelveMonths	11976000	usd
CY2023Q4	cbsh	Lessor Total Paymentstobe Received Next Twelve Months LessorTotalPaymentstobeReceivedNextTwelveMonths	230617000	usd
CY2023Q4	us-gaap	Sales Type And Direct Financing Leases Lease Receivable Payments To Be Received Two Years SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedTwoYears	182103000	usd
CY2023Q4	us-gaap	Lessor Operating Lease Payments To Be Received Two Years LessorOperatingLeasePaymentsToBeReceivedTwoYears	10725000	usd
CY2023Q4	cbsh	Lessor Total Paymentstobe Received Two Years LessorTotalPaymentstobeReceivedTwoYears	192828000	usd
CY2023Q4	us-gaap	Sales Type And Direct Financing Leases Lease Receivable Payments To Be Received Three Years SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedThreeYears	146430000	usd
CY2023Q4	us-gaap	Lessor Operating Lease Payments To Be Received Three Years LessorOperatingLeasePaymentsToBeReceivedThreeYears	10080000	usd
CY2023Q4	cbsh	Lessor Total Paymentstobe Received Three Years LessorTotalPaymentstobeReceivedThreeYears	156510000	usd
CY2023Q4	us-gaap	Sales Type And Direct Financing Leases Lease Receivable Payments To Be Received Four Years SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedFourYears	110328000	usd
CY2023Q4	us-gaap	Lessor Operating Lease Payments To Be Received Four Years LessorOperatingLeasePaymentsToBeReceivedFourYears	9034000	usd
CY2023Q4	cbsh	Lessor Total Paymentstobe Received Four Years LessorTotalPaymentstobeReceivedFourYears	119362000	usd
CY2023Q4	us-gaap	Sales Type And Direct Financing Leases Lease Receivable Payments To Be Received Five Years SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedFiveYears	67850000	usd
CY2023Q4	us-gaap	Lessor Operating Lease Payments To Be Received Five Years LessorOperatingLeasePaymentsToBeReceivedFiveYears	8352000	usd
CY2023Q4	cbsh	Lessor Total Paymentstobe Received Five Years LessorTotalPaymentstobeReceivedFiveYears	76202000	usd
CY2023Q4	us-gaap	Sales Type And Direct Financing Leases Lease Receivable Payments To Be Received Thereafter SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedThereafter	80861000	usd
CY2023Q4	us-gaap	Lessor Operating Lease Payments To Be Received Thereafter LessorOperatingLeasePaymentsToBeReceivedThereafter	46783000	usd
CY2023Q4	cbsh	Lessor Total Paymentstobe Received Thereafter LessorTotalPaymentstobeReceivedThereafter	127644000	usd
CY2023Q4	us-gaap	Sales Type And Direct Financing Leases Lease Receivable Payments To Be Received SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceived	806213000	usd
CY2023Q4	us-gaap	Lessor Operating Lease Payments To Be Received LessorOperatingLeasePaymentsToBeReceived	96950000	usd
CY2023Q4	cbsh	Lessor Total Paymentstobe Received LessorTotalPaymentstobeReceived	903163000	usd
CY2023Q4	us-gaap	Sales Type And Direct Financing Leases Lease Receivable Undiscounted Excess Amount SalesTypeAndDirectFinancingLeasesLeaseReceivableUndiscountedExcessAmount	76322000	usd
CY2023Q4	us-gaap	Sales Type And Direct Financing Leases Lease Receivable SalesTypeAndDirectFinancingLeasesLeaseReceivable	729891000	usd
CY2023Q4	us-gaap	Time Deposit Maturities Year One TimeDepositMaturitiesYearOne	2647310000	usd
CY2023Q4	us-gaap	Time Deposit Maturities Year Two TimeDepositMaturitiesYearTwo	185368000	usd
CY2023Q4	us-gaap	Time Deposit Maturities Year Three TimeDepositMaturitiesYearThree	29435000	usd
CY2023Q4	us-gaap	Time Deposit Maturities Year Four TimeDepositMaturitiesYearFour	7906000	usd
CY2023Q4	us-gaap	Time Deposit Maturities Year Five TimeDepositMaturitiesYearFive	5671000	usd
CY2023Q4	us-gaap	Time Deposits TimeDeposits	2875690000	usd
CY2023Q4	cbsh	Aggregateamountoftimeopenandcertificatesofdepositthatexceedthe250000 Fdi Cinsurancelimit Aggregateamountoftimeopenandcertificatesofdepositthatexceedthe250000FDICinsurancelimit	1300000	usd
CY2023Q4	cbsh	Shorttermrepurchaseagreementcomprisedofnoninsuredcustomerfunds Shorttermrepurchaseagreementcomprisedofnoninsuredcustomerfunds	2600000000	usd
CY2023Q4	cbsh	Repurchase Agreements Accrued Interest RepurchaseAgreementsAccruedInterest	695000	usd
CY2022Q4	cbsh	Repurchase Agreements Accrued Interest RepurchaseAgreementsAccruedInterest	275000	usd
CY2021Q4	cbsh	Repurchase Agreements Accrued Interest RepurchaseAgreementsAccruedInterest	9000	usd
CY2023Q4	cbsh	Federal Home Loan Bank Advances Outstanding FederalHomeLoanBankAdvancesOutstanding	0	usd
CY2023Q4	cbsh	Federal Home Loan Bank Letters Of Credit Issued FederalHomeLoanBankLettersOfCreditIssued	639500000	usd
CY2023	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	124787000	usd
CY2023	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-6228000	usd
CY2023	us-gaap	Federal Income Tax Expense Benefit Continuing Operations FederalIncomeTaxExpenseBenefitContinuingOperations	118559000	usd
CY2023	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	17161000	usd
CY2023	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-1171000	usd
CY2023	us-gaap	State And Local Income Tax Expense Benefit Continuing Operations StateAndLocalIncomeTaxExpenseBenefitContinuingOperations	15990000	usd
CY2023	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	141948000	usd
CY2023	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-7399000	usd
CY2023	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	134549000	usd
CY2022	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	96849000	usd
CY2022	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	19990000	usd
CY2022	us-gaap	Federal Income Tax Expense Benefit Continuing Operations FederalIncomeTaxExpenseBenefitContinuingOperations	116839000	usd
CY2022	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	13793000	usd
CY2022	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	1726000	usd
CY2022	us-gaap	State And Local Income Tax Expense Benefit Continuing Operations StateAndLocalIncomeTaxExpenseBenefitContinuingOperations	15519000	usd
CY2022	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	110642000	usd
CY2022	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	21716000	usd
CY2022	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	132358000	usd
CY2021	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	104924000	usd
CY2021	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	22184000	usd
CY2021	us-gaap	Federal Income Tax Expense Benefit Continuing Operations FederalIncomeTaxExpenseBenefitContinuingOperations	127108000	usd
CY2021	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	15174000	usd
CY2021	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	3429000	usd
CY2021	us-gaap	State And Local Income Tax Expense Benefit Continuing Operations StateAndLocalIncomeTaxExpenseBenefitContinuingOperations	18603000	usd
CY2021	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	120098000	usd
CY2021	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	25613000	usd
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	145711000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax	69972000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax	-382697000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax	-80211000	usd
CY2023	cbsh	Componentsofincome Tax Recorded Directlyto Equity Changein Fair Valueof Cash Flow Hedge ComponentsofincomeTaxRecordedDirectlytoEquityChangeinFairValueofCashFlowHedge	-6017000	usd
CY2022	cbsh	Componentsofincome Tax Recorded Directlyto Equity Changein Fair Valueof Cash Flow Hedge ComponentsofincomeTaxRecordedDirectlytoEquityChangeinFairValueofCashFlowHedge	-6446000	usd
CY2021	cbsh	Componentsofincome Tax Recorded Directlyto Equity Changein Fair Valueof Cash Flow Hedge ComponentsofincomeTaxRecordedDirectlytoEquityChangeinFairValueofCashFlowHedge	-6040000	usd
CY2023	cbsh	Income Tax Expense Accumulated Pension Benefit Loss IncomeTaxExpenseAccumulatedPensionBenefitLoss	1197000	usd
CY2022	cbsh	Income Tax Expense Accumulated Pension Benefit Loss IncomeTaxExpenseAccumulatedPensionBenefitLoss	1161000	usd
CY2021	cbsh	Income Tax Expense Accumulated Pension Benefit Loss IncomeTaxExpenseAccumulatedPensionBenefitLoss	1484000	usd
CY2023	us-gaap	Income Tax Effects Allocated Directly To Equity IncomeTaxEffectsAllocatedDirectlyToEquity	65152000	usd
CY2022	us-gaap	Income Tax Effects Allocated Directly To Equity IncomeTaxEffectsAllocatedDirectlyToEquity	-387982000	usd
CY2021	us-gaap	Income Tax Effects Allocated Directly To Equity IncomeTaxEffectsAllocatedDirectlyToEquity	-84767000	usd
CY2023Q4	us-gaap	Deferred Tax Assets Unrealized Losses On Availablefor Sale Securities Gross DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross	305001000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Unrealized Losses On Availablefor Sale Securities Gross DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross	374973000	usd
CY2023Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Provision For Loan Losses DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses	44702000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Provision For Loan Losses DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses	43553000	usd
CY2023Q4	cbsh	Deferredtaxassetsunearnedincome Deferredtaxassetsunearnedincome	10810000	usd
CY2022Q4	cbsh	Deferredtaxassetsunearnedincome Deferredtaxassetsunearnedincome	5534000	usd
CY2023Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Accrued Liabilities DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities	10531000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Accrued Liabilities DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities	6748000	usd
CY2023Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	8082000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	7491000	usd
CY2023Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Compensation DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation	7894000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Compensation DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation	7864000	usd
CY2023Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	812000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	1737000	usd
CY2023Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	387832000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	447900000	usd
CY2023Q4	us-gaap	Deferred Tax Liabilities Leasing Arrangements DeferredTaxLiabilitiesLeasingArrangements	99453000	usd
CY2022Q4	us-gaap	Deferred Tax Liabilities Leasing Arrangements DeferredTaxLiabilitiesLeasingArrangements	91913000	usd
CY2023Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	21016000	usd
CY2022Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	17210000	usd
CY2023Q4	us-gaap	Deferred Tax Liabilities Derivatives DeferredTaxLiabilitiesDerivatives	9468000	usd
CY2022Q4	us-gaap	Deferred Tax Liabilities Derivatives DeferredTaxLiabilitiesDerivatives	19747000	usd
CY2023Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	7545000	usd
CY2022Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	7519000	usd
CY2023Q4	us-gaap	Deferred Tax Liabilities Investments DeferredTaxLiabilitiesInvestments	6888000	usd
CY2022Q4	us-gaap	Deferred Tax Liabilities Investments DeferredTaxLiabilitiesInvestments	9393000	usd
CY2023Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	7235000	usd
CY2022Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	8138000	usd
CY2023Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	151605000	usd
CY2022Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	153920000	usd
CY2023Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	236227000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	293980000	usd
CY2021	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.21	rate
CY2023	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.21	rate
CY2022	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.21	rate
CY2023	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	128438000	usd
CY2022	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	130359000	usd
CY2021	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	142060000	usd
CY2023	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	12633000	usd
CY2022	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	12260000	usd
CY2021	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	14697000	usd
CY2023	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	7002000	usd
CY2022	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	8473000	usd
CY2021	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	9002000	usd
CY2023	cbsh	Effective Income Tax Rate Reconciliation Contributionof Appreciated Securities Amount EffectiveIncomeTaxRateReconciliationContributionofAppreciatedSecuritiesAmount	-2101000	usd
CY2022	cbsh	Effective Income Tax Rate Reconciliation Contributionof Appreciated Securities Amount EffectiveIncomeTaxRateReconciliationContributionofAppreciatedSecuritiesAmount	-1376000	usd
CY2021	cbsh	Effective Income Tax Rate Reconciliation Contributionof Appreciated Securities Amount EffectiveIncomeTaxRateReconciliationContributionofAppreciatedSecuritiesAmount	-1090000	usd
CY2023	cbsh	Effective Income Tax Rate Reconciliation Sharebased Award Payments Amount EffectiveIncomeTaxRateReconciliationSharebasedAwardPaymentsAmount	-1176000	usd
CY2022	cbsh	Effective Income Tax Rate Reconciliation Sharebased Award Payments Amount EffectiveIncomeTaxRateReconciliationSharebasedAwardPaymentsAmount	-1669000	usd
CY2021	cbsh	Effective Income Tax Rate Reconciliation Sharebased Award Payments Amount EffectiveIncomeTaxRateReconciliationSharebasedAwardPaymentsAmount	-2941000	usd
CY2023	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-445000	usd
CY2022	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-1495000	usd
CY2021	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-193000	usd
CY2023	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	134549000	usd
CY2022	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	132358000	usd
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	145711000	usd
CY2023Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	1300000	usd
CY2022Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	1200000	usd
CY2023Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	1000000	usd
CY2022Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	1000000	usd
CY2022Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	1205000	usd
CY2021Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	1276000	usd
CY2023	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	25000	usd
CY2022	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	21000	usd
CY2023	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	336000	usd
CY2022	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	235000	usd
CY2023	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	296000	usd
CY2022	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	327000	usd
CY2023Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	1270000	usd
CY2022Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	1205000	usd
CY2023	us-gaap	Employee Benefits And Share Based Compensation EmployeeBenefitsAndShareBasedCompensation	91086000	usd
CY2022	us-gaap	Employee Benefits And Share Based Compensation EmployeeBenefitsAndShareBasedCompensation	82787000	usd
CY2021	us-gaap	Employee Benefits And Share Based Compensation EmployeeBenefitsAndShareBasedCompensation	78010000	usd
CY2022	cbsh	Definedbenefitplandiscretionarycontributionbyemployer Definedbenefitplandiscretionarycontributionbyemployer	0	usd
CY2021	cbsh	Definedbenefitplandiscretionarycontributionbyemployer Definedbenefitplandiscretionarycontributionbyemployer	0	usd
CY2023	cbsh	Definedbenefitplandiscretionarycontributionbyemployer Definedbenefitplandiscretionarycontributionbyemployer	0	usd
CY2023Q4	us-gaap	Defined Benefit Plan Expected Future Employer Contributions Next Fiscal Year DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear	0	usd
CY2023	cbsh	Cerp Contributions CerpContributions	806000	usd
CY2022	cbsh	Cerp Contributions CerpContributions	14000	usd
CY2021	cbsh	Cerp Contributions CerpContributions	14000	usd
CY2023	us-gaap	Defined Benefit Plan Service Cost DefinedBenefitPlanServiceCost	499000	usd
CY2022	us-gaap	Defined Benefit Plan Service Cost DefinedBenefitPlanServiceCost	516000	usd
CY2021	us-gaap	Defined Benefit Plan Service Cost DefinedBenefitPlanServiceCost	388000	usd
CY2023	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	4615000	usd
CY2022	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	2725000	usd
CY2021	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	2169000	usd
CY2023	us-gaap	Defined Benefit Plan Expected Return On Plan Assets DefinedBenefitPlanExpectedReturnOnPlanAssets	4051000	usd
CY2022	us-gaap	Defined Benefit Plan Expected Return On Plan Assets DefinedBenefitPlanExpectedReturnOnPlanAssets	4515000	usd
CY2021	us-gaap	Defined Benefit Plan Expected Return On Plan Assets DefinedBenefitPlanExpectedReturnOnPlanAssets	4532000	usd
CY2023	us-gaap	Defined Benefit Plan Amortization Of Prior Service Cost Credit DefinedBenefitPlanAmortizationOfPriorServiceCostCredit	-271000	usd
CY2022	us-gaap	Defined Benefit Plan Amortization Of Prior Service Cost Credit DefinedBenefitPlanAmortizationOfPriorServiceCostCredit	-271000	usd
CY2021	us-gaap	Defined Benefit Plan Amortization Of Prior Service Cost Credit DefinedBenefitPlanAmortizationOfPriorServiceCostCredit	-271000	usd
CY2023	us-gaap	Defined Benefit Plan Amortization Of Gains Losses DefinedBenefitPlanAmortizationOfGainsLosses	-1464000	usd
CY2022	us-gaap	Defined Benefit Plan Amortization Of Gains Losses DefinedBenefitPlanAmortizationOfGainsLosses	-1717000	usd
CY2021	us-gaap	Defined Benefit Plan Amortization Of Gains Losses DefinedBenefitPlanAmortizationOfGainsLosses	-2578000	usd
CY2023	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	2256000	usd
CY2022	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	172000	usd
CY2021	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	332000	usd
CY2022Q4	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	95842000	usd
CY2021Q4	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	121738000	usd
CY2023	us-gaap	Defined Benefit Plan Service Cost DefinedBenefitPlanServiceCost	499000	usd
CY2022	us-gaap	Defined Benefit Plan Service Cost DefinedBenefitPlanServiceCost	516000	usd
CY2023	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	4615000	usd
CY2022	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	2725000	usd
CY2023	us-gaap	Defined Benefit Plan Benefit Obligation Benefits Paid DefinedBenefitPlanBenefitObligationBenefitsPaid	7667000	usd
CY2022	us-gaap	Defined Benefit Plan Benefit Obligation Benefits Paid DefinedBenefitPlanBenefitObligationBenefitsPaid	6933000	usd
CY2023	us-gaap	Defined Benefit Plan Actuarial Gain Loss DefinedBenefitPlanActuarialGainLoss	-660000	usd
CY2022	us-gaap	Defined Benefit Plan Actuarial Gain Loss DefinedBenefitPlanActuarialGainLoss	22204000	usd
CY2023Q4	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	93949000	usd
CY2022Q4	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	95842000	usd
CY2022Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	88396000	usd
CY2021Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	109807000	usd
CY2023	us-gaap	Defined Benefit Plan Actual Return On Plan Assets DefinedBenefitPlanActualReturnOnPlanAssets	8307000	usd
CY2022	us-gaap	Defined Benefit Plan Actual Return On Plan Assets DefinedBenefitPlanActualReturnOnPlanAssets	-14492000	usd
CY2023	us-gaap	Defined Benefit Plan Contributions By Employer DefinedBenefitPlanContributionsByEmployer	806000	usd
CY2022	us-gaap	Defined Benefit Plan Contributions By Employer DefinedBenefitPlanContributionsByEmployer	14000	usd
CY2023	us-gaap	Defined Benefit Plan Plan Assets Benefits Paid DefinedBenefitPlanPlanAssetsBenefitsPaid	7667000	usd
CY2022	us-gaap	Defined Benefit Plan Plan Assets Benefits Paid DefinedBenefitPlanPlanAssetsBenefitsPaid	6933000	usd
CY2023Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	89842000	usd
CY2022Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	88396000	usd
CY2023Q4	us-gaap	Defined Benefit Plan Funded Status Of Plan DefinedBenefitPlanFundedStatusOfPlan	-4107000	usd
CY2022Q4	us-gaap	Defined Benefit Plan Funded Status Of Plan DefinedBenefitPlanFundedStatusOfPlan	-7446000	usd
CY2023	us-gaap	Increase Decrease In Pension Plan Obligations IncreaseDecreaseInPensionPlanObligations	3300000	usd
CY2023	cbsh	Defined Benefit Plan Fair Value Of Plan Assets Period Increase Decrease More Than Expected DefinedBenefitPlanFairValueOfPlanAssetsPeriodIncreaseDecreaseMoreThanExpected	4300000	usd
CY2022Q4	us-gaap	Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate	0.0519	rate
CY2023Q4	us-gaap	Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate	0.0498	rate
CY2023Q4	us-gaap	Defined Benefit Plan Accumulated Benefit Obligation DefinedBenefitPlanAccumulatedBenefitObligation	93900000	usd
CY2022Q4	us-gaap	Defined Benefit Plan Accumulated Benefit Obligation DefinedBenefitPlanAccumulatedBenefitObligation	95800000	usd
CY2023Q4	us-gaap	Defined Benefit Plan Accumulated Other Comprehensive Income Net Prior Service Cost Credit Before Tax DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax	181000	usd
CY2022Q4	us-gaap	Defined Benefit Plan Accumulated Other Comprehensive Income Net Prior Service Cost Credit Before Tax DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax	452000	usd
CY2023Q4	us-gaap	Defined Benefit Plan Accumulated Other Comprehensive Income Net Gains Losses Before Tax DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax	18304000	usd
CY2022Q4	us-gaap	Defined Benefit Plan Accumulated Other Comprehensive Income Net Gains Losses Before Tax DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax	23363000	usd
CY2023Q4	us-gaap	Defined Benefit Plan Accumulated Other Comprehensive Income Before Tax DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax	-18123000	usd
CY2022Q4	us-gaap	Defined Benefit Plan Accumulated Other Comprehensive Income Before Tax DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax	-22911000	usd
CY2023Q4	cbsh	Cumulative Employer Contributions In Excess Of Net Periodic Benefit Cost CumulativeEmployerContributionsInExcessOfNetPeriodicBenefitCost	14016000	usd
CY2022Q4	cbsh	Cumulative Employer Contributions In Excess Of Net Periodic Benefit Cost CumulativeEmployerContributionsInExcessOfNetPeriodicBenefitCost	15465000	usd
CY2023Q4	us-gaap	Defined Benefit Plan Amounts Recognized In Balance Sheet DefinedBenefitPlanAmountsRecognizedInBalanceSheet	-4107000	usd
CY2022Q4	us-gaap	Defined Benefit Plan Amounts Recognized In Balance Sheet DefinedBenefitPlanAmountsRecognizedInBalanceSheet	-7446000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Net Unamortized Gain Loss Arising During Period Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax	-3594000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Net Unamortized Gain Loss Arising During Period Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax	-3197000	usd
CY2023	us-gaap	Defined Benefit Plan Amortization Of Gains Losses DefinedBenefitPlanAmortizationOfGainsLosses	-1464000	usd
CY2022	us-gaap	Defined Benefit Plan Amortization Of Gains Losses DefinedBenefitPlanAmortizationOfGainsLosses	-1717000	usd
CY2023	us-gaap	Defined Benefit Plan Amortization Of Prior Service Cost Credit DefinedBenefitPlanAmortizationOfPriorServiceCostCredit	-271000	usd
CY2022	us-gaap	Defined Benefit Plan Amortization Of Prior Service Cost Credit DefinedBenefitPlanAmortizationOfPriorServiceCostCredit	-271000	usd
CY2023	us-gaap	Defined Benefit Plan Amounts Recognized In Other Comprehensive Income Loss Net Gain Loss Before Tax DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeLossNetGainLossBeforeTax	-4787000	usd
CY2022	us-gaap	Defined Benefit Plan Amounts Recognized In Other Comprehensive Income Loss Net Gain Loss Before Tax DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeLossNetGainLossBeforeTax	-4643000	usd
CY2023Q4	cbsh	Defined Benefit Plan Amount Recognized In Net Periodic Pension Cost And Other Comprehensive Income DefinedBenefitPlanAmountRecognizedInNetPeriodicPensionCostAndOtherComprehensiveIncome	2531000	usd
CY2022Q4	cbsh	Defined Benefit Plan Amount Recognized In Net Periodic Pension Cost And Other Comprehensive Income DefinedBenefitPlanAmountRecognizedInNetPeriodicPensionCostAndOtherComprehensiveIncome	4471000	usd
CY2023Q4	us-gaap	Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate	0.0498	rate
CY2022Q4	us-gaap	Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate	0.0519	rate
CY2021Q4	us-gaap	Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate	0.0258	rate
CY2023Q4	cbsh	Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Assumed Credit On Cash Balance Accounts DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationAssumedCreditOnCashBalanceAccounts	0.0500	rate
CY2022Q4	cbsh	Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Assumed Credit On Cash Balance Accounts DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationAssumedCreditOnCashBalanceAccounts	0.0500	rate
CY2021Q4	cbsh	Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Assumed Credit On Cash Balance Accounts DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationAssumedCreditOnCashBalanceAccounts	0.0500	rate
CY2023	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate	0.0519	rate
CY2022	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate	0.0264	rate
CY2021	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate	0.0225	rate
CY2023	cbsh	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Effective Rateof Interest DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostEffectiveRateofInterest	0.0509	rate
CY2022	cbsh	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Effective Rateof Interest DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostEffectiveRateofInterest	0.0215	rate
CY2021	cbsh	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Effective Rateof Interest DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostEffectiveRateofInterest	0.0163	rate
CY2023	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Expected Long Term Return On Assets DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets	0.0475	rate
CY2022	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Expected Long Term Return On Assets DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets	0.0425	rate
CY2021	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Expected Long Term Return On Assets DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets	0.0425	rate
CY2023	cbsh	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Assumed Credit On Cash Balance Accounts DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostAssumedCreditOnCashBalanceAccounts	0.0500	rate
CY2022	cbsh	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Assumed Credit On Cash Balance Accounts DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostAssumedCreditOnCashBalanceAccounts	0.0500	rate
CY2021	cbsh	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Assumed Credit On Cash Balance Accounts DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostAssumedCreditOnCashBalanceAccounts	0.0500	rate
CY2023	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Expected Long Term Return On Assets DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets	0.0475	rate
CY2023	cbsh	Annualized Return For Pension Plan AnnualizedReturnForPensionPlan	0.049	rate
CY2023	cbsh	Rate Of Return Of Pension Plan RateOfReturnOfPensionPlan	0.103	rate
CY2022	cbsh	Rate Of Return Of Pension Plan RateOfReturnOfPensionPlan	-0.120	rate
CY2023	cbsh	Pension Expense Expected In Next Fiscal Year PensionExpenseExpectedInNextFiscalYear	1700000	usd
CY2023	us-gaap	Pension Expense PensionExpense	2300000	usd
CY2023Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Next Twelve Months DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths	7883000	usd
CY2023Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Two DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo	7859000	usd
CY2023Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Three DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree	7734000	usd
CY2023Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Four DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour	7618000	usd
CY2023Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Five DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive	7434000	usd
CY2023Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Five Fiscal Years Thereafter DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter	33673000	usd
CY2023Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant	6197988	shares
CY2023	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	17100000	usd
CY2022	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	17000000	usd
CY2021	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	15400000	usd
CY2023	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	3200000	usd
CY2022	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	3000000	usd
CY2021	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	2700000	usd
CY2022Q4	cbsh	Nonvested Share Awards Balances NonvestedShareAwardsBalances	1206004	shares
CY2022Q4	cbsh	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Nonvested Share Awards Weighted Average Grant Date Unit Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsNonvestedShareAwardsWeightedAverageGrantDateUnitFairValue	55.43
CY2023	cbsh	Nonvested Share Awards Granted In Period NonvestedShareAwardsGrantedInPeriod	331889	shares
CY2023	cbsh	Share Based Compensation Granted Nonvested Share Award Weighted Average Grant Date Fair Value ShareBasedCompensationGrantedNonvestedShareAwardWeightedAverageGrantDateFairValue	59.11
CY2023	cbsh	Nonvested Share Awards Vested In Period NonvestedShareAwardsVestedInPeriod	341152	shares
CY2023	cbsh	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Nonvested Share Awards Vested In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsNonvestedShareAwardsVestedInPeriodWeightedAverageGrantDateFairValue	48.30
CY2023	cbsh	Nonvested Share Awards Forfeited In Period NonvestedShareAwardsForfeitedInPeriod	30406	shares
CY2023	cbsh	Share Based Compensation Forfeited Nonvested Share Award Weighted Average Grant Date Fair Value ShareBasedCompensationForfeitedNonvestedShareAwardWeightedAverageGrantDateFairValue	58.13
CY2023Q4	cbsh	Nonvested Share Awards Balances NonvestedShareAwardsBalances	1166335	shares
CY2023Q4	cbsh	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Nonvested Share Awards Weighted Average Grant Date Unit Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsNonvestedShareAwardsWeightedAverageGrantDateUnitFairValue	58.48
CY2023	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Total Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue	20900000	usd
CY2022	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Total Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue	18800000	usd
CY2021	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Total Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue	17600000	usd
CY2022Q4	cbsh	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Number ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNumber	995591	shares
CY2022Q4	cbsh	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsWeightedAverageExercisePrice	44.59
CY2023	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod	94173	shares
CY2023	cbsh	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageExercisePrice	62.52
CY2023	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeited In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod	5250	shares
CY2023	cbsh	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeited In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriodWeightedAverageExercisePrice	60.99
CY2023	cbsh	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Expired In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpiredInPeriod	6114	shares
CY2023	cbsh	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Expired In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpiredInPeriodWeightedAverageExercisePrice	49.63
CY2023	cbsh	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Exercised In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisedInPeriod	55079	shares
CY2023	cbsh	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Exercised In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisedInPeriodWeightedAverageExercisePrice	26.33
CY2023Q4	cbsh	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Number ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNumber	1023321	shares
CY2023Q4	cbsh	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsWeightedAverageExercisePrice	47.10
CY2023	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Outstanding Weighted Average Remaining Contractual Terms ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageRemainingContractualTerms	P4Y9M18D
CY2023Q4	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Equity Instruments Other Than Options Aggregate Intrinsic Value Outstanding SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueOutstanding	9189000	usd
CY2023Q4	cbsh	Stock Appreciation Rights Activity Number Of Shares Exercisable StockAppreciationRightsActivityNumberOfSharesExercisable	786452	shares
CY2023Q4	cbsh	Stock Appreciation Rights Weighted Average Exercise Price Stock Options Exercisable StockAppreciationRightsWeightedAverageExercisePriceStockOptionsExercisable	42.66
CY2023	cbsh	Stock Appreciation Rights Weighted Average Remaining Contractual Term Options Exercisable StockAppreciationRightsWeightedAverageRemainingContractualTermOptionsExercisable	P3Y10M24D
CY2023Q4	cbsh	Stock Appreciation Rights Aggregate Intrinsic Value Options Exercisable StockAppreciationRightsAggregateIntrinsicValueOptionsExercisable	9132000	usd
CY2023Q4	cbsh	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises And Stock Appreciation Rights Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesAndStockAppreciationRightsExercisesInPeriodTotalIntrinsicValue	1723000	usd
CY2022Q4	cbsh	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises And Stock Appreciation Rights Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesAndStockAppreciationRightsExercisesInPeriodTotalIntrinsicValue	2448000	usd
CY2021Q4	cbsh	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises And Stock Appreciation Rights Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesAndStockAppreciationRightsExercisesInPeriodTotalIntrinsicValue	7664000	usd
CY2023Q4	cbsh	Tax Benefit Realized From Options And Stock Appreciation Rights Exercised TaxBenefitRealizedFromOptionsAndStockAppreciationRightsExercised	362000	usd
CY2022Q4	cbsh	Tax Benefit Realized From Options And Stock Appreciation Rights Exercised TaxBenefitRealizedFromOptionsAndStockAppreciationRightsExercised	462000	usd
CY2021Q4	cbsh	Tax Benefit Realized From Options And Stock Appreciation Rights Exercised TaxBenefitRealizedFromOptionsAndStockAppreciationRightsExercised	1488000	usd
CY2023Q4	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	34000000	usd
CY2023	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Vested And Expected To Vest Exercisable Weighted Average Remaining Contractual Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageRemainingContractualTerm1	P3Y1M6D
CY2023	cbsh	Common Stock Dividend Rate Percentage CommonStockDividendRatePercentage	0.05
CY2022Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-1086864000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Before Reclassifications Before Tax OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax	266176000	usd
CY2023	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Before Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax	5572000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Before Tax OtherComprehensiveIncomeLossBeforeTax	260604000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	65152000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	195452000	usd
CY2023Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-891412000	usd
CY2021Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	77080000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Before Reclassifications Before Tax OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax	-1550290000	usd
CY2022	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Before Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax	1636000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Before Tax OtherComprehensiveIncomeLossBeforeTax	-1551926000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	-387982000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-1163944000	usd
CY2022Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-1086864000	usd
CY2023	us-gaap	Number Of Operating Segments NumberOfOperatingSegments	3	operating_segments
CY2023Q4	cbsh	Segment Reclassification Loans SegmentReclassificationLoans	1900000000	usd
CY2023	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	998129000	usd
CY2023	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	35451000	usd
CY2023	us-gaap	Noninterest Income NoninterestIncome	573045000	usd
CY2023	us-gaap	Gain Loss On Investments GainLossOnInvestments	14985000	usd
CY2023	us-gaap	Noninterest Expense NoninterestExpense	930982000	usd
CY2023	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	619726000	usd
CY2022	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	942185000	usd
CY2022	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	28071000	usd
CY2022	us-gaap	Noninterest Income NoninterestIncome	546535000	usd
CY2022	us-gaap	Gain Loss On Investments GainLossOnInvestments	20506000	usd
CY2022	us-gaap	Noninterest Expense NoninterestExpense	848777000	usd
CY2022	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	632378000	usd
CY2021	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	835424000	usd
CY2021	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	-66326000	usd
CY2021	us-gaap	Noninterest Income NoninterestIncome	560393000	usd
CY2021	us-gaap	Gain Loss On Investments GainLossOnInvestments	30059000	usd
CY2021	us-gaap	Noninterest Expense NoninterestExpense	805901000	usd
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	686301000	usd
CY2023Q4	cbsh	Average Assets AverageAssets	31940615000	usd
CY2023Q4	cbsh	Average Loan Portfolio Including Held For Sale AverageLoanPortfolioIncludingHeldForSale	16782842000	usd
CY2023Q4	cbsh	Segment Reporting Information Average Goodwill And Other Intangible Assets SegmentReportingInformationAverageGoodwillAndOtherIntangibleAssets	158067000	usd
CY2023Q4	cbsh	Segment Reporting Information Average Deposits SegmentReportingInformationAverageDeposits	25308381000	usd
CY2022Q4	cbsh	Average Assets AverageAssets	33605317000	usd
CY2022Q4	cbsh	Average Loan Portfolio Including Held For Sale AverageLoanPortfolioIncludingHeldForSale	15569741000	usd
CY2022Q4	cbsh	Segment Reporting Information Average Goodwill And Other Intangible Assets SegmentReportingInformationAverageGoodwillAndOtherIntangibleAssets	154639000	usd
CY2022Q4	cbsh	Segment Reporting Information Average Deposits SegmentReportingInformationAverageDeposits	28100697000	usd
CY2023	cbsh	Common Stock Dividend Rate Percentage CommonStockDividendRatePercentage	0.05
CY2023Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	5
CY2023	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	363000	shares
CY2022	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	171000	shares
CY2021	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	97000	shares
CY2022Q2	us-gaap	Stock Repurchase Program Number Of Shares Authorized To Be Repurchased StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased	5000000	shares
CY2023Q4	us-gaap	Stock Repurchase Program Remaining Number Of Shares Authorized To Be Repurchased StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased	1757247	shares
CY2023Q4	cbsh	Tier One Risk Based Common Capital Requiredtobe Well Capitalizedto Risk Weighted Assets TierOneRiskBasedCommonCapitalRequiredtobeWellCapitalizedtoRiskWeightedAssets	0.065	rate
CY2023Q4	us-gaap	Tier One Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets	0.080	rate
CY2023Q4	us-gaap	Capital Required To Be Well Capitalized To Risk Weighted Assets CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets	0.100	rate
CY2023Q4	us-gaap	Tier One Leverage Capital Required To Be Well Capitalized To Average Assets TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets	0.050	rate
CY2023	cbsh	Percentof Revenuenotinscopeof Asc606 PercentofRevenuenotinscopeofASC606	0.64	rate
CY2023	us-gaap	Noninterest Income NoninterestIncome	573045000	usd
CY2022	us-gaap	Noninterest Income NoninterestIncome	546535000	usd
CY2021	us-gaap	Noninterest Income NoninterestIncome	560393000	usd
CY2023	cbsh	Bank Card Transaction Fees BankCardTransactionFees	191156000	usd
CY2022	cbsh	Bank Card Transaction Fees BankCardTransactionFees	176144000	usd
CY2021	cbsh	Bank Card Transaction Fees BankCardTransactionFees	167891000	usd
CY2023	cbsh	Trustfeerevenue Trustfeerevenue	190954000	usd
CY2022	cbsh	Trustfeerevenue Trustfeerevenue	184719000	usd
CY2021	cbsh	Trustfeerevenue Trustfeerevenue	188227000	usd
CY2023	cbsh	Depositfeerevenue Depositfeerevenue	90992000	usd
CY2022	cbsh	Depositfeerevenue Depositfeerevenue	94381000	usd
CY2021	cbsh	Depositfeerevenue Depositfeerevenue	97217000	usd
CY2023Q4	us-gaap	Mortgages Held For Sale Fair Value Disclosure MortgagesHeldForSaleFairValueDisclosure	1585000	usd
CY2023Q4	us-gaap	Financial Instruments Owned Us Government And Agency Obligations At Fair Value FinancialInstrumentsOwnedUSGovernmentAndAgencyObligationsAtFairValue	816514000	usd
CY2023Q4	cbsh	Us Government Sponsored Enterprises Debt Securities USGovernmentSponsoredEnterprisesDebtSecurities	43962000	usd
CY2023Q4	us-gaap	Financial Instruments Owned State And Municipal Government Obligations At Fair Value FinancialInstrumentsOwnedStateAndMunicipalGovernmentObligationsAtFairValue	1197419000	usd
CY2023Q4	cbsh	Financial Instruments Owned Agency Mortgage Backed Securities At Fair Value FinancialInstrumentsOwnedAgencyMortgageBackedSecuritiesAtFairValue	3901346000	usd
CY2023Q4	cbsh	Financial Instruments Owned Non Agency Mortgage Backed Securities At Fair Value FinancialInstrumentsOwnedNonAgencyMortgageBackedSecuritiesAtFairValue	1157898000	usd
CY2023Q4	cbsh	Other Asset Backed Securities Disclosure OtherAssetBackedSecuritiesDisclosure	2107485000	usd
CY2023Q4	cbsh	Financial Instruments Owned Other Debt Securities At Fair Value FinancialInstrumentsOwnedOtherDebtSecuritiesAtFairValue	460136000	usd
CY2023Q4	us-gaap	Trading Securities TradingSecurities	28830000	usd
CY2023Q4	us-gaap	Equity Securities Fv Ni EquitySecuritiesFvNi	5723000	usd
CY2023Q4	us-gaap	Financial Instruments Owned Principal Investments At Fair Value FinancialInstrumentsOwnedPrincipalInvestmentsAtFairValue	176667000	usd
CY2023Q4	us-gaap	Derivative Assets DerivativeAssets	116876000	usd
CY2023Q4	us-gaap	Deferred Compensation Plan Assets DeferredCompensationPlanAssets	20538000	usd
CY2023Q4	us-gaap	Assets Fair Value Disclosure AssetsFairValueDisclosure	10034979000	usd
CY2023Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	37899000	usd
CY2023Q4	us-gaap	Deferred Compensation Liability Current And Noncurrent DeferredCompensationLiabilityCurrentAndNoncurrent	20538000	usd
CY2023Q4	us-gaap	Liabilities Fair Value Disclosure LiabilitiesFairValueDisclosure	58437000	usd
CY2022Q4	us-gaap	Mortgages Held For Sale Fair Value Disclosure MortgagesHeldForSaleFairValueDisclosure	0	usd
CY2022Q4	us-gaap	Financial Instruments Owned Us Government And Agency Obligations At Fair Value FinancialInstrumentsOwnedUSGovernmentAndAgencyObligationsAtFairValue	1035406000	usd
CY2022Q4	cbsh	Us Government Sponsored Enterprises Debt Securities USGovernmentSponsoredEnterprisesDebtSecurities	43108000	usd
CY2022Q4	us-gaap	Financial Instruments Owned State And Municipal Government Obligations At Fair Value FinancialInstrumentsOwnedStateAndMunicipalGovernmentObligationsAtFairValue	1767109000	usd
CY2022Q4	cbsh	Financial Instruments Owned Agency Mortgage Backed Securities At Fair Value FinancialInstrumentsOwnedAgencyMortgageBackedSecuritiesAtFairValue	4308427000	usd
CY2022Q4	cbsh	Financial Instruments Owned Non Agency Mortgage Backed Securities At Fair Value FinancialInstrumentsOwnedNonAgencyMortgageBackedSecuritiesAtFairValue	1211607000	usd
CY2022Q4	cbsh	Other Asset Backed Securities Disclosure OtherAssetBackedSecuritiesDisclosure	3397801000	usd
CY2022Q4	cbsh	Financial Instruments Owned Other Debt Securities At Fair Value FinancialInstrumentsOwnedOtherDebtSecuritiesAtFairValue	474858000	usd
CY2022Q4	us-gaap	Trading Securities TradingSecurities	43523000	usd
CY2022Q4	us-gaap	Equity Securities Fv Ni EquitySecuritiesFvNi	6210000	usd
CY2022Q4	us-gaap	Financial Instruments Owned Principal Investments At Fair Value FinancialInstrumentsOwnedPrincipalInvestmentsAtFairValue	178127000	usd
CY2022Q4	us-gaap	Derivative Assets DerivativeAssets	60492000	usd
CY2022Q4	us-gaap	Deferred Compensation Plan Assets DeferredCompensationPlanAssets	17856000	usd
CY2022Q4	us-gaap	Assets Fair Value Disclosure AssetsFairValueDisclosure	12544524000	usd
CY2022Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	54984000	usd
CY2022Q4	us-gaap	Deferred Compensation Liability Current And Noncurrent DeferredCompensationLiabilityCurrentAndNoncurrent	17856000	usd
CY2022Q4	us-gaap	Liabilities Fair Value Disclosure LiabilitiesFairValueDisclosure	72840000	usd
CY2023	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Earnings1 FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1	-24299000	usd
CY2023	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Other Comprehensive Income Loss FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss	57000	usd
CY2023	cbsh	Investment Securities Called InvestmentSecuritiesCalled	1000000	usd
CY2023	cbsh	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Discount Accretion FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetDiscountAccretion	49000	usd
CY2023	cbsh	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Purchase Of Private Equity Securities FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchaseOfPrivateEquitySecurities	15220000	usd
CY2023	cbsh	Sales And Repayments Of Private Equity Securities SalesAndRepaymentsOfPrivateEquitySecurities	41341000	usd
CY2023	cbsh	Capitalized Interest Or Dividends CapitalizedInterestOrDividends	362000	usd
CY2023Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	177614000	usd
CY2023	cbsh	Change In Unrealized Gains Or Losses Related To Assets Held Level3 Fair Value Measurements ChangeInUnrealizedGainsOrLossesRelatedToAssetsHeldLevel3FairValueMeasurements	24799000	usd
CY2023	cbsh	Gains Losses Included In Oci Attributable To Change In Unrealized Gains Losses Relating To Assets Still Held Total GainsLossesIncludedInOCIAttributableToChangeInUnrealizedGainsLossesRelatingToAssetsStillHeldTotal	35000	usd
CY2021Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	149390000	usd
CY2022	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Earnings1 FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1	-43833000	usd
CY2022	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Other Comprehensive Income Loss FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss	-148000	usd
CY2022	cbsh	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Discount Accretion FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetDiscountAccretion	-5000	usd
CY2022	cbsh	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Purchase Of Private Equity Securities FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchaseOfPrivateEquitySecurities	12281000	usd
CY2022	cbsh	Sales And Repayments Of Private Equity Securities SalesAndRepaymentsOfPrivateEquitySecurities	-25437000	usd
CY2022	cbsh	Capitalized Interest Or Dividends CapitalizedInterestOrDividends	-44000	usd
CY2022Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	179968000	usd
CY2022	cbsh	Change In Unrealized Gains Or Losses Related To Assets Held Level3 Fair Value Measurements ChangeInUnrealizedGainsOrLossesRelatedToAssetsHeldLevel3FairValueMeasurements	35333000	usd
CY2022	cbsh	Gains Losses Included In Oci Attributable To Change In Unrealized Gains Losses Relating To Assets Still Held Total GainsLossesIncludedInOCIAttributableToChangeInUnrealizedGainsLossesRelatingToAssetsStillHeldTotal	-148000	usd
CY2023Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	37899000	usd
CY2022Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	54984000	usd
CY2023Q4	cbsh	Loans Nonrecurring Basis LoansNonrecurringBasis	1517000	usd
CY2023	cbsh	Loans Nonrecurring Basis Gains Losses LoansNonrecurringBasisGainsLosses	-1662000	usd
CY2023Q4	cbsh	Long Lived Assets Nonrecurring Basis LongLivedAssetsNonrecurringBasis	2662000	usd
CY2023	cbsh	Long Lived Assets Nonrecurring Basis Gains Losses LongLivedAssetsNonrecurringBasisGainsLosses	-193000	usd
CY2022Q4	cbsh	Loans Nonrecurring Basis LoansNonrecurringBasis	1988000	usd
CY2022	cbsh	Loans Nonrecurring Basis Gains Losses LoansNonrecurringBasisGainsLosses	-2090000	usd
CY2022Q4	cbsh	Mortgage Servicing Rights Nonrecurring Basis MortgageServicingRightsNonrecurringBasis	10929000	usd
CY2022	cbsh	Mortgage Servicing Rights Nonrecurring Basis Gains Losses MortgageServicingRightsNonrecurringBasisGainsLosses	304000	usd
CY2022Q4	cbsh	Long Lived Assets Nonrecurring Basis LongLivedAssetsNonrecurringBasis	480000	usd
CY2022	cbsh	Long Lived Assets Nonrecurring Basis Gains Losses LongLivedAssetsNonrecurringBasisGainsLosses	-965000	usd
CY2023Q4	us-gaap	Derivative Notional Amount DerivativeNotionalAmount	5194716000	usd
CY2022Q4	us-gaap	Derivative Notional Amount DerivativeNotionalAmount	3742521000	usd
CY2023	us-gaap	Derivative Description Of Terms DerivativeDescriptionOfTerms	As of December 31, 2023, the Company held four interest rate floors indexed to 1-month SOFR to hedge the risk of declining interest rates on certain floating rate commercial loans. The floors have a combined notional value of $2.0 billion and are forward-starting. Each of the four interest rate floors has a six-year term and a notional amount of $500 million. In the event that the index rate falls below zero, the maximum rate that the Company can earn on the notional amount of each floor is limited to the strike rate
CY2023	us-gaap	Maximum Length Of Time Hedged In Interest Rate Cash Flow Hedge1 MaximumLengthOfTimeHedgedInInterestRateCashFlowHedge1	P7Y
CY2023Q4	us-gaap	Derivative Assets DerivativeAssets	116876000	usd
CY2022Q4	us-gaap	Derivative Assets DerivativeAssets	60492000	usd
CY2023Q4	us-gaap	Derivative Asset Fair Value Gross Asset Including Not Subject To Master Netting Arrangement DerivativeAssetFairValueGrossAssetIncludingNotSubjectToMasterNettingArrangement	116876000	usd
CY2023Q4	cbsh	Derivative Asset Amount Offset By Liabiilty DerivativeAssetAmountOffsetByLiabiilty	0	usd
CY2023Q4	us-gaap	Derivative Assets DerivativeAssets	116876000	usd
CY2023Q4	us-gaap	Derivative Liability Fair Value Gross Liability Including Not Subject To Master Netting Arrangement DerivativeLiabilityFairValueGrossLiabilityIncludingNotSubjectToMasterNettingArrangement	37899000	usd
CY2023Q4	cbsh	Derivative Liability Amount Offset By Asset DerivativeLiabilityAmountOffsetByAsset	0	usd
CY2023Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	37899000	usd
CY2022Q4	us-gaap	Derivative Asset Fair Value Gross Asset Including Not Subject To Master Netting Arrangement DerivativeAssetFairValueGrossAssetIncludingNotSubjectToMasterNettingArrangement	60492000	usd
CY2022Q4	cbsh	Derivative Asset Amount Offset By Liabiilty DerivativeAssetAmountOffsetByLiabiilty	0	usd
CY2022Q4	us-gaap	Derivative Assets DerivativeAssets	60492000	usd
CY2022Q4	us-gaap	Derivative Liability Fair Value Gross Liability Including Not Subject To Master Netting Arrangement DerivativeLiabilityFairValueGrossLiabilityIncludingNotSubjectToMasterNettingArrangement	54984000	usd
CY2022Q4	cbsh	Derivative Liability Amount Offset By Asset DerivativeLiabilityAmountOffsetByAsset	0	usd
CY2022Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	54984000	usd
CY2023Q4	cbsh	Commercial Letters Of Credit CommercialLettersOfCredit	2571000	usd
CY2022Q4	cbsh	Commercial Letters Of Credit CommercialLettersOfCredit	4393000	usd
CY2023	us-gaap	Operating Costs And Expenses OperatingCostsAndExpenses	3791000	usd
CY2022	us-gaap	Operating Costs And Expenses OperatingCostsAndExpenses	2775000	usd
CY2021	us-gaap	Operating Costs And Expenses OperatingCostsAndExpenses	2609000	usd
CY2023Q4	ecd	Rule10b51 Arr Adopted Flag Rule10b51ArrAdoptedFlag	false
CY2023Q4	ecd	Non Rule10b51 Arr Adopted Flag NonRule10b51ArrAdoptedFlag	false
CY2023Q4	ecd	Non Rule10b51 Arr Trmntd Flag NonRule10b51ArrTrmntdFlag	false
CY2023Q4	ecd	Rule10b51 Arr Trmntd Flag Rule10b51ArrTrmntdFlag	false
CY2023	dei	Auditor Name AuditorName	KPMG, LLP
CY2023	dei	Auditor Location AuditorLocation	Kansas City, Missouri
CY2023	dei	Auditor Firm AuditorFirmId	185

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$CBSH
COMMERCE BANCSHARES INC /MO/ Stock $cbsh

2024 Q1 Form 10-K Financial Statement

#000002235624000013 Filed on February 22, 2024

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$CBSH COMMERCE BANCSHARES INC /MO/ Stock $cbsh

2024 Q1 Form 10-K Financial Statement

#000002235624000013 Filed on February 22, 2024

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$CBSH
COMMERCE BANCSHARES INC /MO/ Stock $cbsh