$CBSH
COMMERCE BANCSHARES INC /MO/ Stock $cbsh

$cbsh Overview Financials Valuation SEC Filings Company Website

2024 Q3 Form 10-Q Financial Statement

#000002235624000047 Filed on August 06, 2024

Income Statement

Concept	2024 Q3	2024 Q2
Revenue	$372.1M	$369.4M
YoY Change	3.02%	5.94%
Cost Of Revenue
YoY Change
Gross Profit
YoY Change
Gross Profit Margin
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$13.71M	$13.53M
YoY Change	9.7%	7.4%
% of Gross Profit
Operating Expenses
YoY Change
Operating Profit
YoY Change
Interest Expense		$107.1M
YoY Change		8.06%
% of Operating Profit
Other Income/Expense, Net
YoY Change
Pretax Income	$178.5M	$180.0M
YoY Change	14.33%	8.17%
Income Tax	$38.25M	$38.60M
% Of Pretax Income	21.42%	21.44%
Net Earnings	$138.0M	$139.6M
YoY Change	14.44%	9.21%
Net Earnings / Revenue	37.09%	37.78%
Basic Earnings Per Share	$1.07	$1.07
Diluted Earnings Per Share	$1.07	$1.07
COMMON SHARES
Basic Shares Outstanding	128.9M shares	129.5M shares
Diluted Shares Outstanding

Balance Sheet

Concept	2024 Q3	2024 Q2
SHORT-TERM ASSETS
Cash & Short-Term Investments
YoY Change
Cash & Equivalents	$3.150B	$2.545B
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	$470.0M	$467.3M
YoY Change	1.99%	3.47%
Goodwill	$146.5M	$146.5M
YoY Change	0.0%	0.11%
Intangibles	$13.72M	$13.80M
YoY Change	-4.92%	-5.9%
Long-Term Investments
YoY Change
Other Assets
YoY Change
Total Long-Term Assets
YoY Change
TOTAL ASSETS
Total Short-Term Assets
Total Long-Term Assets
Total Assets	$31.49B	$30.57B
YoY Change	0.37%	-6.89%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable
YoY Change
Accrued Expenses
YoY Change
Deferred Revenue
YoY Change
Short-Term Debt	$2.182B	$2.551B
YoY Change	-20.5%	-11.35%
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$2.182B	$2.551B
YoY Change	-20.5%	-11.35%
LONG-TERM LIABILITIES
Long-Term Debt	$10.20M	$3.984M
YoY Change	155.03%	-99.6%
Other Long-Term Liabilities	$609.8M	$576.4M
YoY Change	39.23%	46.68%
Total Long-Term Liabilities	$620.0M	$580.4M
YoY Change	40.28%	-58.5%
TOTAL LIABILITIES
Total Short-Term Liabilities	$2.182B	$2.551B
Total Long-Term Liabilities	$620.0M	$580.4M
Total Liabilities	$28.04B	$27.41B
YoY Change	-2.56%	-9.07%
SHAREHOLDERS EQUITY
Retained Earnings	$338.5M	$235.3M
YoY Change	13.48%	11.33%
Common Stock	$655.3M	$655.3M
YoY Change	4.13%	4.13%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$139.1M	$98.18M
YoY Change	80.98%	68.14%
Treasury Stock Shares
Shareholders Equity	$3.432B	$3.138B
YoY Change
Total Liabilities & Shareholders Equity	$31.49B	$30.57B
YoY Change	0.37%	-6.89%

Cashflow Statement

Concept	2024 Q3	2024 Q2
OPERATING ACTIVITIES
Net Income	$138.0M	$139.6M
YoY Change	14.44%	9.21%
Depreciation, Depletion And Amortization	$13.71M	$13.53M
YoY Change	9.7%	7.4%
Cash From Operating Activities	$431.7M	$147.4M
YoY Change	194.06%	40.57%
INVESTING ACTIVITIES
Capital Expenditures	$12.61M	$8.506M
YoY Change	-39.08%	-73.3%
Acquisitions
YoY Change
Other Investing Activities	-$224.4M	$673.2M
YoY Change	-137.51%	136.66%
Cash From Investing Activities	-$237.0M	$664.7M
YoY Change	-141.03%	163.14%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	410.6M	-168.0M
YoY Change	-128.24%	-119.52%
NET CHANGE
Cash From Operating Activities	431.7M	147.4M
Cash From Investing Activities	-237.0M	664.7M
Cash From Financing Activities	410.6M	-168.0M
Net Change In Cash	605.3M	644.1M
YoY Change	-182.94%	-47.13%
FREE CASH FLOW
Cash From Operating Activities	$431.7M	$147.4M
Capital Expenditures	$12.61M	$8.506M
Free Cash Flow	$419.1M	$138.9M
YoY Change	232.33%	90.29%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2024Q2	us-gaap	Interest Expense InterestExpense	107114000	usd
CY2023Q2	us-gaap	Interest Expense InterestExpense	99125000	usd
	us-gaap	Interest Expense InterestExpense	216836000	usd
	us-gaap	Interest Expense InterestExpense	156359000	usd
	us-gaap	Noninterest Income Other NoninterestIncomeOther	8652000	usd
CY2024Q2	us-gaap	Loans And Leases Receivable Gross Carrying Amount LoansAndLeasesReceivableGrossCarryingAmount	17163065000	usd
CY2023Q4	us-gaap	Loans And Leases Receivable Gross Carrying Amount LoansAndLeasesReceivableGrossCarryingAmount	17205479000	usd
CY2023Q4	us-gaap	Interest Receivable InterestReceivable	71900000	usd
CY2024Q2	us-gaap	Interest Receivable InterestReceivable	71900000	usd
CY2024Q2	cbsh	Pledged Financial Instruments Not Separately Reported Loans Receivable For Federal Home Loan Bank Debt PledgedFinancialInstrumentsNotSeparatelyReportedLoansReceivableForFederalHomeLoanBankDebt	3600000000	usd
CY2024Q2	cbsh	Pledged Financial Instruments Not Separately Reported Loans Receivable For Federal Reserve Bank Debt PledgedFinancialInstrumentsNotSeparatelyReportedLoansReceivableForFederalReserveBankDebt	2900000000	usd
CY2024Q1	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	160465000	usd
CY2023Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	162395000	usd
CY2024Q2	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	7849000	usd
	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	14796000	usd
CY2024Q2	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	11868000	usd
	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	23033000	usd
CY2024Q2	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	2111000	usd
	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	4399000	usd
CY2024Q2	us-gaap	Financing Receivable Allowance For Credit Loss Writeoff After Recovery FinancingReceivableAllowanceForCreditLossWriteoffAfterRecovery	9757000	usd
	us-gaap	Financing Receivable Allowance For Credit Loss Writeoff After Recovery FinancingReceivableAllowanceForCreditLossWriteoffAfterRecovery	18634000	usd
CY2024Q2	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	158557000	usd
CY2024Q2	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	158557000	usd
CY2024Q1	us-gaap	Off Balance Sheet Credit Loss Liability OffBalanceSheetCreditLossLiability	23086000	usd
CY2023Q4	us-gaap	Off Balance Sheet Credit Loss Liability OffBalanceSheetCreditLossLiability	25246000	usd
CY2024Q2	us-gaap	Off Balance Sheet Credit Loss Liability Credit Loss Expense Reversal OffBalanceSheetCreditLossLiabilityCreditLossExpenseReversal	-2381000	usd
	us-gaap	Off Balance Sheet Credit Loss Liability Credit Loss Expense Reversal OffBalanceSheetCreditLossLiabilityCreditLossExpenseReversal	-4541000	usd
CY2024Q2	us-gaap	Off Balance Sheet Credit Loss Liability OffBalanceSheetCreditLossLiability	20705000	usd
CY2024Q2	us-gaap	Off Balance Sheet Credit Loss Liability OffBalanceSheetCreditLossLiability	20705000	usd
CY2024Q2	cbsh	Financing Receivable Allowance For Credit Loss And Unfunded Lending Commitments Total FinancingReceivableAllowanceForCreditLossAndUnfundedLendingCommitmentsTotal	179262000	usd
CY2024Q2	cbsh	Financing Receivable Allowance For Credit Loss And Unfunded Lending Commitments Total FinancingReceivableAllowanceForCreditLossAndUnfundedLendingCommitmentsTotal	179262000	usd
CY2023Q1	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	159317000	usd
CY2022Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	150136000	usd
CY2023Q2	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	5864000	usd
CY2023Q2	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	8838000	usd
	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	17886000	usd
CY2023Q2	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	2342000	usd
	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	4623000	usd
CY2023Q2	us-gaap	Financing Receivable Allowance For Credit Loss Writeoff After Recovery FinancingReceivableAllowanceForCreditLossWriteoffAfterRecovery	6496000	usd
	us-gaap	Financing Receivable Allowance For Credit Loss Writeoff After Recovery FinancingReceivableAllowanceForCreditLossWriteoffAfterRecovery	13263000	usd
CY2023Q2	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	158685000	usd
CY2023Q1	us-gaap	Off Balance Sheet Credit Loss Liability OffBalanceSheetCreditLossLiability	28628000	usd
CY2022Q4	us-gaap	Off Balance Sheet Credit Loss Liability OffBalanceSheetCreditLossLiability	33120000	usd
CY2023Q2	us-gaap	Off Balance Sheet Credit Loss Liability Credit Loss Expense Reversal OffBalanceSheetCreditLossLiabilityCreditLossExpenseReversal	607000	usd
	us-gaap	Off Balance Sheet Credit Loss Liability Credit Loss Expense Reversal OffBalanceSheetCreditLossLiabilityCreditLossExpenseReversal	-3885000	usd
CY2023Q2	us-gaap	Off Balance Sheet Credit Loss Liability OffBalanceSheetCreditLossLiability	29235000	usd
CY2023Q2	us-gaap	Off Balance Sheet Credit Loss Liability OffBalanceSheetCreditLossLiability	29235000	usd
CY2023Q2	cbsh	Financing Receivable Allowance For Credit Loss And Unfunded Lending Commitments Total FinancingReceivableAllowanceForCreditLossAndUnfundedLendingCommitmentsTotal	187920000	usd
CY2023Q2	cbsh	Financing Receivable Allowance For Credit Loss And Unfunded Lending Commitments Total FinancingReceivableAllowanceForCreditLossAndUnfundedLendingCommitmentsTotal	187920000	usd
CY2024Q2	cbsh	Financing Receivable Recorded Investment Currentor Lessthan30days Past Due FinancingReceivableRecordedInvestmentCurrentorLessthan30daysPastDue	17053186000	usd
CY2024Q2	cbsh	Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due FinancingReceivableRecordedInvestmentThirtyToEightyNineDaysPastDue	72010000	usd
CY2024Q2	us-gaap	Financing Receivable Recorded Investment90 Days Past Due And Still Accruing FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing	18566000	usd
CY2024Q2	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	19303000	usd
CY2024Q2	us-gaap	Loans And Leases Receivable Gross Carrying Amount LoansAndLeasesReceivableGrossCarryingAmount	17163065000	usd
CY2023Q4	cbsh	Financing Receivable Recorded Investment Currentor Lessthan30days Past Due FinancingReceivableRecordedInvestmentCurrentorLessthan30daysPastDue	17080238000	usd
CY2023Q4	cbsh	Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due FinancingReceivableRecordedInvestmentThirtyToEightyNineDaysPastDue	96065000	usd
CY2023Q4	us-gaap	Financing Receivable Recorded Investment90 Days Past Due And Still Accruing FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing	21864000	usd
CY2023Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	7312000	usd
CY2023Q4	us-gaap	Loans And Leases Receivable Gross Carrying Amount LoansAndLeasesReceivableGrossCarryingAmount	17205479000	usd
CY2024Q2	us-gaap	Brokerage Commissions Revenue BrokerageCommissionsRevenue	4478000	usd
CY2023Q2	us-gaap	Brokerage Commissions Revenue BrokerageCommissionsRevenue	4677000	usd
	us-gaap	Brokerage Commissions Revenue BrokerageCommissionsRevenue	8886000	usd
	us-gaap	Brokerage Commissions Revenue BrokerageCommissionsRevenue	9762000	usd
CY2024Q2	us-gaap	Noninterest Income Other NoninterestIncomeOther	4760000	usd
CY2023Q2	us-gaap	Noninterest Income Other NoninterestIncomeOther	2945000	usd
	us-gaap	Noninterest Income Other NoninterestIncomeOther	6307000	usd
	us-gaap	Equipment Expense EquipmentExpense	9714000	usd
	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	10255000	usd
	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	26800000	usd
	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	-1649000	usd
	us-gaap	Gain Loss On Investments GainLossOnInvestments	2974000	usd
	us-gaap	Gain Loss On Sale Of Loans And Leases GainLossOnSaleOfLoansAndLeases	988000	usd
	cbsh	Origination Of Loans Held For Sale OriginationOfLoansHeldForSale	43505000	usd
	us-gaap	Proceeds From Sale Of Loans Held For Sale ProceedsFromSaleOfLoansHeldForSale	45453000	usd
	us-gaap	Increase Decrease In Trading Securities IncreaseDecreaseInTradingSecurities	13589000	usd
	cbsh	Purchase Of Interest Rate Floor PurchaseOfInterestRateFloor	0	usd
	us-gaap	Share Based Compensation ShareBasedCompensation	8451000	usd
	us-gaap	Increase Decrease In Interest And Dividends Receivable IncreaseDecreaseInInterestAndDividendsReceivable	-2794000	usd
	us-gaap	Increase Decrease In Interest Payable Net IncreaseDecreaseInInterestPayableNet	-2303000	usd
	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	528000	usd
	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	6630000	usd
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	282835000	usd
	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	0	usd
	us-gaap	Proceeds From Equity Method Investment Dividends Or Distributions Return Of Capital ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital	0	usd
	cbsh	Cash Proceeds From Sales Of Investment Securities CashProceedsFromSalesOfInvestmentSecurities	1157176000	usd
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	1166452000	usd
	us-gaap	Payments To Acquire Investments PaymentsToAcquireInvestments	1100450000	usd
	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	-23692000	usd
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	19504000	usd
	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	3281000	usd
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	1205647000	usd
	cbsh	Net Increase Decrease Non Interest Bearing Savings Interest Checking And Money Market Deposits NetIncreaseDecreaseNonInterestBearingSavingsInterestCheckingAndMoneyMarketDeposits	-669259000	usd
	us-gaap	Increase Decrease In Federal Funds Purchased And Securities Sold Under Agreements To Repurchase Net IncreaseDecreaseInFederalFundsPurchasedAndSecuritiesSoldUnderAgreementsToRepurchaseNet	-357416000	usd
	us-gaap	Proceeds From Federal Home Loan Bank Borrowings ProceedsFromFederalHomeLoanBankBorrowings	0	usd
	us-gaap	Repayments Of Federal Home Loan Bank Borrowings RepaymentsOfFederalHomeLoanBankBorrowings	0	usd
	cbsh	Net Increase Decrease In Short Term Borrowings NetIncreaseDecreaseInShortTermBorrowings	2580000	usd
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	79889000	usd
	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	70100000	usd
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	678808000	usd
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	2040543000	usd
CY2024Q2	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	2544790000	usd
CY2023Q2	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	2938344000	usd
	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	64925000	usd
	us-gaap	Interest Paid Net InterestPaidNet	124540000	usd
	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	72000	usd
CY2023Q2	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	200000	usd
CY2024Q2	cbsh	Investment Securities Called InvestmentSecuritiesCalled	0	usd
	cbsh	Investment Securities Called InvestmentSecuritiesCalled	0	usd
CY2023Q2	cbsh	Investment Securities Called InvestmentSecuritiesCalled	0	usd
CY2023Q2	cbsh	Sales And Repayments Of Private Equity Securities SalesAndRepaymentsOfPrivateEquitySecurities	0	usd
	cbsh	Capitalized Interest Or Dividends CapitalizedInterestOrDividends	0	usd
	cbsh	Capitalized Interest Or Dividends CapitalizedInterestOrDividends	0	usd
CY2023Q2	cbsh	Equity Securities Nonrecurring Basis EquitySecuritiesNonrecurringBasis	0	usd
	cbsh	Equity Securities Nonrecurring Basis Gains Losses EquitySecuritiesNonrecurringBasisGainsLosses	0	usd
CY2024Q2	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	2354000	usd
CY2023Q2	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	4187000	usd
	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	10371000	usd
	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	8830000	usd
CY2024Q2	us-gaap	Equipment Expense EquipmentExpense	5091000	usd
CY2023Q2	us-gaap	Equipment Expense EquipmentExpense	4864000	usd
	us-gaap	Equipment Expense EquipmentExpense	10101000	usd
CY2024Q2	us-gaap	Marketing Expense MarketingExpense	5356000	usd
CY2023Q2	us-gaap	Marketing Expense MarketingExpense	6368000	usd
	us-gaap	Marketing Expense MarketingExpense	9392000	usd
	us-gaap	Marketing Expense MarketingExpense	11839000	usd
CY2024Q2	us-gaap	Other Noninterest Expense OtherNoninterestExpense	21584000	usd
CY2023Q2	us-gaap	Other Noninterest Expense OtherNoninterestExpense	20424000	usd
	us-gaap	Other Noninterest Expense OtherNoninterestExpense	48946000	usd
	us-gaap	Other Noninterest Expense OtherNoninterestExpense	39691000	usd
CY2024Q2	us-gaap	Noninterest Expense NoninterestExpense	232214000	usd
CY2023Q2	us-gaap	Noninterest Expense NoninterestExpense	227611000	usd
	us-gaap	Noninterest Expense NoninterestExpense	477911000	usd
	us-gaap	Noninterest Expense NoninterestExpense	451718000	usd
CY2024Q2	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	180044000	usd
CY2023Q2	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	166453000	usd
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	327148000	usd
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	319819000	usd
CY2024Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	38602000	usd
CY2023Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	35990000	usd
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	70254000	usd
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	68803000	usd
CY2024Q2	us-gaap	Profit Loss ProfitLoss	141442000	usd
CY2023Q2	us-gaap	Profit Loss ProfitLoss	130463000	usd
	us-gaap	Profit Loss ProfitLoss	256894000	usd
	us-gaap	Profit Loss ProfitLoss	251016000	usd
CY2024Q2	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	1889000	usd
CY2023Q2	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	2674000	usd
	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	4678000	usd
	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	3775000	usd
CY2024Q2	us-gaap	Net Income Loss NetIncomeLoss	139553000	usd
CY2023Q2	us-gaap	Net Income Loss NetIncomeLoss	127789000	usd
	us-gaap	Net Income Loss NetIncomeLoss	252216000	usd
	us-gaap	Net Income Loss NetIncomeLoss	247241000	usd
CY2024Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.07
CY2023Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.97
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.94
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.88
CY2024Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.07
CY2023Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.97
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.93
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.88
CY2024Q2	us-gaap	Profit Loss ProfitLoss	141442000	usd
CY2023Q2	us-gaap	Profit Loss ProfitLoss	130463000	usd
	us-gaap	Profit Loss ProfitLoss	256894000	usd
	us-gaap	Profit Loss ProfitLoss	251016000	usd
CY2024Q2	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	130076000	usd
CY2023Q2	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-81882000	usd
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	109675000	usd
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	60584000	usd
CY2024Q2	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-177000	usd
CY2023Q2	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-269000	usd
	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-353000	usd
	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-539000	usd
CY2024Q2	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax	-7043000	usd
CY2023Q2	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax	-14184000	usd
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax	-26433000	usd
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax	-10554000	usd
CY2024Q2	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	123210000	usd
CY2023Q2	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-95797000	usd
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	83595000	usd
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	50569000	usd
CY2024Q2	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	264652000	usd
CY2023Q2	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	34666000	usd
	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	340489000	usd
	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	301585000	usd
CY2024Q2	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	1889000	usd
CY2023Q2	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	2674000	usd
	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	4678000	usd
	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	3775000	usd
CY2024Q2	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	262763000	usd
CY2023Q2	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	31992000	usd
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	335811000	usd
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	297810000	usd
CY2024Q1	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	2963889000	usd
CY2024Q2	us-gaap	Profit Loss ProfitLoss	141442000	usd
CY2024Q2	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	123210000	usd
CY2024Q2	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	1202000	usd
CY2024Q2	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	38229000	usd
CY2024Q2	cbsh	Stock Issued During Period Rs As And Sa Rs StockIssuedDuringPeriodRSAsAndSARs	0	usd
CY2024Q2	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	4185000	usd
CY2024Q2	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.270
CY2024Q2	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	34960000	usd
CY2024Q2	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	3158335000	usd
CY2023Q1	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	2682412000	usd
CY2023Q2	us-gaap	Profit Loss ProfitLoss	130463000	usd
CY2023Q2	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-95797000	usd
CY2023Q2	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	1692000	usd
CY2023Q2	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	318000	usd
CY2023Q2	cbsh	Stock Issued During Period Rs As And Sa Rs StockIssuedDuringPeriodRSAsAndSARs	0	usd
CY2023Q2	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	3904000	usd
CY2023Q2	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.257
CY2023Q2	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	33744000	usd
CY2023Q2	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	2685228000	usd
	us-gaap	Profit Loss ProfitLoss	256894000	usd
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	83595000	usd
	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	4192000	usd
	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	80543000	usd
	cbsh	Stock Issued During Period Rs As And Sa Rs StockIssuedDuringPeriodRSAsAndSARs	0	usd
	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	8451000	usd
	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.540
	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	70100000	usd
CY2024Q2	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	3158335000	usd
	us-gaap	Profit Loss ProfitLoss	251016000	usd
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	50569000	usd
	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	2145000	usd
	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	36563000	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	0	usd
	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	8277000	usd
	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.514
	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	67503000	usd
CY2023Q2	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	2685228000	usd
	us-gaap	Profit Loss ProfitLoss	256894000	usd
	us-gaap	Profit Loss ProfitLoss	251016000	usd
	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	17927000	usd
	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	24164000	usd
	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	-9482000	usd
	us-gaap	Gain Loss On Investments GainLossOnInvestments	3086000	usd
	us-gaap	Gain Loss On Sale Of Loans And Leases GainLossOnSaleOfLoansAndLeases	422000	usd
	cbsh	Origination Of Loans Held For Sale OriginationOfLoansHeldForSale	25729000	usd
	us-gaap	Proceeds From Sale Of Loans Held For Sale ProceedsFromSaleOfLoansHeldForSale	24210000	usd
	us-gaap	Increase Decrease In Trading Securities IncreaseDecreaseInTradingSecurities	-17915000	usd
	cbsh	Purchase Of Interest Rate Floor PurchaseOfInterestRateFloor	-25900000	usd
	us-gaap	Share Based Compensation ShareBasedCompensation	8277000	usd
	us-gaap	Increase Decrease In Interest And Dividends Receivable IncreaseDecreaseInInterestAndDividendsReceivable	667000	usd
	us-gaap	Increase Decrease In Interest Payable Net IncreaseDecreaseInInterestPayableNet	31819000	usd
	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	-74000	usd
	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	108044000	usd
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	220888000	usd
	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	6197000	usd
	us-gaap	Proceeds From Equity Method Investment Dividends Or Distributions Return Of Capital ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital	1434000	usd
	cbsh	Cash Proceeds From Sales Of Investment Securities CashProceedsFromSalesOfInvestmentSecurities	1130536000	usd
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	922759000	usd
	us-gaap	Payments To Acquire Investments PaymentsToAcquireInvestments	190253000	usd
	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	666743000	usd
	us-gaap	Payments For Securities Purchased Under Agreements To Resell PaymentsForSecuritiesPurchasedUnderAgreementsToResell	350000000	usd
	us-gaap	Payments For Securities Purchased Under Agreements To Resell PaymentsForSecuritiesPurchasedUnderAgreementsToResell	0	usd
	us-gaap	Proceeds From Securities Purchased Under Agreements To Resell ProceedsFromSecuritiesPurchasedUnderAgreementsToResell	325000000	usd
	us-gaap	Proceeds From Securities Purchased Under Agreements To Resell ProceedsFromSecuritiesPurchasedUnderAgreementsToResell	0	usd
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	51904000	usd
	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	1215000	usd
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	1140847000	usd
	cbsh	Net Increase Decrease Non Interest Bearing Savings Interest Checking And Money Market Deposits NetIncreaseDecreaseNonInterestBearingSavingsInterestCheckingAndMoneyMarketDeposits	-2506872000	usd
	us-gaap	Increase Decrease In Time Deposits IncreaseDecreaseInTimeDeposits	-456891000	usd
	us-gaap	Increase Decrease In Time Deposits IncreaseDecreaseInTimeDeposits	2257518000	usd
	us-gaap	Increase Decrease In Federal Funds Purchased And Securities Sold Under Agreements To Repurchase Net IncreaseDecreaseInFederalFundsPurchasedAndSecuritiesSoldUnderAgreementsToRepurchaseNet	36287000	usd
	us-gaap	Proceeds From Federal Home Loan Bank Borrowings ProceedsFromFederalHomeLoanBankBorrowings	2250000000	usd
	us-gaap	Repayments Of Federal Home Loan Bank Borrowings RepaymentsOfFederalHomeLoanBankBorrowings	1250000000	usd
	cbsh	Net Increase Decrease In Short Term Borrowings NetIncreaseDecreaseInShortTermBorrowings	-4059000	usd
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	36563000	usd
	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	67503000	usd
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-1630975000	usd
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	-142493000	usd
CY2023Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	2687283000	usd
CY2022Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	897801000	usd
	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	65890000	usd
	us-gaap	Interest Paid Net InterestPaidNet	219139000	usd
	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	88000	usd
CY2024Q2	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	41000	usd
	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	21812000	usd
CY2023Q2	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	158685000	usd
CY2024Q2	us-gaap	Financing Receivable Nonaccrual No Allowance FinancingReceivableNonaccrualNoAllowance	2500000	usd
CY2023Q4	us-gaap	Financing Receivable Nonaccrual No Allowance FinancingReceivableNonaccrualNoAllowance	4300000	usd
CY2024Q2	cbsh	Collateral Dependent Loans Amortized Cost CollateralDependentLoansAmortizedCost	17549000	usd
CY2023Q4	cbsh	Collateral Dependent Loans Amortized Cost CollateralDependentLoansAmortizedCost	4398000	usd
CY2024Q2	cbsh	Credit Quality Personal Real Estate Loans Excluded CreditQualityPersonalRealEstateLoansExcluded	170100000	usd
CY2023Q4	cbsh	Credit Quality Personal Real Estate Loans Excluded CreditQualityPersonalRealEstateLoansExcluded	168900000	usd
CY2024Q2	cbsh	Consumer Healthcare Loans Excluded ConsumerHealthcareLoansExcluded	220500000	usd
CY2023Q4	cbsh	Consumer Healthcare Loans Excluded ConsumerHealthcareLoansExcluded	211300000	usd
CY2024Q2	cbsh	Credit Quality Personal Banking Loan Table Percentage Loans Excluded CreditQualityPersonalBankingLoanTablePercentageLoansExcluded	0.07	rate
CY2024Q2	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	67820000	usd
CY2024Q2	us-gaap	Financing Receivable Modification To Total Financing Receivables Percent FinancingReceivableModificationToTotalFinancingReceivablesPercent	0.004
	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	84706000	usd
	us-gaap	Financing Receivable Modification To Total Financing Receivables Percent FinancingReceivableModificationToTotalFinancingReceivablesPercent	0.005
CY2023Q2	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	53544000	usd
CY2023Q2	us-gaap	Financing Receivable Modification To Total Financing Receivables Percent FinancingReceivableModificationToTotalFinancingReceivablesPercent	0.003
	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	72732000	usd
	us-gaap	Financing Receivable Modification To Total Financing Receivables Percent FinancingReceivableModificationToTotalFinancingReceivablesPercent	0.004
CY2024Q2	us-gaap	Loans And Leases Receivable Impaired Commitment To Lend LoansAndLeasesReceivableImpairedCommitmentToLend	7000000	usd
CY2023Q4	us-gaap	Loans And Leases Receivable Impaired Commitment To Lend LoansAndLeasesReceivableImpairedCommitmentToLend	28400000	usd
CY2024Q2	cbsh	Period After Which Loans Are Deemed In Default PeriodAfterWhichLoansAreDeemedInDefault	P90D
CY2024Q2	us-gaap	Financing Receivable Modifications Subsequent Default Recorded Investment1 FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1	2113000	usd
	us-gaap	Financing Receivable Modifications Subsequent Default Recorded Investment1 FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1	2437000	usd
CY2023Q2	us-gaap	Financing Receivable Modifications Subsequent Default Recorded Investment1 FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1	930000	usd
	us-gaap	Financing Receivable Modifications Subsequent Default Recorded Investment1 FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1	979000	usd
CY2024Q2	cbsh	Financing Receivable Modified In The Previous12 Months Current FinancingReceivableModifiedInThePrevious12MonthsCurrent	111715000	usd
CY2024Q2	cbsh	Financing Receivable Modified In Previous12 Months Thirty To Eighty Nine Days Past Due FinancingReceivableModifiedInPrevious12MonthsThirtyToEightyNineDaysPastDue	2483000	usd
CY2024Q2	cbsh	Financing Receivable Modified In Previous12 Months Ninety Days Past Due FinancingReceivableModifiedInPrevious12MonthsNinetyDaysPastDue	2073000	usd
CY2024Q2	cbsh	Financing Receivable Modified In Previous12 Months Amount FinancingReceivableModifiedInPrevious12MonthsAmount	116271000	usd
CY2023Q2	cbsh	Financing Receivable Modified In The Previous12 Months Current FinancingReceivableModifiedInThePrevious12MonthsCurrent	71142000	usd
CY2023Q2	cbsh	Financing Receivable Modified In Previous12 Months Thirty To Eighty Nine Days Past Due FinancingReceivableModifiedInPrevious12MonthsThirtyToEightyNineDaysPastDue	660000	usd
CY2023Q2	cbsh	Financing Receivable Modified In Previous12 Months Ninety Days Past Due FinancingReceivableModifiedInPrevious12MonthsNinetyDaysPastDue	930000	usd
CY2023Q2	cbsh	Financing Receivable Modified In Previous12 Months Amount FinancingReceivableModifiedInPrevious12MonthsAmount	72732000	usd
CY2024Q2	us-gaap	Mortgages Held For Sale Fair Value Disclosure MortgagesHeldForSaleFairValueDisclosure	2200000	usd
CY2024Q2	cbsh	Unpaid Principal Balanceon Personal Real Estate Loans Heldfor Sale UnpaidPrincipalBalanceonPersonalRealEstateLoansHeldforSale	2200000	usd
CY2024Q2	cbsh	Student Loans Heldfor Sale Lowerof Costor Fair Value StudentLoansHeldforSaleLowerofCostorFairValue	448000	usd
CY2024Q2	cbsh	Hfs Loansonnonaccrualstatus HFSLoansonnonaccrualstatus	0	usd
CY2024Q2	cbsh	Loans Held For Sale90 Days Past Dueand Still Accruing LoansHeldForSale90DaysPastDueandStillAccruing	0	usd
CY2024Q2	us-gaap	Real Estate Acquired Through Foreclosure RealEstateAcquiredThroughForeclosure	143000	usd
CY2023Q4	us-gaap	Real Estate Acquired Through Foreclosure RealEstateAcquiredThroughForeclosure	270000	usd
CY2024Q2	cbsh	Residential Real Estate Acquired Through Foreclosure Through Obtaining Physical Possession ResidentialRealEstateAcquiredThroughForeclosureThroughObtainingPhysicalPossession	143000	usd
CY2023Q4	cbsh	Residential Real Estate Acquired Through Foreclosure Through Obtaining Physical Possession ResidentialRealEstateAcquiredThroughForeclosureThroughObtainingPhysicalPossession	270000	usd
CY2024Q2	us-gaap	Other Foreclosed Assets OtherForeclosedAssets	2200000	usd
CY2023Q4	us-gaap	Other Foreclosed Assets OtherForeclosedAssets	1800000	usd
CY2024Q2	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	8534271000	usd
CY2023Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	9684760000	usd
CY2024Q2	us-gaap	Trading Securities Debt TradingSecuritiesDebt	45499000	usd
CY2023Q4	us-gaap	Trading Securities Debt TradingSecuritiesDebt	28830000	usd
CY2024Q2	us-gaap	Equity Securities Fv Ni EquitySecuritiesFvNi	47804000	usd
CY2023Q4	us-gaap	Equity Securities Fv Ni EquitySecuritiesFvNi	5723000	usd
CY2024Q2	us-gaap	Equity Securities Without Readily Determinable Fair Value Amount EquitySecuritiesWithoutReadilyDeterminableFairValueAmount	65780000	usd
CY2023Q4	us-gaap	Equity Securities Without Readily Determinable Fair Value Amount EquitySecuritiesWithoutReadilyDeterminableFairValueAmount	6978000	usd
CY2024Q2	us-gaap	Federal Reserve Bank Stock FederalReserveBankStock	35361000	usd
CY2023Q4	us-gaap	Federal Reserve Bank Stock FederalReserveBankStock	35166000	usd
CY2024Q2	us-gaap	Federal Home Loan Bank Stock FederalHomeLoanBankStock	10116000	usd
CY2023Q4	us-gaap	Federal Home Loan Bank Stock FederalHomeLoanBankStock	10640000	usd
CY2024Q2	cbsh	Private Equity Investments PrivateEquityInvestments	178321000	usd
CY2023Q4	cbsh	Private Equity Investments PrivateEquityInvestments	176667000	usd
CY2024Q2	cbsh	Total Investment Securities TotalInvestmentSecurities	8917152000	usd
CY2023Q4	cbsh	Total Investment Securities TotalInvestmentSecurities	9948764000	usd
CY2024Q2	us-gaap	Interest Receivable Current InterestReceivableCurrent	26400000	usd
CY2023Q4	us-gaap	Interest Receivable Current InterestReceivableCurrent	28900000	usd
CY2024Q2	cbsh	Proceeds From Sale Of Equity Securities ProceedsFromSaleOfEquitySecurities	119800000	usd
CY2024Q1	us-gaap	Equity Securities Without Readily Determinable Fair Value Amount EquitySecuritiesWithoutReadilyDeterminableFairValueAmount	6988000	usd
CY2023Q4	us-gaap	Equity Securities Without Readily Determinable Fair Value Amount EquitySecuritiesWithoutReadilyDeterminableFairValueAmount	6978000	usd
CY2024Q2	us-gaap	Equity Securities Without Readily Determinable Fair Value Upward Price Adjustment Annual Amount EquitySecuritiesWithoutReadilyDeterminableFairValueUpwardPriceAdjustmentAnnualAmount	178227000	usd
	us-gaap	Equity Securities Without Readily Determinable Fair Value Upward Price Adjustment Annual Amount EquitySecuritiesWithoutReadilyDeterminableFairValueUpwardPriceAdjustmentAnnualAmount	178227000	usd
CY2024Q2	us-gaap	Equity Securities Without Readily Determinable Fair Value Downward Price Adjustment Annual Amount EquitySecuritiesWithoutReadilyDeterminableFairValueDownwardPriceAdjustmentAnnualAmount	0	usd
	us-gaap	Equity Securities Without Readily Determinable Fair Value Downward Price Adjustment Annual Amount EquitySecuritiesWithoutReadilyDeterminableFairValueDownwardPriceAdjustmentAnnualAmount	0	usd
CY2024Q2	us-gaap	Equity Securities Without Readily Determinable Fair Value Impairment Loss Annual Amount EquitySecuritiesWithoutReadilyDeterminableFairValueImpairmentLossAnnualAmount	0	usd
	us-gaap	Equity Securities Without Readily Determinable Fair Value Impairment Loss Annual Amount EquitySecuritiesWithoutReadilyDeterminableFairValueImpairmentLossAnnualAmount	0	usd
CY2024Q2	cbsh	Sales Of Equity Securities Without Readily Determinable Fair Value SalesOfEquitySecuritiesWithoutReadilyDeterminableFairValue	-119435000	usd
	cbsh	Sales Of Equity Securities Without Readily Determinable Fair Value SalesOfEquitySecuritiesWithoutReadilyDeterminableFairValue	-119425000	usd
CY2024Q2	us-gaap	Equity Securities Without Readily Determinable Fair Value Amount EquitySecuritiesWithoutReadilyDeterminableFairValueAmount	65780000	usd
CY2024Q2	us-gaap	Equity Securities Without Readily Determinable Fair Value Amount EquitySecuritiesWithoutReadilyDeterminableFairValueAmount	65780000	usd
CY2024Q2	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	9608044000	usd
CY2024Q2	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	8534271000	usd
	cbsh	Percentage Decrease In Fair Value Below Amortized Cost PercentageDecreaseInFairValueBelowAmortizedCost	0.20
CY2024Q2	cbsh	Fair Value Securities On Impairment Watch List FairValueSecuritiesOnImpairmentWatchList	1800000000	usd
CY2023Q4	cbsh	Fair Value Securities On Impairment Watch List FairValueSecuritiesOnImpairmentWatchList	1200000000	usd
CY2024Q2	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	658346000	usd
CY2024Q2	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	2765000	usd
CY2024Q2	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	7324522000	usd
CY2024Q2	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	1073277000	usd
CY2024Q2	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	7982868000	usd
CY2024Q2	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	1076042000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	99075000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	1784000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	9494875000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	1218700000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	9593950000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	1220484000	usd
CY2024Q2	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	8000000000.0	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	9600000000	usd
CY2024Q2	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	1100000000	usd
	cbsh	Af Ssecuritiesinlosspositionatperiodendchangeinunrealizedloss AFSsecuritiesinlosspositionatperiodendchangeinunrealizedloss	-144400000	usd
CY2024Q2	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	9608044000	usd
CY2024Q2	cbsh	Available For Sale Securities Gross Unrealized Gain At Period End AvailableForSaleSecuritiesGrossUnrealizedGainAtPeriodEnd	2269000	usd
CY2024Q2	cbsh	Available For Sale Securities Gross Unrealized Lossat Period End AvailableForSaleSecuritiesGrossUnrealizedLossatPeriodEnd	1076042000	usd
CY2024Q2	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss DebtSecuritiesAvailableForSaleAllowanceForCreditLoss	0	usd
CY2024Q2	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	8534271000	usd
CY2023Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	10904765000	usd
CY2023Q4	cbsh	Available For Sale Securities Gross Unrealized Gain At Period End AvailableForSaleSecuritiesGrossUnrealizedGainAtPeriodEnd	479000	usd
CY2023Q4	cbsh	Available For Sale Securities Gross Unrealized Lossat Period End AvailableForSaleSecuritiesGrossUnrealizedLossatPeriodEnd	1220484000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss DebtSecuritiesAvailableForSaleAllowanceForCreditLoss	0	usd
CY2023Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	9684760000	usd
	cbsh	Proceeds From Sales Of Available For Sale Debt Securities Including Pending Trades ProceedsFromSalesOfAvailableForSaleDebtSecuritiesIncludingPendingTrades	1015845000	usd
	cbsh	Proceeds From Sales Of Available For Sale Debt Securities Including Pending Trades ProceedsFromSalesOfAvailableForSaleDebtSecuritiesIncludingPendingTrades	1101782000	usd
	us-gaap	Proceeds From Sale Of Equity Securities Fv Ni ProceedsFromSaleOfEquitySecuritiesFvNi	120012000	usd
	us-gaap	Proceeds From Sale Of Equity Securities Fv Ni ProceedsFromSaleOfEquitySecuritiesFvNi	0	usd
	cbsh	Proceeds From Sales Of Other Investments Including Pending Trades ProceedsFromSalesOfOtherInvestmentsIncludingPendingTrades	21319000	usd
	cbsh	Proceeds From Sales Of Other Investments Including Pending Trades ProceedsFromSalesOfOtherInvestmentsIncludingPendingTrades	28754000	usd
	cbsh	Total Proceeds From Sales Of Investments Including Pending Trades TotalProceedsFromSalesOfInvestmentsIncludingPendingTrades	1157176000	usd
	cbsh	Total Proceeds From Sales Of Investments Including Pending Trades TotalProceedsFromSalesOfInvestmentsIncludingPendingTrades	1130536000	usd
	us-gaap	Gain Loss On Investments GainLossOnInvestments	2974000	usd
	us-gaap	Gain Loss On Investments GainLossOnInvestments	3086000	usd
CY2024Q2	cbsh	Debt Securities Available For Sale Planned Sale Amortized Cost DebtSecuritiesAvailableForSalePlannedSaleAmortizedCost	1200000000	usd
CY2024Q2	cbsh	Debt Securities Available For Sale Planned Sale Yield DebtSecuritiesAvailableForSalePlannedSaleYield	0.021	rate
CY2024Q2	cbsh	Loss On Available For Sale Debt Securities Portfolio Repositioning LossOnAvailableForSaleDebtSecuritiesPortfolioRepositioning	179100000	usd
CY2024Q2	cbsh	Debt Securities Available For Sale Planned Sale Reinvestment DebtSecuritiesAvailableForSalePlannedSaleReinvestment	928800000	usd
CY2024Q2	cbsh	Debt Securities Available For Sale Planned Sale Yield Of Reinvestment DebtSecuritiesAvailableForSalePlannedSaleYieldOfReinvestment	0.046	rate
CY2024Q2	cbsh	Investment Securities Pledged At Fair Value InvestmentSecuritiesPledgedAtFairValue	6500000000	usd
CY2023Q4	cbsh	Investment Securities Pledged At Fair Value InvestmentSecuritiesPledgedAtFairValue	7500000000	usd
CY2024Q2	cbsh	Investments Exceeding Ten Percent Of Stockholders Equity InvestmentsExceedingTenPercentOfStockholdersEquity	0
CY2024Q2	cbsh	Percentage Of Stockholders Equity Of Which No Investment From Single Issuer Exceeds PercentageOfStockholdersEquityOfWhichNoInvestmentFromSingleIssuerExceeds	0.10
CY2024Q2	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	19109000	usd
CY2024Q2	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	8908000	usd
CY2024Q2	us-gaap	Valuation Allowances And Reserves Balance ValuationAllowancesAndReservesBalance	0	usd
CY2024Q2	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	10201000	usd
CY2023Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	19273000	usd
CY2023Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	8694000	usd
CY2023Q4	us-gaap	Valuation Allowances And Reserves Balance ValuationAllowancesAndReservesBalance	0	usd
CY2023Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	10579000	usd
CY2024Q2	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	320000	usd
CY2023Q2	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	353000	usd
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	651000	usd
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	709000	usd
CY2024Q2	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	1279000	usd
CY2024Q2	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	1175000	usd
CY2024Q2	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	1025000	usd
CY2024Q2	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	884000	usd
CY2024Q2	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	768000	usd
CY2024Q2	us-gaap	Goodwill Goodwill	146539000	usd
CY2023Q4	us-gaap	Goodwill Goodwill	146539000	usd
CY2024Q2	us-gaap	Sales Type And Direct Financing Leases Profit Loss SalesTypeAndDirectFinancingLeasesProfitLoss	9043000	usd
CY2023Q2	us-gaap	Sales Type And Direct Financing Leases Profit Loss SalesTypeAndDirectFinancingLeasesProfitLoss	7541000	usd
	us-gaap	Sales Type And Direct Financing Leases Profit Loss SalesTypeAndDirectFinancingLeasesProfitLoss	18055000	usd
	us-gaap	Sales Type And Direct Financing Leases Profit Loss SalesTypeAndDirectFinancingLeasesProfitLoss	14296000	usd
CY2024Q2	us-gaap	Operating Lease Lease Income OperatingLeaseLeaseIncome	4260000	usd
CY2023Q2	us-gaap	Operating Lease Lease Income OperatingLeaseLeaseIncome	3483000	usd
	us-gaap	Operating Lease Lease Income OperatingLeaseLeaseIncome	8392000	usd
	us-gaap	Operating Lease Lease Income OperatingLeaseLeaseIncome	5816000	usd
CY2024Q2	us-gaap	Lease Income LeaseIncome	13303000	usd
CY2023Q2	us-gaap	Lease Income LeaseIncome	11024000	usd
	us-gaap	Lease Income LeaseIncome	26447000	usd
	us-gaap	Lease Income LeaseIncome	20112000	usd
CY2024Q2	us-gaap	Defined Benefit Plan Service Cost DefinedBenefitPlanServiceCost	96000	usd
CY2023Q2	us-gaap	Defined Benefit Plan Service Cost DefinedBenefitPlanServiceCost	116000	usd
	us-gaap	Defined Benefit Plan Service Cost DefinedBenefitPlanServiceCost	193000	usd
	us-gaap	Defined Benefit Plan Service Cost DefinedBenefitPlanServiceCost	232000	usd
CY2024Q2	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	1113000	usd
CY2023Q2	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	1157000	usd
	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	2225000	usd
	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	2315000	usd
CY2024Q2	us-gaap	Defined Benefit Plan Expected Return On Plan Assets DefinedBenefitPlanExpectedReturnOnPlanAssets	1019000	usd
CY2023Q2	us-gaap	Defined Benefit Plan Expected Return On Plan Assets DefinedBenefitPlanExpectedReturnOnPlanAssets	1001000	usd
	us-gaap	Defined Benefit Plan Expected Return On Plan Assets DefinedBenefitPlanExpectedReturnOnPlanAssets	2038000	usd
	us-gaap	Defined Benefit Plan Expected Return On Plan Assets DefinedBenefitPlanExpectedReturnOnPlanAssets	2002000	usd
CY2024Q2	us-gaap	Defined Benefit Plan Amortization Of Prior Service Cost Credit DefinedBenefitPlanAmortizationOfPriorServiceCostCredit	-46000	usd
CY2023Q2	us-gaap	Defined Benefit Plan Amortization Of Prior Service Cost Credit DefinedBenefitPlanAmortizationOfPriorServiceCostCredit	-68000	usd
	us-gaap	Defined Benefit Plan Amortization Of Prior Service Cost Credit DefinedBenefitPlanAmortizationOfPriorServiceCostCredit	-91000	usd
	us-gaap	Defined Benefit Plan Amortization Of Prior Service Cost Credit DefinedBenefitPlanAmortizationOfPriorServiceCostCredit	-135000	usd
CY2024Q2	us-gaap	Defined Benefit Plan Amortization Of Gains Losses DefinedBenefitPlanAmortizationOfGainsLosses	-282000	usd
CY2023Q2	us-gaap	Defined Benefit Plan Amortization Of Gains Losses DefinedBenefitPlanAmortizationOfGainsLosses	-427000	usd
	us-gaap	Defined Benefit Plan Amortization Of Gains Losses DefinedBenefitPlanAmortizationOfGainsLosses	-562000	usd
	us-gaap	Defined Benefit Plan Amortization Of Gains Losses DefinedBenefitPlanAmortizationOfGainsLosses	-854000	usd
CY2024Q2	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	426000	usd
CY2023Q2	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	631000	usd
	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	851000	usd
	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	1264000	usd
	us-gaap	Defined Benefit Plan Contributions By Employer DefinedBenefitPlanContributionsByEmployer	0	usd
CY2024Q2	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	411000	shares
CY2023Q2	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	450000	shares
	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	382000	shares
	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	277000	shares
CY2023Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-891412000	usd
	us-gaap	Other Comprehensive Income Loss Before Reclassifications Before Tax OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax	-70677000	usd
	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Before Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax	-182137000	usd
	us-gaap	Other Comprehensive Income Loss Before Tax OtherComprehensiveIncomeLossBeforeTax	111460000	usd
	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	27865000	usd
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	83595000	usd
CY2024Q2	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-807817000	usd
CY2022Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-1086864000	usd
	us-gaap	Other Comprehensive Income Loss Before Reclassifications Before Tax OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax	66812000	usd
	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Before Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax	-614000	usd
	us-gaap	Other Comprehensive Income Loss Before Tax OtherComprehensiveIncomeLossBeforeTax	67426000	usd
	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	16857000	usd
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	50569000	usd
CY2023Q2	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-1036295000	usd
	us-gaap	Number Of Operating Segments NumberOfOperatingSegments	3	operating_segments
CY2024Q2	cbsh	Number Of Locations NumberOfLocations	140	locations
	us-gaap	Revenues Revenues	0	usd
CY2023Q2	us-gaap	Revenues Revenues	0	usd
CY2024Q2	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	262249000	usd
CY2024Q2	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	5468000	usd
CY2024Q2	us-gaap	Noninterest Income NoninterestIncome	152244000	usd
CY2024Q2	us-gaap	Gain Loss On Investments GainLossOnInvestments	3233000	usd
CY2024Q2	us-gaap	Noninterest Expense NoninterestExpense	232214000	usd
CY2024Q2	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	180044000	usd
	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	511248000	usd
	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	10255000	usd
	us-gaap	Noninterest Income NoninterestIncome	301092000	usd
	us-gaap	Gain Loss On Investments GainLossOnInvestments	2974000	usd
	us-gaap	Noninterest Expense NoninterestExpense	477911000	usd
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	327148000	usd
CY2023Q2	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	249538000	usd
CY2023Q2	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	6471000	usd
CY2023Q2	us-gaap	Noninterest Income NoninterestIncome	147605000	usd
CY2023Q2	us-gaap	Gain Loss On Investments GainLossOnInvestments	3392000	usd
CY2023Q2	us-gaap	Noninterest Expense NoninterestExpense	227611000	usd
CY2023Q2	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	166453000	usd
	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	501161000	usd
	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	17927000	usd
	us-gaap	Noninterest Income NoninterestIncome	285217000	usd
	us-gaap	Gain Loss On Investments GainLossOnInvestments	3086000	usd
	us-gaap	Noninterest Expense NoninterestExpense	451718000	usd
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	319819000	usd
CY2024Q2	us-gaap	Derivative Notional Amount DerivativeNotionalAmount	5292764000	usd
CY2023Q4	us-gaap	Derivative Notional Amount DerivativeNotionalAmount	5194716000	usd
CY2024Q2	us-gaap	Derivative Assets DerivativeAssets	86709000	usd
CY2023Q4	us-gaap	Derivative Assets DerivativeAssets	116876000	usd
CY2024Q2	us-gaap	Derivative Liabilities DerivativeLiabilities	36915000	usd
CY2023Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	37899000	usd
CY2024Q2	us-gaap	Gain Loss On Derivative Instruments Net Pretax GainLossOnDerivativeInstrumentsNetPretax	994000	usd
CY2023Q2	us-gaap	Gain Loss On Derivative Instruments Net Pretax GainLossOnDerivativeInstrumentsNetPretax	1898000	usd
	us-gaap	Gain Loss On Derivative Instruments Net Pretax GainLossOnDerivativeInstrumentsNetPretax	1197000	usd
	us-gaap	Gain Loss On Derivative Instruments Net Pretax GainLossOnDerivativeInstrumentsNetPretax	2559000	usd
CY2024Q2	us-gaap	Derivative Asset Fair Value Gross Asset Including Not Subject To Master Netting Arrangement DerivativeAssetFairValueGrossAssetIncludingNotSubjectToMasterNettingArrangement	86709000	usd
CY2024Q2	cbsh	Derivative Asset Amount Offset By Liabiilty DerivativeAssetAmountOffsetByLiabiilty	0	usd
CY2024Q2	us-gaap	Derivative Assets DerivativeAssets	86709000	usd
CY2024Q2	us-gaap	Derivative Liability Fair Value Gross Liability Including Not Subject To Master Netting Arrangement DerivativeLiabilityFairValueGrossLiabilityIncludingNotSubjectToMasterNettingArrangement	36915000	usd
CY2024Q2	cbsh	Derivative Liability Amount Offset By Asset DerivativeLiabilityAmountOffsetByAsset	0	usd
CY2024Q2	us-gaap	Derivative Liabilities DerivativeLiabilities	36915000	usd
CY2023Q4	us-gaap	Derivative Asset Fair Value Gross Asset Including Not Subject To Master Netting Arrangement DerivativeAssetFairValueGrossAssetIncludingNotSubjectToMasterNettingArrangement	116876000	usd
CY2023Q4	cbsh	Derivative Asset Amount Offset By Liabiilty DerivativeAssetAmountOffsetByLiabiilty	0	usd
CY2023Q4	us-gaap	Derivative Assets DerivativeAssets	116876000	usd
CY2023Q4	us-gaap	Derivative Liability Fair Value Gross Liability Including Not Subject To Master Netting Arrangement DerivativeLiabilityFairValueGrossLiabilityIncludingNotSubjectToMasterNettingArrangement	37899000	usd
CY2023Q4	cbsh	Derivative Liability Amount Offset By Asset DerivativeLiabilityAmountOffsetByAsset	0	usd
CY2023Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	37899000	usd
CY2024Q2	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	4200000	usd
CY2023Q2	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	3900000	usd
	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	8500000	usd
	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	8300000	usd
CY2023Q4	cbsh	Nonvested Share Awards Balances NonvestedShareAwardsBalances	1166335	shares
CY2023Q4	cbsh	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Nonvested Share Awards Weighted Average Grant Date Unit Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsNonvestedShareAwardsWeightedAverageGrantDateUnitFairValue	58.48
	cbsh	Nonvested Share Awards Granted In Period NonvestedShareAwardsGrantedInPeriod	322088	shares
	cbsh	Share Based Compensation Granted Nonvested Share Award Weighted Average Grant Date Fair Value ShareBasedCompensationGrantedNonvestedShareAwardWeightedAverageGrantDateFairValue	52.03
	cbsh	Nonvested Share Awards Vested In Period NonvestedShareAwardsVestedInPeriod	250127	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	52.21
	cbsh	Nonvested Share Awards Forfeited In Period NonvestedShareAwardsForfeitedInPeriod	27582	shares
	cbsh	Share Based Compensation Forfeited Nonvested Share Award Weighted Average Grant Date Fair Value ShareBasedCompensationForfeitedNonvestedShareAwardWeightedAverageGrantDateFairValue	59.87
CY2024Q2	cbsh	Nonvested Share Awards Balances NonvestedShareAwardsBalances	1210714	shares
CY2024Q2	cbsh	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Nonvested Share Awards Weighted Average Grant Date Unit Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsNonvestedShareAwardsWeightedAverageGrantDateUnitFairValue	58.03
	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	14.88
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate	0.021
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate	0.293
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate	0.042
	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Fair Value Assumptions Expected Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1	P6Y
CY2023Q4	cbsh	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Number ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNumber	1023321	shares
CY2023Q4	cbsh	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsWeightedAverageExercisePrice	47.10
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod	117974	shares
	cbsh	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageExercisePrice	52.00
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeited In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod	5012	shares
	cbsh	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeited In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriodWeightedAverageExercisePrice	59.54
	cbsh	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Expired In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpiredInPeriod	6756	shares
	cbsh	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Expired In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpiredInPeriodWeightedAverageExercisePrice	49.94
	cbsh	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Exercised In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisedInPeriod	67213	shares
	cbsh	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Exercised In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisedInPeriodWeightedAverageExercisePrice	31.76
CY2024Q2	cbsh	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Number ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNumber	1062314	shares
CY2024Q2	cbsh	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsWeightedAverageExercisePrice	48.54
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Outstanding Weighted Average Remaining Contractual Terms ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageRemainingContractualTerms	P5Y1M6D
CY2024Q2	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Equity Instruments Other Than Options Aggregate Intrinsic Value Outstanding SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueOutstanding	9679000	usd
	cbsh	Percentof Revenuenotinscopeof Asc606 PercentofRevenuenotinscopeofASC606	0.63
CY2024Q2	us-gaap	Noninterest Income NoninterestIncome	152244000	usd
CY2023Q2	us-gaap	Noninterest Income NoninterestIncome	147605000	usd
	us-gaap	Noninterest Income NoninterestIncome	301092000	usd
	us-gaap	Noninterest Income NoninterestIncome	285217000	usd
CY2024Q2	us-gaap	Mortgages Held For Sale Fair Value Disclosure MortgagesHeldForSaleFairValueDisclosure	2186000	usd
CY2024Q2	us-gaap	Financial Instruments Owned Us Government And Agency Obligations At Fair Value FinancialInstrumentsOwnedUSGovernmentAndAgencyObligationsAtFairValue	1637827000	usd
CY2024Q2	cbsh	Us Government Sponsored Enterprises Debt Securities USGovernmentSponsoredEnterprisesDebtSecurities	43139000	usd
CY2024Q2	us-gaap	Financial Instruments Owned State And Municipal Government Obligations At Fair Value FinancialInstrumentsOwnedStateAndMunicipalGovernmentObligationsAtFairValue	775983000	usd
CY2024Q2	cbsh	Financial Instruments Owned Agency Mortgage Backed Securities At Fair Value FinancialInstrumentsOwnedAgencyMortgageBackedSecuritiesAtFairValue	3630296000	usd
CY2024Q2	cbsh	Financial Instruments Owned Non Agency Mortgage Backed Securities At Fair Value FinancialInstrumentsOwnedNonAgencyMortgageBackedSecuritiesAtFairValue	646357000	usd
CY2024Q2	cbsh	Other Asset Backed Securities Disclosure OtherAssetBackedSecuritiesDisclosure	1583747000	usd
CY2024Q2	cbsh	Financial Instruments Owned Other Debt Securities At Fair Value FinancialInstrumentsOwnedOtherDebtSecuritiesAtFairValue	216922000	usd
CY2024Q2	us-gaap	Trading Securities TradingSecurities	45499000	usd
CY2024Q2	us-gaap	Equity Securities Fv Ni EquitySecuritiesFvNi	47804000	usd
CY2024Q2	us-gaap	Financial Instruments Owned Principal Investments At Fair Value FinancialInstrumentsOwnedPrincipalInvestmentsAtFairValue	178321000	usd
CY2024Q2	us-gaap	Derivative Assets DerivativeAssets	86709000	usd
CY2024Q2	us-gaap	Deferred Compensation Plan Assets DeferredCompensationPlanAssets	21550000	usd
CY2024Q2	us-gaap	Assets Fair Value Disclosure AssetsFairValueDisclosure	8916340000	usd
CY2024Q2	us-gaap	Derivative Liabilities DerivativeLiabilities	36915000	usd
CY2024Q2	us-gaap	Deferred Compensation Liability Current And Noncurrent DeferredCompensationLiabilityCurrentAndNoncurrent	21550000	usd
CY2024Q2	us-gaap	Liabilities Fair Value Disclosure LiabilitiesFairValueDisclosure	58465000	usd
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CY2023Q4	cbsh	Other Asset Backed Securities Disclosure OtherAssetBackedSecuritiesDisclosure	2107485000	usd
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CY2024Q2	cbsh	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Discount Accretion FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetDiscountAccretion	1000	usd
CY2024Q2	cbsh	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Purchase Of Private Equity Securities FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchaseOfPrivateEquitySecurities	1470000	usd
CY2024Q2	cbsh	Sales And Repayments Of Private Equity Securities SalesAndRepaymentsOfPrivateEquitySecurities	12564000	usd
CY2024Q2	cbsh	Capitalized Interest Or Dividends CapitalizedInterestOrDividends	32000	usd
CY2024Q2	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	179274000	usd
CY2024Q2	cbsh	Change In Unrealized Gains Or Losses Related To Assets Held Level3 Fair Value Measurements ChangeInUnrealizedGainsOrLossesRelatedToAssetsHeldLevel3FairValueMeasurements	5677000	usd
CY2024Q2	cbsh	Gains Losses Included In Oci Attributable To Change In Unrealized Gains Losses Relating To Assets Still Held Total GainsLossesIncludedInOCIAttributableToChangeInUnrealizedGainsLossesRelatingToAssetsStillHeldTotal	-4000	usd
CY2023Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	177614000	usd
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	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Other Comprehensive Income Loss FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss	5000	usd
	cbsh	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Discount Accretion FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetDiscountAccretion	1000	usd
	cbsh	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Purchase Of Private Equity Securities FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchaseOfPrivateEquitySecurities	10947000	usd
	cbsh	Sales And Repayments Of Private Equity Securities SalesAndRepaymentsOfPrivateEquitySecurities	21964000	usd
	cbsh	Capitalized Interest Or Dividends CapitalizedInterestOrDividends	-106000	usd
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	cbsh	Change In Unrealized Gains Or Losses Related To Assets Held Level3 Fair Value Measurements ChangeInUnrealizedGainsOrLossesRelatedToAssetsHeldLevel3FairValueMeasurements	11002000	usd
	cbsh	Gains Losses Included In Oci Attributable To Change In Unrealized Gains Losses Relating To Assets Still Held Total GainsLossesIncludedInOCIAttributableToChangeInUnrealizedGainsLossesRelatingToAssetsStillHeldTotal	5000	usd
CY2023Q1	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	164332000	usd
CY2023Q2	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Earnings1 FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1	-9090000	usd
CY2023Q2	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Other Comprehensive Income Loss FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss	5000	usd
CY2023Q2	cbsh	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Discount Accretion FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetDiscountAccretion	1000	usd
CY2023Q2	cbsh	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Purchase Of Private Equity Securities FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchaseOfPrivateEquitySecurities	224000	usd
CY2023Q2	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	173652000	usd
CY2023Q2	cbsh	Change In Unrealized Gains Or Losses Related To Assets Held Level3 Fair Value Measurements ChangeInUnrealizedGainsOrLossesRelatedToAssetsHeldLevel3FairValueMeasurements	9090000	usd
CY2023Q2	cbsh	Gains Losses Included In Oci Attributable To Change In Unrealized Gains Losses Relating To Assets Still Held Total GainsLossesIncludedInOCIAttributableToChangeInUnrealizedGainsLossesRelatingToAssetsStillHeldTotal	5000	usd
	cbsh	Investment Securities Called InvestmentSecuritiesCalled	1000000	usd
	cbsh	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Discount Accretion FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetDiscountAccretion	48000	usd
	cbsh	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Purchase Of Private Equity Securities FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchaseOfPrivateEquitySecurities	10756000	usd
	cbsh	Sales And Repayments Of Private Equity Securities SalesAndRepaymentsOfPrivateEquitySecurities	27492000	usd
CY2023Q2	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	173652000	usd
	cbsh	Change In Unrealized Gains Or Losses Related To Assets Held Level3 Fair Value Measurements ChangeInUnrealizedGainsOrLossesRelatedToAssetsHeldLevel3FairValueMeasurements	11341000	usd
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CY2024Q2	cbsh	Loans Nonrecurring Basis LoansNonrecurringBasis	15081000	usd
	cbsh	Loans Nonrecurring Basis Gains Losses LoansNonrecurringBasisGainsLosses	-2850000	usd
CY2024Q2	cbsh	Equity Securities Nonrecurring Basis EquitySecuritiesNonrecurringBasis	58376000	usd
	cbsh	Equity Securities Nonrecurring Basis Gains Losses EquitySecuritiesNonrecurringBasisGainsLosses	58241000	usd
CY2023Q2	cbsh	Loans Nonrecurring Basis LoansNonrecurringBasis	1647000	usd
	cbsh	Loans Nonrecurring Basis Gains Losses LoansNonrecurringBasisGainsLosses	588000	usd
CY2024Q2	ecd	Non Rule10b51 Arr Adopted Flag NonRule10b51ArrAdoptedFlag	false
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CY2024Q2	ecd	Rule10b51 Arr Trmntd Flag Rule10b51ArrTrmntdFlag	false

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$CBSH
COMMERCE BANCSHARES INC /MO/ Stock $cbsh

2024 Q3 Form 10-Q Financial Statement

#000002235624000047 Filed on August 06, 2024

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$CBSH COMMERCE BANCSHARES INC /MO/ Stock $cbsh

2024 Q3 Form 10-Q Financial Statement

#000002235624000047 Filed on August 06, 2024

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$CBSH
COMMERCE BANCSHARES INC /MO/ Stock $cbsh