$CBSH
COMMERCE BANCSHARES INC /MO/ Stock $cbsh

$cbsh Overview Financials Valuation SEC Filings Company Website

2022 Q4 Form 10-Q Financial Statement

#000002235622000051 Filed on November 04, 2022

Income Statement

Concept	2022 Q4	2022 Q3
Revenue		$0.00
YoY Change
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	$11.51M	$11.71M
YoY Change	1.82%	5.51%
% of Gross Profit
Operating Expenses
YoY Change
Operating Profit
YoY Change
Interest Expense		$16.29M
YoY Change		453.43%
% of Operating Profit
Other Income/Expense, Net
YoY Change
Pretax Income	$168.2M	$160.1M
YoY Change	12.78%	-0.18%
Income Tax	$34.50M	$33.94M
% Of Pretax Income	20.52%	21.19%
Net Earnings	$130.4M	$122.8M
YoY Change	13.51%	0.21%
Net Earnings / Revenue
Basic Earnings Per Share		$1.03
Diluted Earnings Per Share	$1.00	$1.02
COMMON SHARES
Basic Shares Outstanding	119.4M shares	119.9M shares
Diluted Shares Outstanding

Balance Sheet

Concept	2022 Q4	2022 Q3
SHORT-TERM ASSETS
Cash & Short-Term Investments
YoY Change
Cash & Equivalents	$897.8M	$1.009B
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	$418.9M	$407.8M
YoY Change	7.76%	8.04%
Goodwill	$138.9M	$138.9M
YoY Change	0.0%	0.0%
Intangibles	$15.23M	$15.60M
YoY Change	-2.16%	7.89%
Long-Term Investments	$1.434M	$1.434M
YoY Change	-21.81%	-21.81%
Other Assets
YoY Change
Total Long-Term Assets
YoY Change
TOTAL ASSETS
Total Short-Term Assets
Total Long-Term Assets
Total Assets	$31.88B	$32.60B
YoY Change	-13.12%	-5.49%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable
YoY Change
Accrued Expenses
YoY Change
Deferred Revenue
YoY Change
Short-Term Debt	$2.842B	$2.315B
YoY Change	-6.0%	2.69%
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$2.842B	$2.315B
YoY Change	-6.0%	2.69%
LONG-TERM LIABILITIES
Long-Term Debt	$9.672M	$1.831M
YoY Change	-25.6%	-54.23%
Other Long-Term Liabilities	$355.5M	$443.8M
YoY Change	-9.31%	-26.29%
Total Long-Term Liabilities	$365.2M	$445.6M
YoY Change	-9.83%	-26.47%
TOTAL LIABILITIES
Total Short-Term Liabilities	$2.842B	$2.315B
Total Long-Term Liabilities	$365.2M	$445.6M
Total Liabilities	$29.39B	$30.23B
YoY Change	-11.57%	-2.5%
SHAREHOLDERS EQUITY
Retained Earnings	$31.62M	$353.4M
YoY Change	-65.81%	-10.89%
Common Stock	$629.3M	$610.8M
YoY Change	3.03%	3.64%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$41.74M	$176.9M
YoY Change	26.6%	92.23%
Treasury Stock Shares	605.1K shares	2.553M shares
Shareholders Equity	$2.465B	$2.352B
YoY Change
Total Liabilities & Shareholders Equity	$31.88B	$32.60B
YoY Change	-13.12%	-5.49%

Cashflow Statement

Concept	2022 Q4	2022 Q3
OPERATING ACTIVITIES
Net Income	$130.4M	$122.8M
YoY Change	13.51%	0.21%
Depreciation, Depletion And Amortization	$11.51M	$11.71M
YoY Change	1.82%	5.51%
Cash From Operating Activities	$89.60M	$183.6M
YoY Change	-19.71%	15.55%
INVESTING ACTIVITIES
Capital Expenditures	$18.56M	-$17.65M
YoY Change	-196.14%	13.88%
Acquisitions
YoY Change
Other Investing Activities	$508.0M	$569.9M
YoY Change	-216.89%	-162.14%
Cash From Investing Activities	$489.4M	$552.3M
YoY Change	-207.8%	-159.22%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-690.3M	-798.7M
YoY Change	-128.91%	-266.75%
NET CHANGE
Cash From Operating Activities	89.60M	183.6M
Cash From Investing Activities	489.4M	552.3M
Cash From Financing Activities	-690.3M	-798.7M
Net Change In Cash	-111.3M	-62.84M
YoY Change	-105.44%	-78.68%
FREE CASH FLOW
Cash From Operating Activities	$89.60M	$183.6M
Capital Expenditures	$18.56M	-$17.65M
Free Cash Flow	$71.04M	$201.3M
YoY Change	-45.73%	15.4%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
	dei	Entity Central Index Key EntityCentralIndexKey	0000022356
	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2022Q3	cbsh	Purchase Of Risk Participation Agreement PurchaseOfRiskParticipationAgreement	0	usd
CY2022Q3	cbsh	Investment Securities Called InvestmentSecuritiesCalled	0	usd
	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2022
	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	Q3
	dei	Amendment Flag AmendmentFlag	false
	cbsh	Investment Securities Called InvestmentSecuritiesCalled	0	usd
CY2021Q3	cbsh	Sales And Repayments Of Private Equity Securities SalesAndRepaymentsOfPrivateEquitySecurities	0	usd
CY2021Q3	cbsh	Capitalized Interest Or Dividends CapitalizedInterestOrDividends	0	usd
CY2021Q3	cbsh	Purchase Of Risk Participation Agreement PurchaseOfRiskParticipationAgreement	0	usd
	dei	Document Type DocumentType	10-Q
	dei	Document Quarterly Report DocumentQuarterlyReport	true
	dei	Document Period End Date DocumentPeriodEndDate	2022-09-30
	dei	Document Transition Report DocumentTransitionReport	false
	dei	Entity File Number EntityFileNumber	001-36502
	dei	Entity Registrant Name EntityRegistrantName	COMMERCE BANCSHARES, INC.
	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	MO
	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	43-0889454
	dei	Entity Address Address Line1 EntityAddressAddressLine1	1000 Walnut
	dei	Entity Address City Or Town EntityAddressCityOrTown	Kansas City,
	dei	Entity Address State Or Province EntityAddressStateOrProvince	MO
	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	64106
	dei	City Area Code CityAreaCode	816
	dei	Local Phone Number LocalPhoneNumber	234-2000
	dei	Security12b Title Security12bTitle	$5 Par Value Common Stock
	dei	Trading Symbol TradingSymbol	CBSH
	dei	Security Exchange Name SecurityExchangeName	NASDAQ
	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
	dei	Entity Small Business EntitySmallBusiness	false
	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
	dei	Entity Shell Company EntityShellCompany	false
CY2022Q4	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	119352570	shares
CY2022Q3	us-gaap	Loans And Leases Receivable Net Of Deferred Income LoansAndLeasesReceivableNetOfDeferredIncome	15898958000	usd
CY2021Q4	us-gaap	Loans And Leases Receivable Net Of Deferred Income LoansAndLeasesReceivableNetOfDeferredIncome	15176359000	usd
CY2022Q3	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	143377000	usd
CY2021Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	150044000	usd
CY2022Q3	us-gaap	Loans And Leases Receivable Net Reported Amount LoansAndLeasesReceivableNetReportedAmount	15755581000	usd
CY2021Q4	us-gaap	Loans And Leases Receivable Net Reported Amount LoansAndLeasesReceivableNetReportedAmount	15026315000	usd
CY2022Q3	us-gaap	Mortgages Held For Sale Fair Value Disclosure MortgagesHeldForSaleFairValueDisclosure	1426000	usd
CY2021Q4	us-gaap	Mortgages Held For Sale Fair Value Disclosure MortgagesHeldForSaleFairValueDisclosure	5570000	usd
CY2022Q3	us-gaap	Loans Receivable Held For Sale Amount LoansReceivableHeldForSaleAmount	8062000	usd
CY2021Q4	us-gaap	Loans Receivable Held For Sale Amount LoansReceivableHeldForSaleAmount	8615000	usd
CY2022Q3	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	14176324000	usd
CY2021Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	14419133000	usd
CY2022Q3	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss DebtSecuritiesAvailableForSaleAllowanceForCreditLoss	0	usd
CY2021Q4	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss DebtSecuritiesAvailableForSaleAllowanceForCreditLoss	0	usd
CY2022Q3	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	12632510000	usd
CY2021Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	14450027000	usd
CY2022Q3	us-gaap	Trading Securities TradingSecurities	39222000	usd
CY2021Q4	us-gaap	Trading Securities TradingSecurities	46235000	usd
CY2022Q3	us-gaap	Equity Securities Fv Ni And Without Readily Determinable Fair Value EquitySecuritiesFvNiAndWithoutReadilyDeterminableFairValue	8954000	usd
CY2021Q4	us-gaap	Equity Securities Fv Ni And Without Readily Determinable Fair Value EquitySecuritiesFvNiAndWithoutReadilyDeterminableFairValue	9202000	usd
CY2022Q3	cbsh	Other Securities OtherSecurities	222742000	usd
CY2021Q4	cbsh	Other Securities OtherSecurities	194047000	usd
CY2022Q3	cbsh	Total Investment Securities TotalInvestmentSecurities	12903428000	usd
CY2021Q4	cbsh	Total Investment Securities TotalInvestmentSecurities	14699511000	usd
CY2022Q3	us-gaap	Federal Funds Sold And Securities Purchased Under Agreements To Resell FederalFundsSoldAndSecuritiesPurchasedUnderAgreementsToResell	14020000	usd
CY2021Q4	us-gaap	Federal Funds Sold And Securities Purchased Under Agreements To Resell FederalFundsSoldAndSecuritiesPurchasedUnderAgreementsToResell	2800000	usd
CY2022Q3	cbsh	Long Term Securities Purchased Under Agreements To Resell LongTermSecuritiesPurchasedUnderAgreementsToResell	1275000000	usd
CY2021Q4	cbsh	Long Term Securities Purchased Under Agreements To Resell LongTermSecuritiesPurchasedUnderAgreementsToResell	1625000000	usd
CY2022Q3	us-gaap	Interest Bearing Deposits In Banks InterestBearingDepositsInBanks	642943000	usd
CY2021Q4	us-gaap	Interest Bearing Deposits In Banks InterestBearingDepositsInBanks	3971217000	usd
CY2022Q3	us-gaap	Cash And Due From Banks CashAndDueFromBanks	344178000	usd
CY2021Q4	us-gaap	Cash And Due From Banks CashAndDueFromBanks	305539000	usd
CY2022Q3	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	407833000	usd
CY2021Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	388738000	usd
CY2022Q3	us-gaap	Goodwill Goodwill	138921000	usd
CY2021Q4	us-gaap	Goodwill Goodwill	138921000	usd
CY2022Q3	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	15599000	usd
CY2021Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	15570000	usd
CY2022Q3	us-gaap	Other Assets OtherAssets	1097031000	usd
CY2021Q4	us-gaap	Other Assets OtherAssets	506862000	usd
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CY2022Q3	us-gaap	Noninterest Bearing Deposit Liabilities NoninterestBearingDepositLiabilities	10468591000	usd
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CY2021Q4	us-gaap	Interest Bearing Deposit Liabilities InterestBearingDepositLiabilities	16598085000	usd
CY2022Q3	us-gaap	Time Deposits Less Than100000 TimeDepositsLessThan100000	391145000	usd
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CY2022Q3	us-gaap	Federal Funds Purchased And Securities Sold Under Agreements To Repurchase FederalFundsPurchasedAndSecuritiesSoldUnderAgreementsToRepurchase	2314590000	usd
CY2021Q4	us-gaap	Federal Funds Purchased And Securities Sold Under Agreements To Repurchase FederalFundsPurchasedAndSecuritiesSoldUnderAgreementsToRepurchase	3022967000	usd
CY2022Q3	us-gaap	Other Borrowings OtherBorrowings	1831000	usd
CY2021Q4	us-gaap	Other Borrowings OtherBorrowings	12560000	usd
CY2022Q3	us-gaap	Other Liabilities OtherLiabilities	443752000	usd
CY2021Q4	us-gaap	Other Liabilities OtherLiabilities	392164000	usd
CY2022Q3	us-gaap	Liabilities Liabilities	30231489000	usd
CY2021Q4	us-gaap	Liabilities Liabilities	33240764000	usd
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CY2022Q3	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	140000000	shares
CY2021Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	140000000	shares
CY2021Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	122160705	shares
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CY2021Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	476392	shares
CY2022Q3	us-gaap	Treasury Stock Value TreasuryStockValue	176943000	usd
CY2021Q4	us-gaap	Treasury Stock Value TreasuryStockValue	32973000	usd
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CY2022Q3	us-gaap	Minority Interest MinorityInterest	19513000	usd
CY2021Q4	us-gaap	Minority Interest MinorityInterest	11026000	usd
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	us-gaap	Interest Income Federal Funds Sold And Securities Purchased Under Agreements To Resell InterestIncomeFederalFundsSoldAndSecuritiesPurchasedUnderAgreementsToResell	3000	usd
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	cbsh	Interest On Long Term Securities Purchased Under Agreements To Resell InterestOnLongTermSecuritiesPurchasedUnderAgreementsToResell	15669000	usd
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	us-gaap	Interest Income Deposits With Financial Institutions InterestIncomeDepositsWithFinancialInstitutions	9150000	usd
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CY2022Q3	cbsh	Interest On Other Borrowings InterestOnOtherBorrowings	-425000	usd
CY2021Q3	cbsh	Interest On Other Borrowings InterestOnOtherBorrowings	-9000	usd
	cbsh	Interest On Other Borrowings InterestOnOtherBorrowings	-554000	usd
	cbsh	Interest On Other Borrowings InterestOnOtherBorrowings	-11000	usd
CY2022Q3	us-gaap	Interest Expense InterestExpense	16293000	usd
CY2021Q3	us-gaap	Interest Expense InterestExpense	2944000	usd
	us-gaap	Interest Expense InterestExpense	25058000	usd
	us-gaap	Interest Expense InterestExpense	10044000	usd
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CY2021Q3	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	214037000	usd
	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	687544000	usd
	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	627767000	usd
CY2022Q3	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	15290000	usd
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	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	12594000	usd
	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	-59272000	usd
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CY2021Q3	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	221422000	usd
	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	674950000	usd
	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	687039000	usd
CY2022Q3	cbsh	Trustfeerevenue Trustfeerevenue	45406000	usd
CY2021Q3	cbsh	Trustfeerevenue Trustfeerevenue	48950000	usd
	cbsh	Trustfeerevenue Trustfeerevenue	140009000	usd
	cbsh	Trustfeerevenue Trustfeerevenue	139334000	usd
CY2022Q3	cbsh	Bank Card Transaction Fees BankCardTransactionFees	45638000	usd
CY2021Q3	cbsh	Bank Card Transaction Fees BankCardTransactionFees	42815000	usd
	cbsh	Bank Card Transaction Fees BankCardTransactionFees	131556000	usd
	cbsh	Bank Card Transaction Fees BankCardTransactionFees	123118000	usd
CY2022Q3	cbsh	Depositfeerevenue Depositfeerevenue	24521000	usd
CY2021Q3	cbsh	Depositfeerevenue Depositfeerevenue	25161000	usd
	cbsh	Depositfeerevenue Depositfeerevenue	72392000	usd
	cbsh	Depositfeerevenue Depositfeerevenue	71724000	usd
CY2022Q3	us-gaap	Brokerage Commissions Revenue BrokerageCommissionsRevenue	5085000	usd
CY2021Q3	us-gaap	Brokerage Commissions Revenue BrokerageCommissionsRevenue	4900000	usd
	us-gaap	Brokerage Commissions Revenue BrokerageCommissionsRevenue	14599000	usd
	us-gaap	Brokerage Commissions Revenue BrokerageCommissionsRevenue	13484000	usd
CY2022Q3	us-gaap	Noninterest Income Other NoninterestIncomeOther	3393000	usd
CY2021Q3	us-gaap	Noninterest Income Other NoninterestIncomeOther	3794000	usd
	us-gaap	Noninterest Income Other NoninterestIncomeOther	10845000	usd
	us-gaap	Noninterest Income Other NoninterestIncomeOther	12102000	usd
CY2022Q3	cbsh	Loan Fees And Sales LoanFeesAndSales	3094000	usd
CY2021Q3	cbsh	Loan Fees And Sales LoanFeesAndSales	6842000	usd
	cbsh	Loan Fees And Sales LoanFeesAndSales	10575000	usd
	cbsh	Loan Fees And Sales LoanFeesAndSales	24472000	usd
CY2022Q3	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	11377000	usd
CY2021Q3	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	5044000	usd
	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	29734000	usd
	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	28460000	usd
CY2022Q3	us-gaap	Noninterest Income NoninterestIncome	138514000	usd
CY2021Q3	us-gaap	Noninterest Income NoninterestIncome	137506000	usd
	us-gaap	Noninterest Income NoninterestIncome	409710000	usd
	us-gaap	Noninterest Income NoninterestIncome	412694000	usd
CY2022Q3	us-gaap	Gain Loss On Investments GainLossOnInvestments	3410000	usd
CY2021Q3	us-gaap	Gain Loss On Investments GainLossOnInvestments	13108000	usd
	us-gaap	Gain Loss On Investments GainLossOnInvestments	11602000	usd
	us-gaap	Gain Loss On Investments GainLossOnInvestments	39765000	usd
CY2022Q3	us-gaap	Labor And Related Expense LaborAndRelatedExpense	137393000	usd
CY2021Q3	us-gaap	Labor And Related Expense LaborAndRelatedExpense	132824000	usd
	us-gaap	Labor And Related Expense LaborAndRelatedExpense	415589000	usd
	us-gaap	Labor And Related Expense LaborAndRelatedExpense	392608000	usd
CY2022Q3	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	28050000	usd
CY2021Q3	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	25598000	usd
	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	82701000	usd
	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	76015000	usd
CY2022Q3	us-gaap	Occupancy Net OccupancyNet	12544000	usd
CY2021Q3	us-gaap	Occupancy Net OccupancyNet	12329000	usd
	us-gaap	Occupancy Net OccupancyNet	37343000	usd
	us-gaap	Occupancy Net OccupancyNet	35877000	usd
CY2022Q3	us-gaap	Equipment Expense EquipmentExpense	5036000	usd
CY2021Q3	us-gaap	Equipment Expense EquipmentExpense	4440000	usd
	us-gaap	Equipment Expense EquipmentExpense	14338000	usd
	us-gaap	Equipment Expense EquipmentExpense	13398000	usd
CY2022Q3	cbsh	Supplies Postage And Communication SuppliesPostageAndCommunication	4581000	usd
CY2021Q3	cbsh	Supplies Postage And Communication SuppliesPostageAndCommunication	4530000	usd
	cbsh	Supplies Postage And Communication SuppliesPostageAndCommunication	13655000	usd
	cbsh	Supplies Postage And Communication SuppliesPostageAndCommunication	12688000	usd
CY2022Q3	us-gaap	Marketing Expense MarketingExpense	6228000	usd
CY2021Q3	us-gaap	Marketing Expense MarketingExpense	5623000	usd
	us-gaap	Marketing Expense MarketingExpense	18408000	usd
	us-gaap	Marketing Expense MarketingExpense	16461000	usd
CY2022Q3	us-gaap	Other Noninterest Expense OtherNoninterestExpense	19052000	usd
CY2021Q3	us-gaap	Other Noninterest Expense OtherNoninterestExpense	26276000	usd
	us-gaap	Other Noninterest Expense OtherNoninterestExpense	50003000	usd
	us-gaap	Other Noninterest Expense OtherNoninterestExpense	55272000	usd
CY2022Q3	us-gaap	Noninterest Expense NoninterestExpense	212884000	usd
CY2021Q3	us-gaap	Noninterest Expense NoninterestExpense	211620000	usd
	us-gaap	Noninterest Expense NoninterestExpense	632037000	usd
	us-gaap	Noninterest Expense NoninterestExpense	602319000	usd
CY2022Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	160123000	usd
CY2021Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	160416000	usd
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	464225000	usd
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	537179000	usd
CY2022Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	33936000	usd
CY2021Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	34662000	usd
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	97859000	usd
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	111947000	usd
CY2022Q3	us-gaap	Profit Loss ProfitLoss	126187000	usd
CY2021Q3	us-gaap	Profit Loss ProfitLoss	125754000	usd
	us-gaap	Profit Loss ProfitLoss	366366000	usd
	us-gaap	Profit Loss ProfitLoss	425232000	usd
CY2022Q3	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	3364000	usd
CY2021Q3	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	3193000	usd
	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	9595000	usd
	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	9373000	usd
CY2022Q3	us-gaap	Net Income Loss NetIncomeLoss	122823000	usd
CY2021Q3	us-gaap	Net Income Loss NetIncomeLoss	122561000	usd
	us-gaap	Net Income Loss NetIncomeLoss	356771000	usd
	us-gaap	Net Income Loss NetIncomeLoss	415859000	usd
CY2022Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.03
CY2021Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.00
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.96
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.38
CY2022Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.02
CY2021Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.99
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.95
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.37
CY2022Q3	us-gaap	Profit Loss ProfitLoss	126187000	usd
CY2021Q3	us-gaap	Profit Loss ProfitLoss	125754000	usd
	us-gaap	Profit Loss ProfitLoss	366366000	usd
	us-gaap	Profit Loss ProfitLoss	425232000	usd
CY2022Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-345565000	usd
CY2021Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-57068000	usd
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-1181031000	usd
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-160019000	usd
CY2022Q3	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-302000	usd
CY2021Q3	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-451000	usd
	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-947000	usd
	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-1326000	usd
CY2022Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax	-7187000	usd
CY2021Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax	-4607000	usd
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax	-16340000	usd
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax	-13518000	usd
CY2022Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-352450000	usd
CY2021Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-61224000	usd
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-1196424000	usd
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-172211000	usd
CY2022Q3	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	-226263000	usd
CY2021Q3	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	64530000	usd
	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	-830058000	usd
	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	253021000	usd
CY2022Q3	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	3364000	usd
CY2021Q3	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	3193000	usd
	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	9595000	usd
	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	9373000	usd
CY2022Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-229627000	usd
CY2021Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	61337000	usd
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-839653000	usd
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	243648000	usd
CY2022Q2	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	2675313000	usd
CY2022Q3	us-gaap	Profit Loss ProfitLoss	126187000	usd
CY2022Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-352450000	usd
CY2022Q3	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	318000	usd
CY2022Q3	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	50116000	usd
CY2022Q3	cbsh	Stock Issued During Period Rs As And Sa Rs StockIssuedDuringPeriodRSAsAndSARs	1000	usd
CY2022Q3	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	4232000	usd
CY2022Q3	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.265
CY2022Q3	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	31740000	usd
CY2022Q3	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	2371107000	usd
CY2021Q2	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	3493830000	usd
	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	12641000	usd
CY2021Q3	us-gaap	Profit Loss ProfitLoss	125754000	usd
CY2021Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-61224000	usd
CY2021Q3	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	193000	usd
CY2021Q3	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	40165000	usd
CY2021Q3	us-gaap	Noncontrolling Interest Increase From Sale Of Parent Equity Interest NoncontrollingInterestIncreaseFromSaleOfParentEquityInterest	0	usd
CY2021Q3	cbsh	Stock Issued During Period Rs As And Sa Rs StockIssuedDuringPeriodRSAsAndSARs	1000	usd
CY2021Q3	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	3865000	usd
CY2021Q3	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.250
CY2021Q3	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	30645000	usd
CY2021Q3	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	3491221000	usd
CY2021Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	3448324000	usd
	us-gaap	Profit Loss ProfitLoss	366366000	usd
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-1196424000	usd
	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	1108000	usd
	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	163321000	usd
	cbsh	Stock Issued During Period Rs As And Sa Rs StockIssuedDuringPeriodRSAsAndSARs	-447000	usd
	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.795
	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	95818000	usd
CY2022Q3	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	2371107000	usd
CY2020Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	3399972000	usd
	us-gaap	Profit Loss ProfitLoss	425232000	usd
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-172211000	usd
	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	1088000	usd
	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	80052000	usd
	us-gaap	Noncontrolling Interest Increase From Sale Of Parent Equity Interest NoncontrollingInterestIncreaseFromSaleOfParentEquityInterest	0	usd
	cbsh	Stock Issued During Period Rs As And Sa Rs StockIssuedDuringPeriodRSAsAndSARs	16000	usd
	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	11588000	usd
	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.750
	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	92204000	usd
CY2021Q3	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	3491221000	usd
	us-gaap	Profit Loss ProfitLoss	366366000	usd
	us-gaap	Profit Loss ProfitLoss	425232000	usd
	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	12594000	usd
	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	-59272000	usd
	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	35350000	usd
	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	33554000	usd
	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	-8565000	usd
	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	-51822000	usd
	us-gaap	Gain Loss On Investments GainLossOnInvestments	11602000	usd
	us-gaap	Gain Loss On Investments GainLossOnInvestments	39765000	usd
	us-gaap	Gain Loss On Sale Of Loans And Leases GainLossOnSaleOfLoansAndLeases	2607000	usd
	us-gaap	Gain Loss On Sale Of Loans And Leases GainLossOnSaleOfLoansAndLeases	18849000	usd
	cbsh	Origination Of Loans Held For Sale OriginationOfLoansHeldForSale	114765000	usd
	cbsh	Origination Of Loans Held For Sale OriginationOfLoansHeldForSale	442853000	usd
	us-gaap	Proceeds From Sale Of Loans Held For Sale ProceedsFromSaleOfLoansHeldForSale	116421000	usd
	us-gaap	Proceeds From Sale Of Loans Held For Sale ProceedsFromSaleOfLoansHeldForSale	485231000	usd
	us-gaap	Increase Decrease In Trading Securities IncreaseDecreaseInTradingSecurities	-14080000	usd
	us-gaap	Increase Decrease In Trading Securities IncreaseDecreaseInTradingSecurities	9093000	usd
	cbsh	Purchase Of Interest Rate Floor PurchaseOfInterestRateFloor	-16849000	usd
	cbsh	Purchase Of Interest Rate Floor PurchaseOfInterestRateFloor	0	usd
	us-gaap	Share Based Compensation ShareBasedCompensation	12641000	usd
	us-gaap	Share Based Compensation ShareBasedCompensation	11588000	usd
	us-gaap	Increase Decrease In Interest And Dividends Receivable IncreaseDecreaseInInterestAndDividendsReceivable	21959000	usd
	us-gaap	Increase Decrease In Interest And Dividends Receivable IncreaseDecreaseInInterestAndDividendsReceivable	-11449000	usd
	us-gaap	Increase Decrease In Interest Payable Net IncreaseDecreaseInInterestPayableNet	1097000	usd
	us-gaap	Increase Decrease In Interest Payable Net IncreaseDecreaseInInterestPayableNet	-3168000	usd
	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	168000	usd
	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	19831000	usd
	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	-70285000	usd
	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	-20418000	usd
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	469785000	usd
CY2021Q4	us-gaap	Real Estate Acquired Through Foreclosure RealEstateAcquiredThroughForeclosure	115000	usd
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	486125000	usd
	us-gaap	Proceeds From Equity Method Investment Dividends Or Distributions Return Of Capital ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital	400000	usd
	us-gaap	Proceeds From Equity Method Investment Dividends Or Distributions Return Of Capital ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital	13540000	usd
	cbsh	Cash Proceeds From Sales Of Investment Securities CashProceedsFromSalesOfInvestmentSecurities	55690000	usd
	cbsh	Cash Proceeds From Sales Of Investment Securities CashProceedsFromSalesOfInvestmentSecurities	10060000	usd
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	2079939000	usd
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	2571116000	usd
	us-gaap	Payments To Acquire Investments PaymentsToAcquireInvestments	1951694000	usd
	us-gaap	Payments To Acquire Investments PaymentsToAcquireInvestments	4457716000	usd
	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	736474000	usd
	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	-1166769000	usd
	us-gaap	Payments For Securities Purchased Under Agreements To Resell PaymentsForSecuritiesPurchasedUnderAgreementsToResell	200000000	usd
	us-gaap	Payments For Securities Purchased Under Agreements To Resell PaymentsForSecuritiesPurchasedUnderAgreementsToResell	900000000	usd
	us-gaap	Proceeds From Securities Purchased Under Agreements To Resell ProceedsFromSecuritiesPurchasedUnderAgreementsToResell	550000000	usd
	us-gaap	Proceeds From Securities Purchased Under Agreements To Resell ProceedsFromSecuritiesPurchasedUnderAgreementsToResell	0	usd
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	46636000	usd
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	37385000	usd
	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	1613000	usd
	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	4786000	usd
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-247162000	usd
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-1628830000	usd
	cbsh	Net Increase Decrease Non Interest Bearing Savings Interest Checking And Money Market Deposits NetIncreaseDecreaseNonInterestBearingSavingsInterestCheckingAndMoneyMarketDeposits	-2078327000	usd
	cbsh	Net Increase Decrease Non Interest Bearing Savings Interest Checking And Money Market Deposits NetIncreaseDecreaseNonInterestBearingSavingsInterestCheckingAndMoneyMarketDeposits	1428561000	usd
	us-gaap	Increase Decrease In Time Deposits IncreaseDecreaseInTimeDeposits	-454376000	usd
	us-gaap	Increase Decrease In Time Deposits IncreaseDecreaseInTimeDeposits	-228916000	usd
	us-gaap	Increase Decrease In Federal Funds Purchased And Securities Sold Under Agreements To Repurchase Net IncreaseDecreaseInFederalFundsPurchasedAndSecuritiesSoldUnderAgreementsToRepurchaseNet	-708377000	usd
	us-gaap	Increase Decrease In Federal Funds Purchased And Securities Sold Under Agreements To Repurchase Net IncreaseDecreaseInFederalFundsPurchasedAndSecuritiesSoldUnderAgreementsToRepurchaseNet	155370000	usd
	cbsh	Net Increase Decrease In Short Term Borrowings NetIncreaseDecreaseInShortTermBorrowings	-10729000	usd
	cbsh	Net Increase Decrease In Short Term Borrowings NetIncreaseDecreaseInShortTermBorrowings	3204000	usd
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	163321000	usd
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	80052000	usd
	cbsh	Paymentsforstockvalueissuedundersharebasedcompensationplans Paymentsforstockvalueissuedundersharebasedcompensationplans	-447000	usd
CY2022Q3	us-gaap	Other Foreclosed Assets OtherForeclosedAssets	1700000	usd
	cbsh	Paymentsforstockvalueissuedundersharebasedcompensationplans Paymentsforstockvalueissuedundersharebasedcompensationplans	16000	usd
	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	95818000	usd
	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	92204000	usd
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-3510501000	usd
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	1185947000	usd
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	-3287878000	usd
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	43242000	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
CY2022Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	1009076000	usd
CY2021Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	2251570000	usd
	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	92646000	usd
	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	87989000	usd
	us-gaap	Interest Paid Net InterestPaidNet	23961000	usd
	us-gaap	Interest Paid Net InterestPaidNet	13213000	usd
	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	457000	usd
	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	172000	usd
CY2022Q3	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	7900000	usd
CY2021Q3	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	18600000	usd
CY2022Q3	us-gaap	Loans And Leases Receivable Gross Carrying Amount LoansAndLeasesReceivableGrossCarryingAmount	15898958000	usd
CY2021Q4	us-gaap	Loans And Leases Receivable Gross Carrying Amount LoansAndLeasesReceivableGrossCarryingAmount	15176359000	usd
CY2022Q3	us-gaap	Interest Receivable InterestReceivable	46200000	usd
CY2021Q4	us-gaap	Interest Receivable InterestReceivable	25900000	usd
CY2022Q3	cbsh	Pledged Financial Instruments Not Separately Reported Loans Receivable For Federal Home Loan Bank Debt PledgedFinancialInstrumentsNotSeparatelyReportedLoansReceivableForFederalHomeLoanBankDebt	3100000000	usd
CY2022Q3	cbsh	Pledged Financial Instruments Not Separately Reported Loans Receivable For Federal Reserve Bank Debt PledgedFinancialInstrumentsNotSeparatelyReportedLoansReceivableForFederalReserveBankDebt	1300000000	usd
CY2022Q2	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	138039000	usd
CY2021Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	150044000	usd
CY2022Q3	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	10150000	usd
	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	6751000	usd
CY2022Q3	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	7230000	usd
	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	21432000	usd
CY2022Q3	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	2418000	usd
	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	8014000	usd
CY2022Q3	us-gaap	Financing Receivable Allowance For Credit Loss Writeoff After Recovery FinancingReceivableAllowanceForCreditLossWriteoffAfterRecovery	4812000	usd
	us-gaap	Financing Receivable Allowance For Credit Loss Writeoff After Recovery FinancingReceivableAllowanceForCreditLossWriteoffAfterRecovery	13418000	usd
CY2022Q3	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	143377000	usd
CY2022Q3	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	143377000	usd
CY2022Q2	us-gaap	Off Balance Sheet Credit Loss Liability OffBalanceSheetCreditLossLiability	24907000	usd
CY2021Q4	us-gaap	Off Balance Sheet Credit Loss Liability OffBalanceSheetCreditLossLiability	24204000	usd
CY2022Q3	us-gaap	Off Balance Sheet Credit Loss Liability Credit Loss Expense Reversal OffBalanceSheetCreditLossLiabilityCreditLossExpenseReversal	5140000	usd
	us-gaap	Off Balance Sheet Credit Loss Liability Credit Loss Expense Reversal OffBalanceSheetCreditLossLiabilityCreditLossExpenseReversal	5843000	usd
CY2022Q3	us-gaap	Off Balance Sheet Credit Loss Liability OffBalanceSheetCreditLossLiability	30047000	usd
CY2022Q3	us-gaap	Off Balance Sheet Credit Loss Liability OffBalanceSheetCreditLossLiability	30047000	usd
CY2022Q3	cbsh	Financing Receivable Allowance For Credit Loss And Unfunded Lending Commitments Total FinancingReceivableAllowanceForCreditLossAndUnfundedLendingCommitmentsTotal	173424000	usd
CY2022Q3	cbsh	Financing Receivable Allowance For Credit Loss And Unfunded Lending Commitments Total FinancingReceivableAllowanceForCreditLossAndUnfundedLendingCommitmentsTotal	173424000	usd
CY2021Q2	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	172395000	usd
CY2020Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	220834000	usd
CY2021Q3	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	-5961000	usd
	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	-43749000	usd
CY2021Q3	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	6577000	usd
	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	28386000	usd
CY2021Q3	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	2918000	usd
	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	14076000	usd
CY2021Q3	us-gaap	Financing Receivable Allowance For Credit Loss Writeoff After Recovery FinancingReceivableAllowanceForCreditLossWriteoffAfterRecovery	3659000	usd
	us-gaap	Financing Receivable Allowance For Credit Loss Writeoff After Recovery FinancingReceivableAllowanceForCreditLossWriteoffAfterRecovery	14310000	usd
CY2021Q3	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	162775000	usd
CY2021Q3	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	162775000	usd
CY2021Q2	us-gaap	Off Balance Sheet Credit Loss Liability OffBalanceSheetCreditLossLiability	24208000	usd
CY2020Q4	us-gaap	Off Balance Sheet Credit Loss Liability OffBalanceSheetCreditLossLiability	38307000	usd
CY2021Q3	us-gaap	Off Balance Sheet Credit Loss Liability Credit Loss Expense Reversal OffBalanceSheetCreditLossLiabilityCreditLossExpenseReversal	-1424000	usd
	us-gaap	Off Balance Sheet Credit Loss Liability Credit Loss Expense Reversal OffBalanceSheetCreditLossLiabilityCreditLossExpenseReversal	-15523000	usd
CY2021Q3	us-gaap	Off Balance Sheet Credit Loss Liability OffBalanceSheetCreditLossLiability	22784000	usd
CY2021Q3	us-gaap	Off Balance Sheet Credit Loss Liability OffBalanceSheetCreditLossLiability	22784000	usd
CY2021Q3	cbsh	Financing Receivable Allowance For Credit Loss And Unfunded Lending Commitments Total FinancingReceivableAllowanceForCreditLossAndUnfundedLendingCommitmentsTotal	185559000	usd
CY2021Q3	cbsh	Financing Receivable Allowance For Credit Loss And Unfunded Lending Commitments Total FinancingReceivableAllowanceForCreditLossAndUnfundedLendingCommitmentsTotal	185559000	usd
CY2022Q3	cbsh	Financing Receivable Recorded Investment Currentor Lessthan30days Past Due FinancingReceivableRecordedInvestmentCurrentorLessthan30daysPastDue	15808125000	usd
CY2022Q3	cbsh	Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due FinancingReceivableRecordedInvestmentThirtyToEightyNineDaysPastDue	71111000	usd
CY2022Q3	us-gaap	Financing Receivable Recorded Investment90 Days Past Due And Still Accruing FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing	12538000	usd
CY2022Q3	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	7184000	usd
CY2022Q3	us-gaap	Loans And Leases Receivable Gross Carrying Amount LoansAndLeasesReceivableGrossCarryingAmount	15898958000	usd
CY2021Q4	cbsh	Financing Receivable Recorded Investment Currentor Lessthan30days Past Due FinancingReceivableRecordedInvestmentCurrentorLessthan30daysPastDue	15116475000	usd
CY2021Q4	cbsh	Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due FinancingReceivableRecordedInvestmentThirtyToEightyNineDaysPastDue	39001000	usd
CY2021Q4	us-gaap	Financing Receivable Recorded Investment90 Days Past Due And Still Accruing FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing	11726000	usd
CY2021Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	9157000	usd
CY2021Q4	us-gaap	Loans And Leases Receivable Gross Carrying Amount LoansAndLeasesReceivableGrossCarryingAmount	15176359000	usd
CY2022Q3	cbsh	Credit Quality Personal Real Estate Loans Excluded CreditQualityPersonalRealEstateLoansExcluded	186800000	usd
CY2021Q4	cbsh	Credit Quality Personal Real Estate Loans Excluded CreditQualityPersonalRealEstateLoansExcluded	185600000	usd
CY2022Q3	cbsh	Consumer Healthcare Loans Excluded ConsumerHealthcareLoansExcluded	197700000	usd
CY2021Q4	cbsh	Consumer Healthcare Loans Excluded ConsumerHealthcareLoansExcluded	186600000	usd
CY2022Q3	cbsh	Credit Quality Personal Banking Loan Table Percentage Loans Excluded CreditQualityPersonalBankingLoanTablePercentageLoansExcluded	0.07	rate
CY2022Q3	us-gaap	Financing Receivable Modifications Recorded Investment FinancingReceivableModificationsRecordedInvestment	155581000	usd
CY2021Q4	us-gaap	Financing Receivable Modifications Recorded Investment FinancingReceivableModificationsRecordedInvestment	64887000	usd
	cbsh	Period After Which Loans Are Deemed In Default PeriodAfterWhichLoansAreDeemedInDefault	P90D
CY2022Q3	us-gaap	Financing Receivable Modifications Recorded Investment FinancingReceivableModificationsRecordedInvestment	155581000	usd
CY2022Q3	cbsh	Financing Receivable Troubled Debt Restructurings That Subsequently Defaulted Recorded Investment FinancingReceivableTroubledDebtRestructuringsThatSubsequentlyDefaultedRecordedInvestment	1287000	usd
	cbsh	Effect On Interest Income Resulting From Modification To Credit Card Loans EffectOnInterestIncomeResultingFromModificationToCreditCardLoans	663000	usd
CY2022Q3	us-gaap	Loans And Leases Receivable Impaired Commitment To Lend LoansAndLeasesReceivableImpairedCommitmentToLend	22000000	usd
CY2022Q3	cbsh	Letters Of Credit To Customers With Substandard Risk Rating LettersOfCreditToCustomersWithSubstandardRiskRating	24000000	usd
CY2022Q3	us-gaap	Mortgages Held For Sale Fair Value Disclosure MortgagesHeldForSaleFairValueDisclosure	1400000	usd
CY2022Q3	cbsh	Unpaid Principal Balanceon Personal Real Estate Loans Heldfor Sale UnpaidPrincipalBalanceonPersonalRealEstateLoansHeldforSale	1500000	usd
CY2022Q3	cbsh	Student Loans Heldfor Sale Lowerof Costor Fair Value StudentLoansHeldforSaleLowerofCostorFairValue	6600000	usd
CY2022Q3	cbsh	Hfs Loansonnonaccrualstatus HFSLoansonnonaccrualstatus	0	usd
CY2022Q3	cbsh	Loans Held For Sale90 Days Past Dueand Still Accruing LoansHeldForSale90DaysPastDueandStillAccruing	0	usd
CY2022Q3	us-gaap	Real Estate Acquired Through Foreclosure RealEstateAcquiredThroughForeclosure	354000	usd
CY2021Q4	us-gaap	Other Foreclosed Assets OtherForeclosedAssets	1100000	usd
CY2022Q3	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	12632510000	usd
CY2021Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	14450027000	usd
CY2022Q3	us-gaap	Trading Securities TradingSecurities	39222000	usd
CY2021Q4	us-gaap	Trading Securities TradingSecurities	46235000	usd
CY2022Q3	us-gaap	Equity Securities Fv Ni EquitySecuritiesFvNi	6106000	usd
CY2021Q4	us-gaap	Equity Securities Fv Ni EquitySecuritiesFvNi	7153000	usd
CY2022Q3	cbsh	Equtiy Securitieswithout Readily Determinable Fair Values EqutiySecuritieswithoutReadilyDeterminableFairValues	2848000	usd
CY2021Q4	cbsh	Equtiy Securitieswithout Readily Determinable Fair Values EqutiySecuritieswithoutReadilyDeterminableFairValues	2049000	usd
CY2022Q3	us-gaap	Federal Reserve Bank Stock FederalReserveBankStock	34707000	usd
CY2021Q4	us-gaap	Federal Reserve Bank Stock FederalReserveBankStock	34379000	usd
CY2022Q3	us-gaap	Federal Home Loan Bank Stock FederalHomeLoanBankStock	10260000	usd
CY2021Q4	us-gaap	Federal Home Loan Bank Stock FederalHomeLoanBankStock	10428000	usd
CY2022Q3	us-gaap	Equity Method Investments EquityMethodInvestments	1434000	usd
CY2021Q4	us-gaap	Equity Method Investments EquityMethodInvestments	1834000	usd
CY2022Q3	cbsh	Private Equity Investments PrivateEquityInvestments	176341000	usd
CY2021Q4	cbsh	Private Equity Investments PrivateEquityInvestments	147406000	usd
CY2022Q3	cbsh	Total Investment Securities TotalInvestmentSecurities	12903428000	usd
CY2021Q4	cbsh	Total Investment Securities TotalInvestmentSecurities	14699511000	usd
CY2022Q3	us-gaap	Interest Receivable Current InterestReceivableCurrent	39600000	usd
CY2021Q4	us-gaap	Interest Receivable Current InterestReceivableCurrent	39500000	usd
CY2022Q3	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	14176324000	usd
CY2022Q3	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	12632510000	usd
	cbsh	Percentage Decrease In Fair Value Below Amortized Cost PercentageDecreaseInFairValueBelowAmortizedCost	0.20
CY2022Q3	cbsh	Fair Value Securities On Impairment Watch List FairValueSecuritiesOnImpairmentWatchList	1300000000	usd
CY2021Q4	cbsh	Fair Value Securities On Impairment Watch List FairValueSecuritiesOnImpairmentWatchList	13400000	usd
CY2022Q3	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	6657214000	usd
CY2022Q3	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	534096000	usd
CY2022Q3	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	5823641000	usd
CY2022Q3	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	1010292000	usd
CY2022Q3	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	12480855000	usd
CY2022Q3	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	1544388000	usd
CY2021Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	8581829000	usd
CY2021Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	118680000	usd
CY2021Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	465833000	usd
CY2021Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	14249000	usd
CY2021Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	9047662000	usd
CY2021Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	132929000	usd
CY2022Q3	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	12500000000	usd
CY2021Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	9000000000	usd
CY2022Q3	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	1500000000	usd
	cbsh	Af Ssecuritiesinlosspositionatperiodendchangeinunrealizedloss AFSsecuritiesinlosspositionatperiodendchangeinunrealizedloss	1400000000	usd
CY2022Q3	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	14176324000	usd
CY2022Q3	cbsh	Available For Sale Securities Gross Unreailzed Gainat Period End AvailableForSaleSecuritiesGrossUnreailzedGainatPeriodEnd	574000	usd
CY2022Q3	cbsh	Available For Sale Securities Gross Unrealized Lossat Period End AvailableForSaleSecuritiesGrossUnrealizedLossatPeriodEnd	1544388000	usd
CY2022Q3	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss DebtSecuritiesAvailableForSaleAllowanceForCreditLoss	0	usd
CY2022Q3	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	12632510000	usd
CY2021Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	14419133000	usd
CY2021Q4	cbsh	Available For Sale Securities Gross Unreailzed Gainat Period End AvailableForSaleSecuritiesGrossUnreailzedGainatPeriodEnd	163823000	usd
CY2021Q4	cbsh	Available For Sale Securities Gross Unrealized Lossat Period End AvailableForSaleSecuritiesGrossUnrealizedLossatPeriodEnd	132929000	usd
CY2021Q4	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss DebtSecuritiesAvailableForSaleAllowanceForCreditLoss	0	usd
CY2021Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	14450027000	usd
	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	85023000	usd
	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	0	usd
	cbsh	Proceeds From Sale Of Other Securities ProceedsFromSaleOfOtherSecurities	3907000	usd
	cbsh	Proceeds From Sale Of Other Securities ProceedsFromSaleOfOtherSecurities	10060000	usd
	cbsh	Proceedsfromsalesandmaturitiesofavailableforsaledebtequityandothersecurities Proceedsfromsalesandmaturitiesofavailableforsaledebtequityandothersecurities	88930000	usd
	cbsh	Proceedsfromsalesandmaturitiesofavailableforsaledebtequityandothersecurities Proceedsfromsalesandmaturitiesofavailableforsaledebtequityandothersecurities	10060000	usd
	us-gaap	Gain Loss On Investments GainLossOnInvestments	11602000	usd
	us-gaap	Gain Loss On Investments GainLossOnInvestments	39765000	usd
CY2022Q3	cbsh	Investment Securities Pledged At Fair Value InvestmentSecuritiesPledgedAtFairValue	4800000000	usd
CY2021Q4	cbsh	Investment Securities Pledged At Fair Value InvestmentSecuritiesPledgedAtFairValue	6400000000	usd
CY2022Q3	cbsh	Investments Exceeding Ten Percent Of Stockholders Equity InvestmentsExceedingTenPercentOfStockholdersEquity	0
CY2022Q3	cbsh	Percentage Of Stockholders Equity Of Which No Investment From Single Issuer Exceeds PercentageOfStockholdersEquityOfWhichNoInvestmentFromSingleIssuerExceeds	0.10
CY2022Q3	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	53431000	usd
CY2022Q3	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	41432000	usd
CY2022Q3	us-gaap	Valuation Allowances And Reserves Balance ValuationAllowancesAndReservesBalance	0	usd
CY2022Q3	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	11999000	usd
CY2021Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	52140000	usd
CY2021Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	39866000	usd
CY2021Q4	us-gaap	Valuation Allowances And Reserves Balance ValuationAllowancesAndReservesBalance	304000	usd
CY2021Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	11970000	usd
CY2022Q3	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	456000	usd
CY2021Q3	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	682000	usd
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	1600000	usd
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	2400000	usd
CY2022Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	1945000	usd
CY2022Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	1389000	usd
CY2022Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	1242000	usd
CY2022Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	1098000	usd
CY2022Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	960000	usd
	us-gaap	Sales Type And Direct Financing Leases Profit Loss SalesTypeAndDirectFinancingLeasesProfitLoss	17398000	usd
CY2022Q3	us-gaap	Operating Lease Lease Income OperatingLeaseLeaseIncome	2175000	usd
CY2021Q3	us-gaap	Operating Lease Lease Income OperatingLeaseLeaseIncome	1717000	usd
CY2021Q4	us-gaap	Goodwill Goodwill	138921000	usd
CY2022Q3	us-gaap	Goodwill Goodwill	138921000	usd
CY2022Q3	us-gaap	Sales Type And Direct Financing Leases Profit Loss SalesTypeAndDirectFinancingLeasesProfitLoss	5477000	usd
CY2021Q3	us-gaap	Sales Type And Direct Financing Leases Profit Loss SalesTypeAndDirectFinancingLeasesProfitLoss	5482000	usd
	us-gaap	Sales Type And Direct Financing Leases Profit Loss SalesTypeAndDirectFinancingLeasesProfitLoss	15838000	usd
	us-gaap	Operating Lease Lease Income OperatingLeaseLeaseIncome	6517000	usd
	us-gaap	Operating Lease Lease Income OperatingLeaseLeaseIncome	5721000	usd
CY2022Q3	us-gaap	Lease Income LeaseIncome	7652000	usd
CY2021Q3	us-gaap	Lease Income LeaseIncome	7199000	usd
	us-gaap	Lease Income LeaseIncome	22355000	usd
	us-gaap	Lease Income LeaseIncome	23119000	usd
CY2022Q3	us-gaap	Defined Benefit Plan Service Cost DefinedBenefitPlanServiceCost	128000	usd
CY2021Q3	us-gaap	Defined Benefit Plan Service Cost DefinedBenefitPlanServiceCost	95000	usd
	us-gaap	Defined Benefit Plan Service Cost DefinedBenefitPlanServiceCost	391000	usd
	us-gaap	Defined Benefit Plan Service Cost DefinedBenefitPlanServiceCost	284000	usd
CY2022Q3	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	713000	usd
CY2021Q3	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	514000	usd
	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	2043000	usd
	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	1626000	usd
CY2022Q3	us-gaap	Defined Benefit Plan Expected Return On Plan Assets DefinedBenefitPlanExpectedReturnOnPlanAssets	1135000	usd
CY2021Q3	us-gaap	Defined Benefit Plan Expected Return On Plan Assets DefinedBenefitPlanExpectedReturnOnPlanAssets	1151000	usd
	us-gaap	Defined Benefit Plan Expected Return On Plan Assets DefinedBenefitPlanExpectedReturnOnPlanAssets	3386000	usd
	us-gaap	Defined Benefit Plan Expected Return On Plan Assets DefinedBenefitPlanExpectedReturnOnPlanAssets	3399000	usd
CY2022Q3	us-gaap	Defined Benefit Plan Amortization Of Prior Service Cost Credit DefinedBenefitPlanAmortizationOfPriorServiceCostCredit	-68000	usd
CY2021Q3	us-gaap	Defined Benefit Plan Amortization Of Prior Service Cost Credit DefinedBenefitPlanAmortizationOfPriorServiceCostCredit	-67000	usd
	us-gaap	Defined Benefit Plan Amortization Of Prior Service Cost Credit DefinedBenefitPlanAmortizationOfPriorServiceCostCredit	-203000	usd
	us-gaap	Defined Benefit Plan Amortization Of Prior Service Cost Credit DefinedBenefitPlanAmortizationOfPriorServiceCostCredit	-203000	usd
CY2022Q3	us-gaap	Defined Benefit Plan Amortization Of Gains Losses DefinedBenefitPlanAmortizationOfGainsLosses	-470000	usd
CY2021Q3	us-gaap	Defined Benefit Plan Amortization Of Gains Losses DefinedBenefitPlanAmortizationOfGainsLosses	-669000	usd
	us-gaap	Defined Benefit Plan Amortization Of Gains Losses DefinedBenefitPlanAmortizationOfGainsLosses	-1465000	usd
	us-gaap	Defined Benefit Plan Amortization Of Gains Losses DefinedBenefitPlanAmortizationOfGainsLosses	-1971000	usd
CY2022Q3	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	108000	usd
CY2021Q3	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	60000	usd
	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	310000	usd
	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	279000	usd
	us-gaap	Defined Benefit Plan Contributions By Employer DefinedBenefitPlanContributionsByEmployer	0	usd
CY2022Q3	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	167000	shares
CY2021Q3	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	99000	shares
	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	152000	shares
	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	61000	shares
CY2021Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	77080000	usd
	us-gaap	Other Comprehensive Income Loss Before Reclassifications Before Tax OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax	-1598445000	usd
	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Before Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax	-3214000	usd
	us-gaap	Other Comprehensive Income Loss Before Tax OtherComprehensiveIncomeLossBeforeTax	-1595231000	usd
	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	-398807000	usd
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-1196424000	usd
CY2022Q3	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-1119344000	usd
CY2020Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	331377000	usd
	us-gaap	Other Comprehensive Income Loss Before Reclassifications Before Tax OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax	-213362000	usd
	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Before Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax	16256000	usd
	us-gaap	Other Comprehensive Income Loss Before Tax OtherComprehensiveIncomeLossBeforeTax	-229618000	usd
	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	-57407000	usd
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-172211000	usd
CY2021Q3	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	159166000	usd
CY2022Q3	us-gaap	Number Of Operating Segments NumberOfOperatingSegments	3	operating_segments
	us-gaap	Number Of Operating Segments NumberOfOperatingSegments	3	operating_segments
CY2022Q3	cbsh	Number Of Locations NumberOfLocations	150	locations
CY2021Q3	us-gaap	Revenues Revenues	0	usd
CY2022Q3	us-gaap	Revenues Revenues	0	usd
	us-gaap	Revenues Revenues	0	usd
	us-gaap	Revenues Revenues	0	usd
CY2022Q3	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	246373000	usd
CY2022Q3	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	15290000	usd
CY2022Q3	us-gaap	Noninterest Income NoninterestIncome	138514000	usd
CY2022Q3	us-gaap	Gain Loss On Investments GainLossOnInvestments	3410000	usd
CY2022Q3	us-gaap	Noninterest Expense NoninterestExpense	212884000	usd
CY2022Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	160123000	usd
	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	687544000	usd
	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	12594000	usd
	us-gaap	Noninterest Income NoninterestIncome	409710000	usd
	us-gaap	Gain Loss On Investments GainLossOnInvestments	11602000	usd
	us-gaap	Noninterest Expense NoninterestExpense	632037000	usd
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	464225000	usd
CY2021Q3	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	214037000	usd
CY2021Q3	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	-7385000	usd
CY2021Q3	us-gaap	Noninterest Income NoninterestIncome	137506000	usd
CY2021Q3	us-gaap	Gain Loss On Investments GainLossOnInvestments	13108000	usd
CY2021Q3	us-gaap	Noninterest Expense NoninterestExpense	211620000	usd
CY2021Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	160416000	usd
	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	627767000	usd
	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	-59272000	usd
	us-gaap	Noninterest Income NoninterestIncome	412694000	usd
	us-gaap	Gain Loss On Investments GainLossOnInvestments	39765000	usd
	us-gaap	Noninterest Expense NoninterestExpense	602319000	usd
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	537179000	usd
CY2022Q3	us-gaap	Derivative Notional Amount DerivativeNotionalAmount	3179428000	usd
CY2021Q4	us-gaap	Derivative Notional Amount DerivativeNotionalAmount	2916181000	usd
CY2022Q3	us-gaap	Derivative Assets DerivativeAssets	38460000	usd
CY2021Q4	us-gaap	Derivative Assets DerivativeAssets	41842000	usd
CY2022Q3	us-gaap	Derivative Liabilities DerivativeLiabilities	55768000	usd
CY2021Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	12101000	usd
CY2022Q3	us-gaap	Gain Loss On Derivative Instruments Net Pretax GainLossOnDerivativeInstrumentsNetPretax	105000	usd
CY2021Q3	us-gaap	Gain Loss On Derivative Instruments Net Pretax GainLossOnDerivativeInstrumentsNetPretax	-454000	usd
	us-gaap	Gain Loss On Derivative Instruments Net Pretax GainLossOnDerivativeInstrumentsNetPretax	2839000	usd
	us-gaap	Gain Loss On Derivative Instruments Net Pretax GainLossOnDerivativeInstrumentsNetPretax	2056000	usd
CY2022Q3	us-gaap	Derivative Asset Fair Value Gross Asset Including Not Subject To Master Netting Arrangement DerivativeAssetFairValueGrossAssetIncludingNotSubjectToMasterNettingArrangement	38460000	usd
CY2022Q3	cbsh	Derivative Asset Amount Offset By Liabiilty DerivativeAssetAmountOffsetByLiabiilty	0	usd
CY2022Q3	us-gaap	Derivative Assets DerivativeAssets	38460000	usd
CY2022Q3	us-gaap	Derivative Liability Fair Value Gross Liability Including Not Subject To Master Netting Arrangement DerivativeLiabilityFairValueGrossLiabilityIncludingNotSubjectToMasterNettingArrangement	55768000	usd
CY2022Q3	cbsh	Derivative Liability Amount Offset By Asset DerivativeLiabilityAmountOffsetByAsset	0	usd
CY2022Q3	us-gaap	Derivative Liabilities DerivativeLiabilities	55768000	usd
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate	0.015
CY2021Q4	us-gaap	Derivative Asset Fair Value Gross Asset Including Not Subject To Master Netting Arrangement DerivativeAssetFairValueGrossAssetIncludingNotSubjectToMasterNettingArrangement	41842000	usd
CY2021Q4	cbsh	Derivative Asset Amount Offset By Liabiilty DerivativeAssetAmountOffsetByLiabiilty	0	usd
CY2021Q4	us-gaap	Derivative Assets DerivativeAssets	41842000	usd
CY2021Q4	us-gaap	Derivative Liability Fair Value Gross Liability Including Not Subject To Master Netting Arrangement DerivativeLiabilityFairValueGrossLiabilityIncludingNotSubjectToMasterNettingArrangement	12101000	usd
CY2021Q4	cbsh	Derivative Liability Amount Offset By Asset DerivativeLiabilityAmountOffsetByAsset	0	usd
CY2021Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	12101000	usd
CY2022Q3	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	4200000	usd
CY2021Q3	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	3900000	usd
	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	12600000	usd
	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	11600000	usd
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate	0.284
CY2021Q4	cbsh	Nonvested Share Awards Balances NonvestedShareAwardsBalances	1120491	shares
CY2021Q4	cbsh	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Nonvested Share Awards Weighted Average Grant Date Unit Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsNonvestedShareAwardsWeightedAverageGrantDateUnitFairValue	55.58
	cbsh	Nonvested Share Awards Granted In Period NonvestedShareAwardsGrantedInPeriod	263497	shares
	cbsh	Share Based Compensation Granted Nonvested Share Award Weighted Average Grant Date Fair Value ShareBasedCompensationGrantedNonvestedShareAwardWeightedAverageGrantDateFairValue	70.76
	cbsh	Nonvested Share Awards Vested In Period NonvestedShareAwardsVestedInPeriod	262579	shares
	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	47.78
	cbsh	Nonvested Share Awards Forfeited In Period NonvestedShareAwardsForfeitedInPeriod	23145	shares
	cbsh	Share Based Compensation Forfeited Nonvested Share Award Weighted Average Grant Date Fair Value ShareBasedCompensationForfeitedNonvestedShareAwardWeightedAverageGrantDateFairValue	60.08
CY2022Q3	cbsh	Nonvested Share Awards Balances NonvestedShareAwardsBalances	1098264	shares
CY2022Q3	cbsh	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Nonvested Share Awards Weighted Average Grant Date Unit Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsNonvestedShareAwardsWeightedAverageGrantDateUnitFairValue	61.00
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	17.42
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate	0.016
	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Fair Value Assumptions Expected Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1	P5Y8M12D
CY2021Q4	cbsh	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Number ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNumber	896348	shares
CY2021Q4	cbsh	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsWeightedAverageExercisePrice	46.21
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod	96318	shares
	cbsh	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageExercisePrice	70.64
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeited In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod	8135	shares
	cbsh	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeited In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriodWeightedAverageExercisePrice	61.68
	cbsh	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Expired In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpiredInPeriod	2350	shares
	cbsh	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Expired In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpiredInPeriodWeightedAverageExercisePrice	56.68
	cbsh	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Exercised In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisedInPeriod	66608	shares
	cbsh	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Exercised In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisedInPeriodWeightedAverageExercisePrice	40.54
CY2022Q3	cbsh	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Number ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNumber	915573	shares
CY2022Q3	cbsh	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsWeightedAverageExercisePrice	49.02
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Outstanding Weighted Average Remaining Contractual Terms ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageRemainingContractualTerms	P5Y6M
CY2022Q3	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Equity Instruments Other Than Options Aggregate Intrinsic Value Outstanding SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueOutstanding	16367000	usd
	cbsh	Percentof Revenuenotinscopeof Asc606 PercentofRevenuenotinscopeofASC606	0.63
CY2022Q3	us-gaap	Noninterest Income NoninterestIncome	138514000	usd
CY2021Q3	us-gaap	Noninterest Income NoninterestIncome	137506000	usd
	us-gaap	Noninterest Income NoninterestIncome	409710000	usd
	us-gaap	Noninterest Income NoninterestIncome	412694000	usd
CY2022Q3	us-gaap	Mortgages Held For Sale Fair Value Disclosure MortgagesHeldForSaleFairValueDisclosure	1426000	usd
CY2022Q3	us-gaap	Financial Instruments Owned Us Government And Agency Obligations At Fair Value FinancialInstrumentsOwnedUSGovernmentAndAgencyObligationsAtFairValue	1036325000	usd
CY2022Q3	cbsh	Us Government Sponsored Enterprises Debt Securities USGovernmentSponsoredEnterprisesDebtSecurities	43175000	usd
CY2022Q3	us-gaap	Financial Instruments Owned State And Municipal Government Obligations At Fair Value FinancialInstrumentsOwnedStateAndMunicipalGovernmentObligationsAtFairValue	1803253000	usd
CY2022Q3	cbsh	Financial Instruments Owned Agency Mortgage Backed Securities At Fair Value FinancialInstrumentsOwnedAgencyMortgageBackedSecuritiesAtFairValue	4445519000	usd
CY2022Q3	cbsh	Financial Instruments Owned Non Agency Mortgage Backed Securities At Fair Value FinancialInstrumentsOwnedNonAgencyMortgageBackedSecuritiesAtFairValue	1235584000	usd
CY2022Q3	cbsh	Other Asset Backed Securities Disclosure OtherAssetBackedSecuritiesDisclosure	3558287000	usd
CY2022Q3	cbsh	Financial Instruments Owned Other Debt Securities At Fair Value FinancialInstrumentsOwnedOtherDebtSecuritiesAtFairValue	510367000	usd
CY2022Q3	us-gaap	Trading Securities TradingSecurities	39222000	usd
CY2022Q3	us-gaap	Equity Securities Fv Ni EquitySecuritiesFvNi	6106000	usd
CY2022Q3	us-gaap	Financial Instruments Owned Principal Investments At Fair Value FinancialInstrumentsOwnedPrincipalInvestmentsAtFairValue	176341000	usd
CY2022Q3	us-gaap	Derivative Assets DerivativeAssets	38460000	usd
CY2022Q3	us-gaap	Deferred Compensation Plan Assets DeferredCompensationPlanAssets	16588000	usd
CY2022Q3	us-gaap	Assets Fair Value Disclosure AssetsFairValueDisclosure	12910653000	usd
CY2022Q3	us-gaap	Derivative Liabilities DerivativeLiabilities	55768000	usd
CY2022Q3	us-gaap	Deferred Compensation Liability Current And Noncurrent DeferredCompensationLiabilityCurrentAndNoncurrent	16588000	usd
CY2022Q3	us-gaap	Liabilities Fair Value Disclosure LiabilitiesFairValueDisclosure	72356000	usd
CY2021Q4	us-gaap	Mortgages Held For Sale Fair Value Disclosure MortgagesHeldForSaleFairValueDisclosure	5570000	usd
CY2021Q4	us-gaap	Financial Instruments Owned Us Government And Agency Obligations At Fair Value FinancialInstrumentsOwnedUSGovernmentAndAgencyObligationsAtFairValue	1080720000	usd
CY2021Q4	cbsh	Us Government Sponsored Enterprises Debt Securities USGovernmentSponsoredEnterprisesDebtSecurities	51755000	usd
CY2021Q4	us-gaap	Financial Instruments Owned State And Municipal Government Obligations At Fair Value FinancialInstrumentsOwnedStateAndMunicipalGovernmentObligationsAtFairValue	2096827000	usd
CY2021Q4	cbsh	Financial Instruments Owned Agency Mortgage Backed Securities At Fair Value FinancialInstrumentsOwnedAgencyMortgageBackedSecuritiesAtFairValue	5683000000	usd
CY2021Q4	cbsh	Financial Instruments Owned Non Agency Mortgage Backed Securities At Fair Value FinancialInstrumentsOwnedNonAgencyMortgageBackedSecuritiesAtFairValue	1366477000	usd
CY2021Q4	cbsh	Other Asset Backed Securities Disclosure OtherAssetBackedSecuritiesDisclosure	3539219000	usd
CY2021Q4	cbsh	Financial Instruments Owned Other Debt Securities At Fair Value FinancialInstrumentsOwnedOtherDebtSecuritiesAtFairValue	632029000	usd
CY2021Q4	us-gaap	Trading Securities TradingSecurities	46235000	usd
CY2021Q4	us-gaap	Equity Securities Fv Ni EquitySecuritiesFvNi	7153000	usd
CY2021Q4	us-gaap	Financial Instruments Owned Principal Investments At Fair Value FinancialInstrumentsOwnedPrincipalInvestmentsAtFairValue	147406000	usd
CY2021Q4	us-gaap	Derivative Assets DerivativeAssets	41842000	usd
CY2021Q4	us-gaap	Deferred Compensation Plan Assets DeferredCompensationPlanAssets	21794000	usd
CY2021Q4	us-gaap	Assets Fair Value Disclosure AssetsFairValueDisclosure	14720027000	usd
CY2021Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	12101000	usd
CY2021Q4	us-gaap	Deferred Compensation Liability Current And Noncurrent DeferredCompensationLiabilityCurrentAndNoncurrent	21794000	usd
CY2021Q4	us-gaap	Liabilities Fair Value Disclosure LiabilitiesFairValueDisclosure	33895000	usd
CY2022Q2	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	163741000	usd
CY2022Q3	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Earnings1 FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1	-13942000	usd
CY2022Q3	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Other Comprehensive Income Loss FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss	40000	usd
CY2022Q3	cbsh	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Discount Accretion FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetDiscountAccretion	2000	usd
CY2022Q3	cbsh	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Purchase Of Private Equity Securities FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchaseOfPrivateEquitySecurities	899000	usd
CY2022Q3	cbsh	Sales And Repayments Of Private Equity Securities SalesAndRepaymentsOfPrivateEquitySecurities	423000	usd
CY2022Q3	cbsh	Capitalized Interest Or Dividends CapitalizedInterestOrDividends	44000	usd
CY2022Q3	cbsh	Sale Of Risk Participation Agreement SaleOfRiskParticipationAgreement	104000	usd
CY2022Q3	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	178141000	usd
CY2022Q3	cbsh	Change In Unrealized Gains Or Losses Related To Assets Held Level3 Fair Value Measurements ChangeInUnrealizedGainsOrLossesRelatedToAssetsHeldLevel3FairValueMeasurements	14172000	usd
CY2022Q3	cbsh	Gains Losses Included In Oci Attributable To Change In Unrealized Gains Losses Relating To Assets Still Held Total GainsLossesIncludedInOCIAttributableToChangeInUnrealizedGainsLossesRelatingToAssetsStillHeldTotal	40000	usd
CY2021Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	149961000	usd
	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Earnings1 FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1	-36399000	usd
	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Other Comprehensive Income Loss FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss	-130000	usd
	cbsh	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Discount Accretion FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetDiscountAccretion	4000	usd
	cbsh	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Purchase Of Private Equity Securities FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchaseOfPrivateEquitySecurities	2021000	usd
	cbsh	Sales And Repayments Of Private Equity Securities SalesAndRepaymentsOfPrivateEquitySecurities	10263000	usd
	cbsh	Capitalized Interest Or Dividends CapitalizedInterestOrDividends	44000	usd
	cbsh	Purchase Of Risk Participation Agreement PurchaseOfRiskParticipationAgreement	459000	usd
	cbsh	Sale Of Risk Participation Agreement SaleOfRiskParticipationAgreement	354000	usd
CY2022Q3	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	178141000	usd
	cbsh	Change In Unrealized Gains Or Losses Related To Assets Held Level3 Fair Value Measurements ChangeInUnrealizedGainsOrLossesRelatedToAssetsHeldLevel3FairValueMeasurements	37111000	usd
	cbsh	Gains Losses Included In Oci Attributable To Change In Unrealized Gains Losses Relating To Assets Still Held Total GainsLossesIncludedInOCIAttributableToChangeInUnrealizedGainsLossesRelatingToAssetsStillHeldTotal	-130000	usd
CY2021Q2	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	125866000	usd
CY2021Q3	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Earnings1 FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1	-12709000	usd
CY2021Q3	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Other Comprehensive Income Loss FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss	-175000	usd
CY2021Q3	cbsh	Investment Securities Called InvestmentSecuritiesCalled	6000000	usd
CY2021Q3	cbsh	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Discount Accretion FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetDiscountAccretion	179000	usd
CY2021Q3	cbsh	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Purchase Of Private Equity Securities FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchaseOfPrivateEquitySecurities	8835000	usd
CY2021Q3	cbsh	Sale Of Risk Participation Agreement SaleOfRiskParticipationAgreement	27000	usd
CY2021Q3	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	141387000	usd
CY2021Q3	cbsh	Change In Unrealized Gains Or Losses Related To Assets Held Level3 Fair Value Measurements ChangeInUnrealizedGainsOrLossesRelatedToAssetsHeldLevel3FairValueMeasurements	14528000	usd
CY2021Q3	cbsh	Gains Losses Included In Oci Attributable To Change In Unrealized Gains Losses Relating To Assets Still Held Total GainsLossesIncludedInOCIAttributableToChangeInUnrealizedGainsLossesRelatingToAssetsStillHeldTotal	2000	usd
CY2020Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	105077000	usd
	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Earnings1 FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1	-36313000	usd
	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Other Comprehensive Income Loss FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss	-158000	usd
	cbsh	Investment Securities Called InvestmentSecuritiesCalled	6000000	usd
	cbsh	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Discount Accretion FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetDiscountAccretion	185000	usd
	cbsh	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Purchase Of Private Equity Securities FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchaseOfPrivateEquitySecurities	14491000	usd
	cbsh	Sales And Repayments Of Private Equity Securities SalesAndRepaymentsOfPrivateEquitySecurities	8832000	usd
	cbsh	Capitalized Interest Or Dividends CapitalizedInterestOrDividends	23000	usd
	cbsh	Purchase Of Risk Participation Agreement PurchaseOfRiskParticipationAgreement	445000	usd
	cbsh	Sale Of Risk Participation Agreement SaleOfRiskParticipationAgreement	157000	usd
CY2021Q3	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	141387000	usd
	cbsh	Change In Unrealized Gains Or Losses Related To Assets Held Level3 Fair Value Measurements ChangeInUnrealizedGainsOrLossesRelatedToAssetsHeldLevel3FairValueMeasurements	39369000	usd
	cbsh	Gains Losses Included In Oci Attributable To Change In Unrealized Gains Losses Relating To Assets Still Held Total GainsLossesIncludedInOCIAttributableToChangeInUnrealizedGainsLossesRelatingToAssetsStillHeldTotal	23000	usd
CY2022Q3	cbsh	Total Gains Or Losses Included In Earnings Level3 Fair Measurements TotalGainsOrLossesIncludedInEarningsLevel3FairMeasurements	13942000	usd
CY2022Q3	cbsh	Change In Unrealized Gains Or Losses Related To Assets Held Level3 Fair Value Measurements ChangeInUnrealizedGainsOrLossesRelatedToAssetsHeldLevel3FairValueMeasurements	14172000	usd
	cbsh	Total Gains Or Losses Included In Earnings Level3 Fair Measurements TotalGainsOrLossesIncludedInEarningsLevel3FairMeasurements	36399000	usd
	cbsh	Change In Unrealized Gains Or Losses Related To Assets Held Level3 Fair Value Measurements ChangeInUnrealizedGainsOrLossesRelatedToAssetsHeldLevel3FairValueMeasurements	37111000	usd
CY2021Q3	cbsh	Total Gains Or Losses Included In Earnings Level3 Fair Measurements TotalGainsOrLossesIncludedInEarningsLevel3FairMeasurements	12709000	usd
CY2021Q3	cbsh	Change In Unrealized Gains Or Losses Related To Assets Held Level3 Fair Value Measurements ChangeInUnrealizedGainsOrLossesRelatedToAssetsHeldLevel3FairValueMeasurements	14528000	usd
	cbsh	Total Gains Or Losses Included In Earnings Level3 Fair Measurements TotalGainsOrLossesIncludedInEarningsLevel3FairMeasurements	36313000	usd
	cbsh	Change In Unrealized Gains Or Losses Related To Assets Held Level3 Fair Value Measurements ChangeInUnrealizedGainsOrLossesRelatedToAssetsHeldLevel3FairValueMeasurements	39369000	usd
CY2022Q3	cbsh	Loans Nonrecurring Basis LoansNonrecurringBasis	200000	usd
	cbsh	Loans Nonrecurring Basis Gains Losses LoansNonrecurringBasisGainsLosses	-394000	usd
CY2022Q3	cbsh	Mortgage Servicing Rights Nonrecurring Basis MortgageServicingRightsNonrecurringBasis	11228000	usd
	cbsh	Mortgage Servicing Rights Nonrecurring Basis Gains Losses MortgageServicingRightsNonrecurringBasisGainsLosses	304000	usd
CY2022Q3	cbsh	Long Lived Assets Nonrecurring Basis LongLivedAssetsNonrecurringBasis	480000	usd
	cbsh	Long Lived Assets Nonrecurring Basis Gains Losses LongLivedAssetsNonrecurringBasisGainsLosses	-965000	usd
CY2021Q3	cbsh	Loans Nonrecurring Basis LoansNonrecurringBasis	2057000	usd
	cbsh	Loans Nonrecurring Basis Gains Losses LoansNonrecurringBasisGainsLosses	-349000	usd
CY2021Q3	cbsh	Mortgage Servicing Rights Nonrecurring Basis MortgageServicingRightsNonrecurringBasis	9774000	usd
	cbsh	Mortgage Servicing Rights Nonrecurring Basis Gains Losses MortgageServicingRightsNonrecurringBasisGainsLosses	1120000	usd
CY2021Q3	cbsh	Long Lived Assets Nonrecurring Basis LongLivedAssetsNonrecurringBasis	1393000	usd
	cbsh	Long Lived Assets Nonrecurring Basis Gains Losses LongLivedAssetsNonrecurringBasisGainsLosses	-726000	usd
	cbsh	Fair Value Discounted Cash Flow Valuation Techniques FairValueDiscountedCashFlowValuationTechniques	Discounted cash flow

Files In Submission

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$CBSH
COMMERCE BANCSHARES INC /MO/ Stock $cbsh

2022 Q4 Form 10-Q Financial Statement

#000002235622000051 Filed on November 04, 2022

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$CBSH COMMERCE BANCSHARES INC /MO/ Stock $cbsh

2022 Q4 Form 10-Q Financial Statement

#000002235622000051 Filed on November 04, 2022

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$CBSH
COMMERCE BANCSHARES INC /MO/ Stock $cbsh