$CBSH
COMMERCE BANCSHARES INC /MO/ Stock $cbsh

$cbsh Overview Financials Valuation SEC Filings Company Website

2019 Q3 Form 10-Q Financial Statement

#000002235619000034 Filed on August 05, 2019

Income Statement

Concept	2019 Q3	2019 Q2	2018 Q2
Revenue	$0.00	$0.00	$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	$10.40M	$10.30M	$9.600M
YoY Change	8.33%	7.29%	-3.03%
% of Gross Profit
Operating Expenses
YoY Change
Operating Profit
YoY Change
Interest Expense	$28.23M	$26.78M	$14.66M
YoY Change	66.09%	82.61%	35.94%
% of Operating Profit
Other Income/Expense, Net
YoY Change
Pretax Income	$139.2M	$137.2M	$140.8M
YoY Change	-1.09%	-2.58%	25.53%
Income Tax	$29.10M	$28.90M	$29.51M
% Of Pretax Income	20.91%	21.06%	20.95%
Net Earnings	$109.2M	$108.0M	$110.3M
YoY Change	-2.96%	-2.14%	39.73%
Net Earnings / Revenue
Basic Earnings Per Share	$0.93	$0.91	$0.96
Diluted Earnings Per Share	$0.93	$0.91	$0.96
COMMON SHARES
Basic Shares Outstanding	109.7M shares	110.5M shares	106.6M shares
Diluted Shares Outstanding

Balance Sheet

Concept	2019 Q3	2019 Q2	2018 Q2
SHORT-TERM ASSETS
Cash & Short-Term Investments
YoY Change
Cash & Equivalents	$884.4M	$961.5M	$547.6M
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	$365.9M	$363.6M	$331.8M
YoY Change	10.27%	9.58%	-0.84%
Goodwill	$138.9M	$138.9M	$138.9M
YoY Change	0.0%	0.0%	0.0%
Intangibles	$9.139M	$8.763M	$8.083M
YoY Change	7.9%	8.41%	15.44%
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	$25.88B	$25.77B	$24.52B
YoY Change	3.25%	5.09%	-2.21%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable
YoY Change
Accrued Expenses	$27.00M	$28.00M
YoY Change
Deferred Revenue
YoY Change
Short-Term Debt	$1.641B	$2.394B	$1.167B
YoY Change	-11.87%	105.14%	-7.09%
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$27.00M	$28.00M	$1.167B
YoY Change	-98.55%	-97.6%	-7.09%
LONG-TERM LIABILITIES
Long-Term Debt	$257.0M	$5.000M	$9.000M
YoY Change	12750.0%	-44.44%	-91.18%
Other Long-Term Liabilities	$535.0M	$345.0M	$256.0M
YoY Change	108.17%	34.77%	-4.12%
Total Long-Term Liabilities	$792.0M	$350.0M	$265.0M
YoY Change	205.79%	32.08%	-28.18%
TOTAL LIABILITIES
Total Short-Term Liabilities	$27.00M	$28.00M	$1.167B
Total Long-Term Liabilities	$792.0M	$350.0M	$265.0M
Total Liabilities	$22.77B	$22.60B	$21.75B
YoY Change	2.32%	3.9%	-3.11%
SHAREHOLDERS EQUITY
Retained Earnings	$463.2M	$384.2M	$408.4M
YoY Change	-6.16%	-5.91%	4.48%
Common Stock	$559.4M	$559.4M	$535.4M
YoY Change	4.49%	4.49%	4.98%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$251.7M	$106.1M	$15.85M
YoY Change	658.62%	569.27%	52.84%
Treasury Stock Shares	4.315M shares	1.753M shares	275.6K shares
Shareholders Equity	$3.103B	$3.169B	$2.768B
YoY Change
Total Liabilities & Shareholders Equity	$25.88B	$25.77B	$24.52B
YoY Change	3.25%	5.09%	-2.21%

Cashflow Statement

Concept	2019 Q3	2019 Q2	2018 Q2
OPERATING ACTIVITIES
Net Income	$109.2M	$108.0M	$110.3M
YoY Change	-2.96%	-2.14%	39.73%
Depreciation, Depletion And Amortization	$10.40M	$10.30M	$9.600M
YoY Change	8.33%	7.29%	-3.03%
Cash From Operating Activities	$125.6M	$109.5M	$144.1M
YoY Change	-20.81%	-24.01%	109.45%
INVESTING ACTIVITIES
Capital Expenditures	-$9.100M	-$9.000M	-$8.500M
YoY Change	15.19%	5.88%	-1.16%
Acquisitions
YoY Change
Other Investing Activities	-$297.1M	-$107.7M	-$21.90M
YoY Change	-20.09%	391.78%	-106.7%
Cash From Investing Activities	-$306.3M	-$116.7M	-$30.50M
YoY Change	-19.33%	282.62%	-109.58%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	103.6M	362.2M	-150.9M
YoY Change	-78.35%	-340.03%	-61.95%
NET CHANGE
Cash From Operating Activities	125.6M	109.5M	144.1M
Cash From Investing Activities	-306.3M	-116.7M	-30.50M
Cash From Financing Activities	103.6M	362.2M	-150.9M
Net Change In Cash	-77.10M	355.0M	-37.30M
YoY Change	-129.94%	-1051.74%	296.81%
FREE CASH FLOW
Cash From Operating Activities	$125.6M	$109.5M	$144.1M
Capital Expenditures	-$9.100M	-$9.000M	-$8.500M
Free Cash Flow	$134.7M	$118.5M	$152.6M
YoY Change	-19.1%	-22.35%	97.16%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
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CY2018Q2	cbsh	Investment Securities Called InvestmentSecuritiesCalled	0	USD
	cbsh	Investment Securities Called InvestmentSecuritiesCalled	0	USD
CY2019Q2	cbsh	Investment Securities Sold InvestmentSecuritiesSold	0	USD
	cbsh	Investment Securities Sold InvestmentSecuritiesSold	0	USD
CY2019Q2	cbsh	Loans Held For Sale90 Days Past Dueand Still Accruing LoansHeldForSale90DaysPastDueandStillAccruing	0	USD
CY2018Q2	cbsh	Purchase Of Risk Participation Agreement PurchaseOfRiskParticipationAgreement	0	USD
CY2018Q4	cbsh	Available For Sale Securities Pledged To Secure Structured Repurchase Agreements AvailableForSaleSecuritiesPledgedToSecureStructuredRepurchaseAgreements	463325000	USD
CY2019Q2	cbsh	Available For Sale Securities Pledged To Secure Structured Repurchase Agreements AvailableForSaleSecuritiesPledgedToSecureStructuredRepurchaseAgreements	205266000	USD
CY2018Q2	cbsh	Capitalized Interest Or Dividends CapitalizedInterestOrDividends	0	USD
CY2019Q2	cbsh	Foreclosed Assets Nonrecurring Basis ForeclosedAssetsNonrecurringBasis	0	USD
	cbsh	Foreclosed Assets Nonrecurring Basis Gains Losses ForeclosedAssetsNonrecurringBasisGainsLosses	0	USD
	cbsh	Purchase Of Risk Participation Agreement PurchaseOfRiskParticipationAgreement	0	USD
CY2018Q2	cbsh	Sale Of Risk Participation Agreement SaleOfRiskParticipationAgreement	0	USD
	dei	Amendment Flag AmendmentFlag	false
	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	Q2
	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2019
	dei	Entity Central Index Key EntityCentralIndexKey	0000022356
CY2018Q2	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.224
	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.448
CY2019Q2	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.260
	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.520
CY2018Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	5.00
CY2019Q2	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	5.00
CY2018Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	120000000	shares
CY2018Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	111886450	shares
CY2019Q2	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	111886450	shares
	us-gaap	Defined Benefit Plan Contributions By Employer DefinedBenefitPlanContributionsByEmployer	0	USD
CY2018Q4	us-gaap	Mortgages Held For Sale Fair Value Disclosure MortgagesHeldForSaleFairValueDisclosure	13529000	USD
CY2019Q2	us-gaap	Mortgages Held For Sale Fair Value Disclosure MortgagesHeldForSaleFairValueDisclosure	9285000	USD
CY2018Q4	us-gaap	Other Foreclosed Assets OtherForeclosedAssets	2000000	USD
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	us-gaap	Preferred Stock Dividends Per Share Cash Paid PreferredStockDividendsPerShareCashPaid	0.750
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CY2018Q2	us-gaap	Revenues Revenues	0	USD
	us-gaap	Revenues Revenues	0	USD
CY2019Q2	us-gaap	Revenues Revenues	0	USD
CY2018Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	555100	shares
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	dei	Document Type DocumentType	10-Q
	dei	Document Quarterly Report DocumentQuarterlyReport	true
	dei	Document Period End Date DocumentPeriodEndDate	2019-06-30
	dei	Document Transition Report DocumentTransitionReport	false
	dei	Entity File Number EntityFileNumber	0-2989
	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	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
CY2019Q3	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	109747277	shares
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	us-gaap	Interest Expense Time Deposits100000 Or More InterestExpenseTimeDeposits100000OrMore	12933000	USD
	us-gaap	Interest Expense Time Deposits100000 Or More InterestExpenseTimeDeposits100000OrMore	6322000	USD
CY2019Q2	us-gaap	Interest Expense Federal Funds Purchased And Securities Sold Under Agreements To Repurchase InterestExpenseFederalFundsPurchasedAndSecuritiesSoldUnderAgreementsToRepurchase	8057000	USD
CY2018Q2	us-gaap	Interest Expense Federal Funds Purchased And Securities Sold Under Agreements To Repurchase InterestExpenseFederalFundsPurchasedAndSecuritiesSoldUnderAgreementsToRepurchase	3956000	USD
	us-gaap	Interest Expense Federal Funds Purchased And Securities Sold Under Agreements To Repurchase InterestExpenseFederalFundsPurchasedAndSecuritiesSoldUnderAgreementsToRepurchase	15566000	USD
	us-gaap	Interest Expense Federal Funds Purchased And Securities Sold Under Agreements To Repurchase InterestExpenseFederalFundsPurchasedAndSecuritiesSoldUnderAgreementsToRepurchase	7957000	USD
CY2019Q2	cbsh	Interest On Other Borrowings InterestOnOtherBorrowings	5000	USD
CY2018Q2	cbsh	Interest On Other Borrowings InterestOnOtherBorrowings	12000	USD
	cbsh	Interest On Other Borrowings InterestOnOtherBorrowings	10000	USD
	cbsh	Interest On Other Borrowings InterestOnOtherBorrowings	24000	USD
CY2019Q2	us-gaap	Interest Expense InterestExpense	26778000	USD
CY2018Q2	us-gaap	Interest Expense InterestExpense	14664000	USD
	us-gaap	Interest Expense InterestExpense	51155000	USD
	us-gaap	Interest Expense InterestExpense	27767000	USD
CY2019Q2	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	211634000	USD
CY2018Q2	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	210959000	USD
	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	415122000	USD
	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	403851000	USD
CY2019Q2	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	11806000	USD
CY2018Q2	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	10043000	USD
	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	24269000	USD
	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	20439000	USD
CY2019Q2	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	199828000	USD
CY2018Q2	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	200916000	USD
	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	390853000	USD
	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	383412000	USD
CY2019Q2	cbsh	Bank Card Transaction Fees BankCardTransactionFees	42646000	USD
CY2018Q2	cbsh	Bank Card Transaction Fees BankCardTransactionFees	43215000	USD
	cbsh	Bank Card Transaction Fees BankCardTransactionFees	82290000	USD
	cbsh	Bank Card Transaction Fees BankCardTransactionFees	84668000	USD
CY2019Q2	cbsh	Trustfeerevenue Trustfeerevenue	38375000	USD
CY2018Q2	cbsh	Trustfeerevenue Trustfeerevenue	37036000	USD
	cbsh	Trustfeerevenue Trustfeerevenue	75631000	USD
	cbsh	Trustfeerevenue Trustfeerevenue	73098000	USD
CY2019Q2	cbsh	Depositfeerevenue Depositfeerevenue	23959000	USD
CY2018Q2	cbsh	Depositfeerevenue Depositfeerevenue	23893000	USD
	cbsh	Depositfeerevenue Depositfeerevenue	46977000	USD
	cbsh	Depositfeerevenue Depositfeerevenue	46875000	USD
CY2019Q2	us-gaap	Noninterest Income Other NoninterestIncomeOther	1944000	USD
CY2018Q2	us-gaap	Noninterest Income Other NoninterestIncomeOther	1992000	USD
	us-gaap	Noninterest Income Other NoninterestIncomeOther	3823000	USD
	us-gaap	Noninterest Income Other NoninterestIncomeOther	4283000	USD
CY2019Q2	us-gaap	Brokerage Commissions Revenue BrokerageCommissionsRevenue	3888000	USD
CY2018Q2	us-gaap	Brokerage Commissions Revenue BrokerageCommissionsRevenue	3971000	USD
	us-gaap	Brokerage Commissions Revenue BrokerageCommissionsRevenue	7635000	USD
	us-gaap	Brokerage Commissions Revenue BrokerageCommissionsRevenue	7739000	USD
CY2019Q2	cbsh	Loan Fees And Sales LoanFeesAndSales	4238000	USD
CY2018Q2	cbsh	Loan Fees And Sales LoanFeesAndSales	3229000	USD
	cbsh	Loan Fees And Sales LoanFeesAndSales	7547000	USD
	cbsh	Loan Fees And Sales LoanFeesAndSales	6091000	USD
CY2019Q2	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	12209000	USD
CY2018Q2	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	11514000	USD
	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	24596000	USD
	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	21786000	USD
CY2019Q2	us-gaap	Noninterest Income NoninterestIncome	127259000	USD
CY2018Q2	us-gaap	Noninterest Income NoninterestIncome	124850000	USD
	us-gaap	Noninterest Income NoninterestIncome	248499000	USD
	us-gaap	Noninterest Income NoninterestIncome	244540000	USD
CY2019Q2	us-gaap	Gain Loss On Investments GainLossOnInvestments	-110000	USD
CY2018Q2	us-gaap	Gain Loss On Investments GainLossOnInvestments	-3075000	USD
	us-gaap	Gain Loss On Investments GainLossOnInvestments	-1035000	USD
	us-gaap	Gain Loss On Investments GainLossOnInvestments	2335000	USD
CY2019Q2	us-gaap	Labor And Related Expense LaborAndRelatedExpense	120062000	USD
CY2018Q2	us-gaap	Labor And Related Expense LaborAndRelatedExpense	115589000	USD
	us-gaap	Labor And Related Expense LaborAndRelatedExpense	242190000	USD
	us-gaap	Labor And Related Expense LaborAndRelatedExpense	231483000	USD
CY2019Q2	us-gaap	Occupancy Net OccupancyNet	11145000	USD
CY2018Q2	us-gaap	Occupancy Net OccupancyNet	11118000	USD
	us-gaap	Occupancy Net OccupancyNet	22646000	USD
	us-gaap	Occupancy Net OccupancyNet	22702000	USD
CY2019Q2	us-gaap	Equipment Expense EquipmentExpense	4790000	USD
CY2018Q2	us-gaap	Equipment Expense EquipmentExpense	4594000	USD
	us-gaap	Equipment Expense EquipmentExpense	9261000	USD
	us-gaap	Equipment Expense EquipmentExpense	9025000	USD
CY2019Q2	cbsh	Supplies Postage And Communication SuppliesPostageAndCommunication	5275000	USD
CY2018Q2	cbsh	Supplies Postage And Communication SuppliesPostageAndCommunication	5126000	USD
	cbsh	Supplies Postage And Communication SuppliesPostageAndCommunication	10437000	USD
	cbsh	Supplies Postage And Communication SuppliesPostageAndCommunication	10439000	USD
CY2019Q2	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	23248000	USD
CY2018Q2	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	21016000	USD
	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	45508000	USD
	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	41706000	USD
CY2019Q2	us-gaap	Marketing Expense MarketingExpense	6015000	USD
CY2018Q2	us-gaap	Marketing Expense MarketingExpense	5142000	USD
	us-gaap	Marketing Expense MarketingExpense	11915000	USD
	us-gaap	Marketing Expense MarketingExpense	9947000	USD
CY2019Q2	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	1693000	USD
CY2018Q2	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	3126000	USD
	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	3403000	USD
	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	6583000	USD
CY2019Q2	cbsh	Community Service CommunityService	641000	USD
CY2018Q2	cbsh	Community Service CommunityService	656000	USD
	cbsh	Community Service CommunityService	1444000	USD
	cbsh	Community Service CommunityService	1385000	USD
CY2019Q2	us-gaap	Other Noninterest Expense OtherNoninterestExpense	16910000	USD
CY2018Q2	us-gaap	Other Noninterest Expense OtherNoninterestExpense	15493000	USD
	us-gaap	Other Noninterest Expense OtherNoninterestExpense	34400000	USD
	us-gaap	Other Noninterest Expense OtherNoninterestExpense	30867000	USD
CY2019Q2	us-gaap	Noninterest Expense NoninterestExpense	189779000	USD
CY2018Q2	us-gaap	Noninterest Expense NoninterestExpense	181860000	USD
	us-gaap	Noninterest Expense NoninterestExpense	381204000	USD
	us-gaap	Noninterest Expense NoninterestExpense	364137000	USD
CY2019Q2	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	137198000	USD
CY2018Q2	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	140831000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	257113000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	266150000	USD
CY2019Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	28899000	USD
CY2018Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	29507000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	51759000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	52765000	USD
CY2019Q2	us-gaap	Profit Loss ProfitLoss	108299000	USD
CY2018Q2	us-gaap	Profit Loss ProfitLoss	111324000	USD
	us-gaap	Profit Loss ProfitLoss	205354000	USD
	us-gaap	Profit Loss ProfitLoss	213385000	USD
CY2019Q2	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	328000	USD
CY2018Q2	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	994000	USD
	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	245000	USD
	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	2071000	USD
CY2019Q2	us-gaap	Net Income Loss NetIncomeLoss	107971000	USD
CY2018Q2	us-gaap	Net Income Loss NetIncomeLoss	110330000	USD
	us-gaap	Net Income Loss NetIncomeLoss	205109000	USD
	us-gaap	Net Income Loss NetIncomeLoss	211314000	USD
CY2019Q2	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	2250000	USD
CY2018Q2	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	2250000	USD
	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	4500000	USD
	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	4500000	USD
CY2019Q2	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	105721000	USD
CY2018Q2	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	108080000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	200609000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	206814000	USD
CY2019Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.96
CY2018Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.96
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.81
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.84
CY2019Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.96
CY2018Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.96
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.81
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.84
CY2019Q2	us-gaap	Profit Loss ProfitLoss	108299000	USD
CY2018Q2	us-gaap	Profit Loss ProfitLoss	111324000	USD
	us-gaap	Profit Loss ProfitLoss	205354000	USD
	us-gaap	Profit Loss ProfitLoss	213385000	USD
CY2019Q2	cbsh	Net Unrealizedgainslossesonsecuritiesforwhichaportionofanotherthantemporaryimpairmenthasbeenrecordedinearnings NetUnrealizedgainslossesonsecuritiesforwhichaportionofanotherthantemporaryimpairmenthasbeenrecordedinearnings	-228000	USD
CY2018Q2	cbsh	Net Unrealizedgainslossesonsecuritiesforwhichaportionofanotherthantemporaryimpairmenthasbeenrecordedinearnings NetUnrealizedgainslossesonsecuritiesforwhichaportionofanotherthantemporaryimpairmenthasbeenrecordedinearnings	-123000	USD
	cbsh	Net Unrealizedgainslossesonsecuritiesforwhichaportionofanotherthantemporaryimpairmenthasbeenrecordedinearnings NetUnrealizedgainslossesonsecuritiesforwhichaportionofanotherthantemporaryimpairmenthasbeenrecordedinearnings	-187000	USD
	cbsh	Net Unrealizedgainslossesonsecuritiesforwhichaportionofanotherthantemporaryimpairmenthasbeenrecordedinearnings NetUnrealizedgainslossesonsecuritiesforwhichaportionofanotherthantemporaryimpairmenthasbeenrecordedinearnings	-78000	USD
CY2019Q2	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	76950000	USD
CY2018Q2	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-19489000	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	150391000	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-93210000	USD
CY2019Q2	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-388000	USD
CY2018Q2	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-394000	USD
	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-777000	USD
	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-787000	USD
CY2019Q2	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	19807000	USD
CY2018Q2	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	0	USD
	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	22586000	USD
	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	0	USD
CY2019Q2	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	96917000	USD
CY2018Q2	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-19218000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	173567000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-92501000	USD
CY2019Q2	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	205216000	USD
CY2018Q2	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	92106000	USD
	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	378921000	USD
	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	120884000	USD
CY2019Q2	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	328000	USD
CY2018Q2	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	994000	USD
	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	245000	USD
	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	2071000	USD
CY2019Q2	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	204888000	USD
CY2018Q2	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	91112000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	378676000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	118813000	USD
CY2019Q1	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	3043213000	USD
CY2019Q2	us-gaap	Profit Loss ProfitLoss	108299000	USD
CY2019Q2	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	96917000	USD
CY2019Q2	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	3154000	USD
CY2019Q2	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	46380000	USD
CY2019Q2	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	1000	USD
CY2019Q2	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	3399000	USD
CY2019Q2	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	28682000	USD
CY2019Q2	us-gaap	Dividends Preferred Stock Cash DividendsPreferredStockCash	2250000	USD
CY2019Q2	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	3171363000	USD
CY2018Q1	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	2705728000	USD
CY2018Q2	us-gaap	Profit Loss ProfitLoss	111324000	USD
CY2018Q2	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-19218000	USD
CY2018Q2	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	204000	USD
CY2018Q2	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	2002000	USD
CY2018Q2	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	-3000	USD
CY2018Q2	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	3104000	USD
CY2018Q2	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	25096000	USD
CY2018Q2	us-gaap	Dividends Preferred Stock Cash DividendsPreferredStockCash	2250000	USD
CY2018Q2	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	2771383000	USD
CY2018Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	2937149000	USD
	us-gaap	Profit Loss ProfitLoss	205354000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	173567000	USD
	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	3464000	USD
	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	86079000	USD
	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	-3000	USD
	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	6879000	USD
	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	57540000	USD
	us-gaap	Dividends Preferred Stock Cash DividendsPreferredStockCash	4500000	USD
CY2019Q2	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	3171363000	USD
CY2017Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	2718184000	USD
	us-gaap	Profit Loss ProfitLoss	213385000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-92501000	USD
	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	299000	USD
	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	19069000	USD
	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	-9000	USD
	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	6394000	USD
	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	50202000	USD
	us-gaap	Dividends Preferred Stock Cash DividendsPreferredStockCash	4500000	USD
CY2018Q2	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	2771383000	USD
	us-gaap	Profit Loss ProfitLoss	205354000	USD
	us-gaap	Profit Loss ProfitLoss	213385000	USD
	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	24269000	USD
	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	20439000	USD
	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	20297000	USD
	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	19180000	USD
	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	-12825000	USD
	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	-11679000	USD
	us-gaap	Gain Loss On Investments GainLossOnInvestments	-1035000	USD
	us-gaap	Gain Loss On Investments GainLossOnInvestments	2335000	USD
	us-gaap	Gain Loss On Sale Of Loans And Leases GainLossOnSaleOfLoansAndLeases	4584000	USD
	us-gaap	Gain Loss On Sale Of Loans And Leases GainLossOnSaleOfLoansAndLeases	2671000	USD
	cbsh	Origination Of Loans Held For Sale OriginationOfLoansHeldForSale	108306000	USD
	cbsh	Origination Of Loans Held For Sale OriginationOfLoansHeldForSale	89183000	USD
	us-gaap	Proceeds From Sale Of Loans Held For Sale ProceedsFromSaleOfLoansHeldForSale	112390000	USD
	us-gaap	Proceeds From Sale Of Loans Held For Sale ProceedsFromSaleOfLoansHeldForSale	91671000	USD
	us-gaap	Increase Decrease In Trading Securities IncreaseDecreaseInTradingSecurities	-3587000	USD
	us-gaap	Increase Decrease In Trading Securities IncreaseDecreaseInTradingSecurities	23843000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	6879000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	6394000	USD
	us-gaap	Increase Decrease In Interest And Dividends Receivable IncreaseDecreaseInInterestAndDividendsReceivable	-876000	USD
	us-gaap	Increase Decrease In Interest And Dividends Receivable IncreaseDecreaseInInterestAndDividendsReceivable	1717000	USD
	us-gaap	Increase Decrease In Interest Payable Net IncreaseDecreaseInInterestPayableNet	4421000	USD
	us-gaap	Increase Decrease In Interest Payable Net IncreaseDecreaseInInterestPayableNet	-601000	USD
	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	23590000	USD
	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	25721000	USD
	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	50899000	USD
	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	-19958000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	251734000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	288077000	USD
	cbsh	Proceedsfromsalesandmaturitiesofavailableforsaledebtequityandothersecurities Proceedsfromsalesandmaturitiesofavailableforsaledebtequityandothersecurities	375462000	USD
	cbsh	Proceedsfromsalesandmaturitiesofavailableforsaledebtequityandothersecurities Proceedsfromsalesandmaturitiesofavailableforsaledebtequityandothersecurities	192522000	USD
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	611223000	USD
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	812970000	USD
	us-gaap	Payments To Acquire Investments PaymentsToAcquireInvestments	972274000	USD
	us-gaap	Payments To Acquire Investments PaymentsToAcquireInvestments	748707000	USD
	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	143629000	USD
	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	-7978000	USD
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	20289000	USD
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	13525000	USD
	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	1477000	USD
	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	1667000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-148030000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	252905000	USD
	cbsh	Net Increase Decrease Non Interest Bearing Savings Interest Checking And Money Market Deposits NetIncreaseDecreaseNonInterestBearingSavingsInterestCheckingAndMoneyMarketDeposits	-1080769000	USD
	cbsh	Net Increase Decrease Non Interest Bearing Savings Interest Checking And Money Market Deposits NetIncreaseDecreaseNonInterestBearingSavingsInterestCheckingAndMoneyMarketDeposits	-27222000	USD
	us-gaap	Increase Decrease In Time Deposits IncreaseDecreaseInTimeDeposits	443799000	USD
	us-gaap	Increase Decrease In Time Deposits IncreaseDecreaseInTimeDeposits	-83895000	USD
	us-gaap	Increase Decrease In Federal Funds Purchased And Securities Sold Under Agreements To Repurchase Net IncreaseDecreaseInFederalFundsPurchasedAndSecuritiesSoldUnderAgreementsToRepurchaseNet	437905000	USD
	us-gaap	Increase Decrease In Federal Funds Purchased And Securities Sold Under Agreements To Repurchase Net IncreaseDecreaseInFederalFundsPurchasedAndSecuritiesSoldUnderAgreementsToRepurchaseNet	-340379000	USD
	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	108000	USD
	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	149000	USD
	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-4194000	USD
	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	7682000	USD
	cbsh	Paymentsforstockvalueissuedundersharebasedcompensationplans Paymentsforstockvalueissuedundersharebasedcompensationplans	9000	USD
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	86079000	USD
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	19069000	USD
	cbsh	Paymentsforstockvalueissuedundersharebasedcompensationplans Paymentsforstockvalueissuedundersharebasedcompensationplans	3000	USD
	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	57540000	USD
	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	50202000	USD
	us-gaap	Payments Of Dividends Preferred Stock And Preference Stock PaymentsOfDividendsPreferredStockAndPreferenceStock	4500000	USD
	us-gaap	Payments Of Dividends Preferred Stock And Preference Stock PaymentsOfDividendsPreferredStockAndPreferenceStock	4500000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-351489000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-517743000	USD
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	-247785000	USD
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	23239000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	1209240000	USD
CY2017Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	524352000	USD
CY2019Q2	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	961455000	USD
CY2018Q2	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	547591000	USD
	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	26042000	USD
	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	24969000	USD
	us-gaap	Interest Paid Net InterestPaidNet	46734000	USD
	us-gaap	Interest Paid Net InterestPaidNet	28368000	USD
	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	558000	USD
	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	1044000	USD
CY2019Q2	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	12900000	USD
CY2018Q2	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	14800000	USD
CY2019Q2	us-gaap	Loans And Leases Receivable Gross Carrying Amount LoansAndLeasesReceivableGrossCarryingAmount	14260248000	USD
CY2018Q4	us-gaap	Loans And Leases Receivable Gross Carrying Amount LoansAndLeasesReceivableGrossCarryingAmount	14140298000	USD
CY2019Q2	us-gaap	Pledged Financial Instruments Not Separately Reported Loans Receivable Pledged For Federal Home Loan Bank Debt PledgedFinancialInstrumentsNotSeparatelyReportedLoansReceivablePledgedForFederalHomeLoanBankDebt	3900000000	USD
CY2019Q2	cbsh	Pledged Financial Instruments Not Separately Reported Loans Pledged For Federal Reserve Bank Debt PledgedFinancialInstrumentsNotSeparatelyReportedLoansPledgedForFederalReserveBankDebt	1600000000	USD
CY2019Q1	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	160682000	USD
CY2018Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	159932000	USD
CY2019Q2	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	11806000	USD
	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	24269000	USD
CY2019Q2	us-gaap	Allowance For Loan And Lease Losses Write Offs AllowanceForLoanAndLeaseLossesWriteOffs	14458000	USD
	us-gaap	Allowance For Loan And Lease Losses Write Offs AllowanceForLoanAndLeaseLossesWriteOffs	29189000	USD
CY2019Q2	us-gaap	Allowance For Loan And Lease Loss Recovery Of Bad Debts AllowanceForLoanAndLeaseLossRecoveryOfBadDebts	3152000	USD
	us-gaap	Allowance For Loan And Lease Loss Recovery Of Bad Debts AllowanceForLoanAndLeaseLossRecoveryOfBadDebts	6170000	USD
CY2019Q2	us-gaap	Allowance For Loan And Lease Losses Writeoffs Net AllowanceForLoanAndLeaseLossesWriteoffsNet	11306000	USD
	us-gaap	Allowance For Loan And Lease Losses Writeoffs Net AllowanceForLoanAndLeaseLossesWriteoffsNet	23019000	USD
CY2019Q2	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	161182000	USD
CY2019Q2	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	161182000	USD
CY2018Q1	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	159532000	USD
CY2017Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	159532000	USD
CY2018Q2	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	10043000	USD
	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	20439000	USD
CY2018Q2	us-gaap	Allowance For Loan And Lease Losses Write Offs AllowanceForLoanAndLeaseLossesWriteOffs	13685000	USD
	us-gaap	Allowance For Loan And Lease Losses Write Offs AllowanceForLoanAndLeaseLossesWriteOffs	27416000	USD
CY2018Q2	us-gaap	Allowance For Loan And Lease Loss Recovery Of Bad Debts AllowanceForLoanAndLeaseLossRecoveryOfBadDebts	3642000	USD
	us-gaap	Allowance For Loan And Lease Loss Recovery Of Bad Debts AllowanceForLoanAndLeaseLossRecoveryOfBadDebts	6977000	USD
CY2018Q2	us-gaap	Allowance For Loan And Lease Losses Writeoffs Net AllowanceForLoanAndLeaseLossesWriteoffsNet	10043000	USD
	us-gaap	Allowance For Loan And Lease Losses Writeoffs Net AllowanceForLoanAndLeaseLossesWriteoffsNet	20439000	USD
CY2018Q2	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	159532000	USD
CY2018Q2	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	159532000	USD
CY2019Q2	us-gaap	Impaired Financing Receivable Related Allowance ImpairedFinancingReceivableRelatedAllowance	1903000	USD
CY2019Q2	us-gaap	Impaired Financing Receivable Recorded Investment ImpairedFinancingReceivableRecordedInvestment	56510000	USD
CY2019Q2	cbsh	Loans And Leases Receivable Allowance Excluding Impaired Financing Receivable Related Allowance LoansAndLeasesReceivableAllowanceExcludingImpairedFinancingReceivableRelatedAllowance	159279000	USD
CY2019Q2	cbsh	Loans And Leases Receivable Excluding Impaired Financing Receivables Recorded Investment LoansAndLeasesReceivableExcludingImpairedFinancingReceivablesRecordedInvestment	14203738000	USD
CY2018Q4	us-gaap	Impaired Financing Receivable Related Allowance ImpairedFinancingReceivableRelatedAllowance	2696000	USD
CY2018Q4	us-gaap	Impaired Financing Receivable Recorded Investment ImpairedFinancingReceivableRecordedInvestment	78616000	USD
CY2018Q4	cbsh	Loans And Leases Receivable Allowance Excluding Impaired Financing Receivable Related Allowance LoansAndLeasesReceivableAllowanceExcludingImpairedFinancingReceivableRelatedAllowance	157236000	USD
CY2018Q4	cbsh	Loans And Leases Receivable Excluding Impaired Financing Receivables Recorded Investment LoansAndLeasesReceivableExcludingImpairedFinancingReceivablesRecordedInvestment	14061682000	USD
CY2018Q2	cbsh	Financing Receivable Modifications Average Recorded Investment FinancingReceivableModificationsAverageRecordedInvestment	98954000	USD
CY2019Q2	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	11133000	USD
CY2018Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	12536000	USD
CY2019Q2	cbsh	Accruing Restructured Loans AccruingRestructuredLoans	45377000	USD
CY2018Q4	cbsh	Accruing Restructured Loans AccruingRestructuredLoans	66080000	USD
CY2019Q2	us-gaap	Impaired Financing Receivable Recorded Investment ImpairedFinancingReceivableRecordedInvestment	56510000	USD
CY2018Q4	us-gaap	Impaired Financing Receivable Recorded Investment ImpairedFinancingReceivableRecordedInvestment	78616000	USD
CY2019Q2	us-gaap	Impaired Financing Receivable With No Related Allowance Recorded Investment ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment	8298000	USD
CY2019Q2	us-gaap	Impaired Financing Receivable With No Related Allowance Unpaid Principal Balance ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance	14582000	USD
CY2019Q2	cbsh	Impaired Financing Receivablewith No Related Allowance Allowance ImpairedFinancingReceivablewithNoRelatedAllowanceAllowance	0	USD
CY2019Q2	us-gaap	Impaired Financing Receivable With Related Allowance Recorded Investment ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment	48212000	USD
CY2019Q2	us-gaap	Impaired Financing Receivable With Related Allowance Unpaid Principal Balance ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance	50112000	USD
CY2019Q2	us-gaap	Impaired Financing Receivable Related Allowance ImpairedFinancingReceivableRelatedAllowance	1903000	USD
CY2019Q2	us-gaap	Impaired Financing Receivable Recorded Investment ImpairedFinancingReceivableRecordedInvestment	56510000	USD
CY2019Q2	us-gaap	Impaired Financing Receivable Unpaid Principal Balance ImpairedFinancingReceivableUnpaidPrincipalBalance	64694000	USD
CY2019Q2	us-gaap	Impaired Financing Receivable Related Allowance ImpairedFinancingReceivableRelatedAllowance	1903000	USD
CY2018Q4	us-gaap	Impaired Financing Receivable With No Related Allowance Recorded Investment ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment	8725000	USD
CY2018Q4	us-gaap	Impaired Financing Receivable With No Related Allowance Unpaid Principal Balance ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance	14477000	USD
CY2018Q4	cbsh	Impaired Financing Receivablewith No Related Allowance Allowance ImpairedFinancingReceivablewithNoRelatedAllowanceAllowance	0	USD
CY2018Q4	us-gaap	Impaired Financing Receivable With Related Allowance Recorded Investment ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment	69891000	USD
CY2018Q4	us-gaap	Impaired Financing Receivable With Related Allowance Unpaid Principal Balance ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance	72597000	USD
CY2018Q4	us-gaap	Impaired Financing Receivable Related Allowance ImpairedFinancingReceivableRelatedAllowance	2696000	USD
CY2018Q4	us-gaap	Impaired Financing Receivable Recorded Investment ImpairedFinancingReceivableRecordedInvestment	78616000	USD
CY2018Q4	us-gaap	Impaired Financing Receivable Unpaid Principal Balance ImpairedFinancingReceivableUnpaidPrincipalBalance	87074000	USD
CY2018Q4	us-gaap	Impaired Financing Receivable Related Allowance ImpairedFinancingReceivableRelatedAllowance	2696000	USD
CY2019Q2	cbsh	Financing Receivable Average Recorded Investment Nonaccrual Status FinancingReceivableAverageRecordedInvestmentNonaccrualStatus	11996000	USD
CY2019Q2	cbsh	Financing Receivable Modifications Average Recorded Investment FinancingReceivableModificationsAverageRecordedInvestment	53352000	USD
CY2019Q2	us-gaap	Impaired Financing Receivable Average Recorded Investment ImpairedFinancingReceivableAverageRecordedInvestment	65348000	USD
	cbsh	Financing Receivable Average Recorded Investment Nonaccrual Status FinancingReceivableAverageRecordedInvestmentNonaccrualStatus	12157000	USD
	cbsh	Financing Receivable Modifications Average Recorded Investment FinancingReceivableModificationsAverageRecordedInvestment	61155000	USD
	us-gaap	Impaired Financing Receivable Average Recorded Investment ImpairedFinancingReceivableAverageRecordedInvestment	73312000	USD
CY2018Q2	cbsh	Financing Receivable Average Recorded Investment Nonaccrual Status FinancingReceivableAverageRecordedInvestmentNonaccrualStatus	9681000	USD
CY2018Q2	us-gaap	Impaired Financing Receivable Average Recorded Investment ImpairedFinancingReceivableAverageRecordedInvestment	108635000	USD
	cbsh	Financing Receivable Average Recorded Investment Nonaccrual Status FinancingReceivableAverageRecordedInvestmentNonaccrualStatus	10561000	USD
	cbsh	Financing Receivable Modifications Average Recorded Investment FinancingReceivableModificationsAverageRecordedInvestment	98495000	USD
	us-gaap	Impaired Financing Receivable Average Recorded Investment ImpairedFinancingReceivableAverageRecordedInvestment	109056000	USD
CY2019Q2	us-gaap	Impaired Financing Receivable Interest Income Accrual Method ImpairedFinancingReceivableInterestIncomeAccrualMethod	742000	USD
CY2018Q2	us-gaap	Impaired Financing Receivable Interest Income Accrual Method ImpairedFinancingReceivableInterestIncomeAccrualMethod	1284000	USD
	us-gaap	Impaired Financing Receivable Interest Income Accrual Method ImpairedFinancingReceivableInterestIncomeAccrualMethod	1480000	USD
	us-gaap	Impaired Financing Receivable Interest Income Accrual Method ImpairedFinancingReceivableInterestIncomeAccrualMethod	2565000	USD
CY2019Q2	cbsh	Financing Receivable Recorded Investment Currentor Lessthan30days Past Due FinancingReceivableRecordedInvestmentCurrentorLessthan30daysPastDue	14128904000	USD
CY2019Q2	cbsh	Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due FinancingReceivableRecordedInvestmentThirtyToEightyNineDaysPastDue	103679000	USD
CY2019Q2	us-gaap	Financing Receivable Recorded Investment90 Days Past Due And Still Accruing FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing	16532000	USD
CY2019Q2	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	11133000	USD
CY2019Q2	us-gaap	Loans And Leases Receivable Gross Carrying Amount LoansAndLeasesReceivableGrossCarryingAmount	14260248000	USD
CY2018Q4	cbsh	Financing Receivable Recorded Investment Currentor Lessthan30days Past Due FinancingReceivableRecordedInvestmentCurrentorLessthan30daysPastDue	14038417000	USD
CY2018Q4	cbsh	Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due FinancingReceivableRecordedInvestmentThirtyToEightyNineDaysPastDue	72687000	USD
CY2018Q4	us-gaap	Financing Receivable Recorded Investment90 Days Past Due And Still Accruing FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing	16658000	USD
CY2018Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	12536000	USD
CY2018Q4	us-gaap	Loans And Leases Receivable Gross Carrying Amount LoansAndLeasesReceivableGrossCarryingAmount	14140298000	USD
CY2019Q2	cbsh	Credit Quality Personal Real Estate Loans Excluded CreditQualityPersonalRealEstateLoansExcluded	193100000	USD
CY2018Q4	cbsh	Credit Quality Personal Real Estate Loans Excluded CreditQualityPersonalRealEstateLoansExcluded	201700000	USD
CY2019Q2	cbsh	Consumer Healthcare Loans Excluded ConsumerHealthcareLoansExcluded	173200000	USD
CY2018Q4	cbsh	Consumer Healthcare Loans Excluded ConsumerHealthcareLoansExcluded	170300000	USD
CY2019Q2	cbsh	Credit Quality Personal Banking Loan Table Percentage Loans Excluded CreditQualityPersonalBankingLoanTablePercentageLoansExcluded	0.08	Rate
CY2019Q2	us-gaap	Financing Receivable Modifications Recorded Investment FinancingReceivableModificationsRecordedInvestment	53824000	USD
CY2018Q4	us-gaap	Financing Receivable Modifications Recorded Investment FinancingReceivableModificationsRecordedInvestment	75839000	USD
	cbsh	Period After Which Loans Are Deemed In Default PeriodAfterWhichLoansAreDeemedInDefault	P90D
CY2019Q2	us-gaap	Financing Receivable Modifications Recorded Investment FinancingReceivableModificationsRecordedInvestment	53824000	USD
CY2019Q2	cbsh	Financing Receivable Troubled Debt Restructurings That Subsequently Defaulted Recorded Investment FinancingReceivableTroubledDebtRestructuringsThatSubsequentlyDefaultedRecordedInvestment	1143000	USD
	cbsh	Effect On Interest Income Resulting From Modification To Credit Card Loans EffectOnInterestIncomeResultingFromModificationToCreditCardLoans	1100000	USD
CY2019Q2	us-gaap	Loans And Leases Receivable Impaired Commitment To Lend LoansAndLeasesReceivableImpairedCommitmentToLend	3600000	USD
CY2019Q2	us-gaap	Loans Held For Sale Fair Value Disclosure LoansHeldForSaleFairValueDisclosure	9300000	USD
CY2019Q2	cbsh	Unpaid Principal Balanceon Personal Real Estate Loans Heldfor Sale UnpaidPrincipalBalanceonPersonalRealEstateLoansHeldforSale	8900000	USD
CY2019Q2	cbsh	Student Loans Heldfor Sale Lowerof Costor Fair Value StudentLoansHeldforSaleLowerofCostorFairValue	10800000	USD
CY2019Q2	cbsh	Hfs Loansonnonaccrualstatus HFSLoansonnonaccrualstatus	0	USD
CY2019Q2	us-gaap	Real Estate Acquired Through Foreclosure RealEstateAcquiredThroughForeclosure	897000	USD
CY2018Q4	us-gaap	Real Estate Acquired Through Foreclosure RealEstateAcquiredThroughForeclosure	1400000	USD
CY2019Q2	us-gaap	Other Foreclosed Assets OtherForeclosedAssets	2000000.0	USD
CY2019Q2	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	8682303000	USD
CY2018Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	8538041000	USD
CY2019Q2	us-gaap	Trading Securities TradingSecurities	36508000	USD
CY2018Q4	us-gaap	Trading Securities TradingSecurities	27059000	USD
CY2019Q2	us-gaap	Equity Securities Fv Ni EquitySecuritiesFvNi	2847000	USD
CY2018Q4	us-gaap	Equity Securities Fv Ni EquitySecuritiesFvNi	2585000	USD
CY2019Q2	cbsh	Equtiy Securitieswithout Readily Determinable Fair Values EqutiySecuritieswithoutReadilyDeterminableFairValues	1897000	USD
CY2018Q4	cbsh	Equtiy Securitieswithout Readily Determinable Fair Values EqutiySecuritieswithoutReadilyDeterminableFairValues	1824000	USD
CY2019Q2	us-gaap	Federal Reserve Bank Stock FederalReserveBankStock	33627000	USD
CY2018Q4	us-gaap	Federal Reserve Bank Stock FederalReserveBankStock	33498000	USD
CY2019Q2	us-gaap	Federal Home Loan Bank Stock FederalHomeLoanBankStock	10000000	USD
CY2017Q4	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Credit Losses On Debt Securities Held OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld	14199000	USD
CY2018Q4	us-gaap	Federal Home Loan Bank Stock FederalHomeLoanBankStock	10000000	USD
CY2019Q2	cbsh	Private Equity Investments PrivateEquityInvestments	86411000	USD
CY2018Q4	cbsh	Private Equity Investments PrivateEquityInvestments	85659000	USD
CY2019Q2	cbsh	Total Investment Securities TotalInvestmentSecurities	8853593000	USD
CY2018Q4	cbsh	Total Investment Securities TotalInvestmentSecurities	8698666000	USD
CY2019Q2	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	8546590000	USD
CY2019Q2	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	8682303000	USD
CY2019Q2	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	8546590000	USD
CY2019Q2	cbsh	Available For Sale Securities Gross Unreailzed Gainat Period End AvailableForSaleSecuritiesGrossUnreailzedGainatPeriodEnd	145659000	USD
CY2019Q2	cbsh	Available For Sale Securities Gross Unrealized Lossat Period End AvailableForSaleSecuritiesGrossUnrealizedLossatPeriodEnd	9946000	USD
CY2019Q2	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	8682303000	USD
CY2018Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	8602599000	USD
CY2018Q4	cbsh	Available For Sale Securities Gross Unreailzed Gainat Period End AvailableForSaleSecuritiesGrossUnreailzedGainatPeriodEnd	35266000	USD
CY2018Q4	cbsh	Available For Sale Securities Gross Unrealized Lossat Period End AvailableForSaleSecuritiesGrossUnrealizedLossatPeriodEnd	99824000	USD
CY2018Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	8538041000	USD
	cbsh	Percentage Decrease In Fair Value Below Amortized Cost PercentageDecreaseInFairValueBelowAmortizedCost	0.20
CY2019Q2	cbsh	Fair Value Securities On Other Than Temporary Impairment Watch List FairValueSecuritiesOnOtherThanTemporaryImpairmentWatchList	50600000	USD
CY2018Q4	cbsh	Fair Value Securities On Other Than Temporary Impairment Watch List FairValueSecuritiesOnOtherThanTemporaryImpairmentWatchList	57700000	USD
CY2018Q4	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Credit Losses On Debt Securities Held OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld	14092000	USD
	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Additions No Previous Impairment OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionsNoPreviousImpairment	48000	USD
	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Additions No Previous Impairment OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionsNoPreviousImpairment	58000	USD
	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Additions Additional Credit Losses OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionsAdditionalCreditLosses	15000	USD
	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Additions Additional Credit Losses OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionsAdditionalCreditLosses	10000	USD
	cbsh	Proceedsfromsalesandmaturitiesofavailableforsaledebtequityandothersecurities Proceedsfromsalesandmaturitiesofavailableforsaledebtequityandothersecurities	375462000	USD
	cbsh	Proceedsfromsalesandmaturitiesofavailableforsaledebtequityandothersecurities Proceedsfromsalesandmaturitiesofavailableforsaledebtequityandothersecurities	192522000	USD
	us-gaap	Gain Loss On Investments GainLossOnInvestments	-1035000	USD
	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Reductions Cash Flows OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionsCashFlows	564000	USD
	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Reductions Cash Flows OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionsCashFlows	104000	USD
CY2019Q2	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Credit Losses On Debt Securities Held OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld	13591000	USD
CY2018Q2	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Credit Losses On Debt Securities Held OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld	14163000	USD
CY2019Q2	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue	431911000	USD
CY2019Q2	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	1841000	USD
CY2019Q2	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue	1491101000	USD
CY2019Q2	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	8105000	USD
CY2019Q2	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue	1923012000	USD
CY2019Q2	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Accumulated Loss AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss	9946000	USD
CY2018Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue	1213809000	USD
CY2018Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	11098000	USD
CY2018Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue	4221687000	USD
CY2018Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	88726000	USD
CY2018Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue	5435496000	USD
CY2018Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Accumulated Loss AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss	99824000	USD
CY2019Q2	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue	1900000000	USD
CY2018Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue	5400000000	USD
CY2019Q2	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Accumulated Loss AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss	9900000	USD
	cbsh	Af Ssecuritiesinlosspositionatperiodendchangeinunrealizedloss AFSsecuritiesinlosspositionatperiodendchangeinunrealizedloss	89900000	USD
	us-gaap	Proceeds From Sale Of Available For Sale Securities ProceedsFromSaleOfAvailableForSaleSecurities	368219000	USD
	us-gaap	Proceeds From Sale Of Available For Sale Securities ProceedsFromSaleOfAvailableForSaleSecurities	152541000	USD
	cbsh	Proceedsfromsaleofequitysecurities Proceedsfromsaleofequitysecurities	0	USD
	cbsh	Proceedsfromsaleofequitysecurities Proceedsfromsaleofequitysecurities	39981000	USD
	cbsh	Proceeds From Sale Of Other Securities ProceedsFromSaleOfOtherSecurities	7243000	USD
	cbsh	Proceeds From Sale Of Other Securities ProceedsFromSaleOfOtherSecurities	0	USD
	us-gaap	Gain Loss On Investments GainLossOnInvestments	2335000	USD
CY2019Q2	cbsh	Investment Securities Pledged At Fair Value InvestmentSecuritiesPledgedAtFairValue	4700000000	USD
CY2019Q2	us-gaap	Financial Instruments Owned And Pledged As Collateral Amount Eligible To Be Repledged By Counterparty FinancialInstrumentsOwnedAndPledgedAsCollateralAmountEligibleToBeRepledgedByCounterparty	205300000	USD
CY2019Q2	cbsh	Investments Exceeding Ten Percent Of Stockholders Equity InvestmentsExceedingTenPercentOfStockholdersEquity	0
CY2019Q2	cbsh	Percentage Of Stockholders Equity Of Which No Investment From Single Issuer Exceeds PercentageOfStockholdersEquityOfWhichNoInvestmentFromSingleIssuerExceeds	0.10
CY2019Q2	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	42602000	USD
CY2019Q2	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	33530000	USD
CY2019Q2	us-gaap	Valuation Allowances And Reserves Balance ValuationAllowancesAndReservesBalance	309000	USD
CY2019Q2	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	8763000	USD
CY2018Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	41609000	USD
CY2018Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	32815000	USD
CY2018Q4	us-gaap	Valuation Allowances And Reserves Balance ValuationAllowancesAndReservesBalance	0	USD
CY2018Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	8794000	USD
CY2019Q2	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	373000	USD
CY2018Q2	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	313000	USD
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	715000	USD
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	634000	USD
CY2019Q2	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	1442000	USD
CY2019Q2	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	1316000	USD
CY2019Q2	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	1108000	USD
CY2019Q2	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	941000	USD
CY2019Q2	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	782000	USD
CY2019Q2	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	27000000.0	USD
CY2019Q2	us-gaap	Operating Lease Liability OperatingLeaseLiability	27600000	USD
CY2019Q2	us-gaap	Goodwill Goodwill	138921000	USD
CY2019Q2	us-gaap	Lease Cost LeaseCost	1800000	USD
	us-gaap	Lease Cost LeaseCost	3600000	USD
CY2019Q2	us-gaap	Lessee Operating Lease Liability Payments Remainder Of Fiscal Year LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear	2885000	USD
CY2019Q2	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	5261000	USD
CY2019Q2	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	4437000	USD
CY2019Q2	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	3955000	USD
CY2019Q2	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	3633000	USD
CY2019Q2	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	14988000	USD
CY2019Q2	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	35159000	USD
CY2019Q2	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	7542000	USD
CY2019Q2	us-gaap	Operating Lease Liability OperatingLeaseLiability	27617000	USD
CY2019Q2	us-gaap	Unrecorded Unconditional Purchase Obligation Balance Sheet Amount UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount	2500000	USD
CY2019Q2	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P11Y10M24D
CY2019Q2	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.0374
CY2019Q2	us-gaap	Operating Lease Payments OperatingLeasePayments	1550000	USD
	us-gaap	Operating Lease Payments OperatingLeasePayments	3041000	USD
CY2019Q2	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	1070000	USD
	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	2092000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due Current OperatingLeasesFutureMinimumPaymentsDueCurrent	5763000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	4817000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due In Three Years OperatingLeasesFutureMinimumPaymentsDueInThreeYears	4055000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due In Four Years OperatingLeasesFutureMinimumPaymentsDueInFourYears	3598000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due In Five Years OperatingLeasesFutureMinimumPaymentsDueInFiveYears	3273000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due Thereafter OperatingLeasesFutureMinimumPaymentsDueThereafter	15161000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due OperatingLeasesFutureMinimumPaymentsDue	36667000	USD
CY2019Q2	us-gaap	Sales Type And Direct Financing Leases Profit Loss SalesTypeAndDirectFinancingLeasesProfitLoss	6034000	USD
	us-gaap	Sales Type And Direct Financing Leases Profit Loss SalesTypeAndDirectFinancingLeasesProfitLoss	11896000	USD
CY2019Q2	us-gaap	Operating Lease Lease Income OperatingLeaseLeaseIncome	1926000	USD
	us-gaap	Operating Lease Lease Income OperatingLeaseLeaseIncome	3832000	USD
CY2019Q2	us-gaap	Lease Income LeaseIncome	7960000	USD
	us-gaap	Lease Income LeaseIncome	15728000	USD
CY2019Q2	us-gaap	Sales Type And Direct Financing Leases Lease Receivable SalesTypeAndDirectFinancingLeasesLeaseReceivable	720498000	USD
CY2019Q2	cbsh	Salestypeand Direct Financing Leases Unguaranteed Residual Asset SalestypeandDirectFinancingLeasesUnguaranteedResidualAsset	53472000	USD
CY2019Q2	us-gaap	Net Investment In Lease NetInvestmentInLease	773970000	USD
CY2019Q2	us-gaap	Deferred Costs Leasing Net DeferredCostsLeasingNet	3118000	USD
CY2019Q2	us-gaap	Net Investment In Direct Financing And Sales Type Leases NetInvestmentInDirectFinancingAndSalesTypeLeases	777088000	USD
CY2019Q2	us-gaap	Sales Type And Direct Financing Leases Lease Receivable Payments To Be Received Remainder Of Fiscal Year SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedRemainderOfFiscalYear	123242000	USD
CY2019Q2	us-gaap	Lessor Operating Lease Payments To Be Received Remainder Of Fiscal Year LessorOperatingLeasePaymentsToBeReceivedRemainderOfFiscalYear	3779000	USD
CY2019Q2	cbsh	Lessor Total Paymentstobe Received Remainderof Fiscal Year LessorTotalPaymentstobeReceivedRemainderofFiscalYear	127021000	USD
CY2019Q2	us-gaap	Sales Type And Direct Financing Leases Lease Receivable Payments To Be Received Two Years SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedTwoYears	190992000	USD
CY2019Q2	us-gaap	Lessor Operating Lease Payments To Be Received Two Years LessorOperatingLeasePaymentsToBeReceivedTwoYears	7346000	USD
CY2019Q2	cbsh	Lessor Total Paymentstobe Received Two Years LessorTotalPaymentstobeReceivedTwoYears	198338000	USD
CY2019Q2	us-gaap	Sales Type And Direct Financing Leases Lease Receivable Payments To Be Received Three Years SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedThreeYears	148271000	USD
CY2019Q2	us-gaap	Lessor Operating Lease Payments To Be Received Three Years LessorOperatingLeasePaymentsToBeReceivedThreeYears	7250000	USD
CY2019Q2	cbsh	Lessor Total Paymentstobe Received Three Years LessorTotalPaymentstobeReceivedThreeYears	155521000	USD
CY2019Q2	us-gaap	Sales Type And Direct Financing Leases Lease Receivable Payments To Be Received Four Years SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedFourYears	108230000	USD
CY2019Q2	us-gaap	Lessor Operating Lease Payments To Be Received Four Years LessorOperatingLeasePaymentsToBeReceivedFourYears	13557000	USD
CY2019Q2	cbsh	Lessor Total Paymentstobe Received Four Years LessorTotalPaymentstobeReceivedFourYears	121787000	USD
CY2019Q2	us-gaap	Sales Type And Direct Financing Leases Lease Receivable Payments To Be Received Five Years SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedFiveYears	78243000	USD
CY2019Q2	us-gaap	Lessor Operating Lease Payments To Be Received Five Years LessorOperatingLeasePaymentsToBeReceivedFiveYears	5081000	USD
CY2019Q2	cbsh	Lessor Total Paymentstobe Received Five Years LessorTotalPaymentstobeReceivedFiveYears	83324000	USD
CY2019Q2	us-gaap	Sales Type And Direct Financing Leases Lease Receivable Payments To Be Received Thereafter SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedThereafter	135256000	USD
CY2019Q2	us-gaap	Lessor Operating Lease Payments To Be Received Thereafter LessorOperatingLeasePaymentsToBeReceivedThereafter	13084000	USD
CY2019Q2	cbsh	Lessor Total Paymentstobe Received Thereafter LessorTotalPaymentstobeReceivedThereafter	148340000	USD
CY2019Q2	us-gaap	Sales Type And Direct Financing Leases Lease Receivable Payments To Be Received SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceived	784234000	USD
CY2019Q2	us-gaap	Lessor Operating Lease Payments To Be Received LessorOperatingLeasePaymentsToBeReceived	50097000	USD
CY2019Q2	cbsh	Lessor Total Paymentstobe Received LessorTotalPaymentstobeReceived	834331000	USD
CY2019Q2	us-gaap	Sales Type And Direct Financing Leases Lease Receivable Undiscounted Excess Amount SalesTypeAndDirectFinancingLeasesLeaseReceivableUndiscountedExcessAmount	63736000	USD
CY2019Q2	us-gaap	Sales Type And Direct Financing Leases Lease Receivable SalesTypeAndDirectFinancingLeasesLeaseReceivable	720498000	USD
CY2019Q2	us-gaap	Defined Benefit Plan Service Cost DefinedBenefitPlanServiceCost	159000	USD
CY2018Q2	us-gaap	Defined Benefit Plan Service Cost DefinedBenefitPlanServiceCost	152000	USD
	us-gaap	Defined Benefit Plan Service Cost DefinedBenefitPlanServiceCost	318000	USD
	us-gaap	Defined Benefit Plan Service Cost DefinedBenefitPlanServiceCost	305000	USD
CY2019Q2	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	1065000	USD
CY2018Q2	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	951000	USD
	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	2130000	USD
	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	1901000	USD
CY2019Q2	us-gaap	Defined Benefit Plan Expected Return On Plan Assets DefinedBenefitPlanExpectedReturnOnPlanAssets	1197000	USD
CY2018Q2	us-gaap	Defined Benefit Plan Expected Return On Plan Assets DefinedBenefitPlanExpectedReturnOnPlanAssets	1438000	USD
	us-gaap	Defined Benefit Plan Expected Return On Plan Assets DefinedBenefitPlanExpectedReturnOnPlanAssets	2393000	USD
	us-gaap	Defined Benefit Plan Expected Return On Plan Assets DefinedBenefitPlanExpectedReturnOnPlanAssets	2875000	USD
CY2019Q2	us-gaap	Defined Benefit Plan Amortization Of Prior Service Cost Credit DefinedBenefitPlanAmortizationOfPriorServiceCostCredit	-67000	USD
CY2018Q2	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	-135000	USD
	us-gaap	Defined Benefit Plan Amortization Of Prior Service Cost Credit DefinedBenefitPlanAmortizationOfPriorServiceCostCredit	-135000	USD
CY2019Q2	us-gaap	Defined Benefit Plan Amortization Of Gains Losses DefinedBenefitPlanAmortizationOfGainsLosses	-585000	USD
CY2018Q2	us-gaap	Defined Benefit Plan Amortization Of Gains Losses DefinedBenefitPlanAmortizationOfGainsLosses	-592000	USD
	us-gaap	Defined Benefit Plan Amortization Of Gains Losses DefinedBenefitPlanAmortizationOfGainsLosses	-1171000	USD
	us-gaap	Defined Benefit Plan Amortization Of Gains Losses DefinedBenefitPlanAmortizationOfGainsLosses	-1184000	USD
CY2019Q2	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	545000	USD
CY2018Q2	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	190000	USD
	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	1091000	USD
	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	380000	USD
	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	322000	shares
	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	308000	shares
CY2019Q1	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	120000000	shares
CY2019Q2	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	140000000	shares
CY2018Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-64669000	USD
	us-gaap	Other Comprehensive Income Loss Before Reclassifications Before Tax OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax	229303000	USD
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	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	57854000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	173567000	USD
	cbsh	Reclassification Where Impairment Was Not Previously Recognized ReclassificationWhereImpairmentWasNotPreviouslyRecognized	0	USD
CY2019Q2	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	108898000	USD
CY2017Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	14108000	USD
	us-gaap	Other Comprehensive Income Loss Before Reclassifications Before Tax OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax	-124027000	USD
	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Before Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax	-693000	USD
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	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	-30833000	USD
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CY2018Q2	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-108781000	USD
	us-gaap	Number Of Operating Segments NumberOfOperatingSegments	3
CY2019Q2	cbsh	Number Of Locations NumberOfLocations	165	Locations
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CY2019Q2	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	211634000	USD
CY2019Q2	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	11806000	USD
CY2019Q2	us-gaap	Noninterest Income NoninterestIncome	127259000	USD
CY2019Q2	us-gaap	Gain Loss On Investments GainLossOnInvestments	-110000	USD
CY2019Q2	us-gaap	Noninterest Expense NoninterestExpense	189779000	USD
CY2019Q2	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	137198000	USD
	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	415122000	USD
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	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	257113000	USD
CY2018Q2	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	210959000	USD
CY2018Q2	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	10043000	USD
CY2018Q2	us-gaap	Noninterest Income NoninterestIncome	124850000	USD
CY2018Q2	us-gaap	Gain Loss On Investments GainLossOnInvestments	-3075000	USD
CY2018Q2	us-gaap	Noninterest Expense NoninterestExpense	181860000	USD
CY2018Q2	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	140831000	USD
	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	403851000	USD
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	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	266150000	USD
CY2019Q2	invest	Derivative Notional Amount DerivativeNotionalAmount	3956374000	USD
CY2018Q4	invest	Derivative Notional Amount DerivativeNotionalAmount	3254921000	USD
CY2019Q2	us-gaap	Derivative Assets DerivativeAssets	106430000	USD
CY2018Q4	us-gaap	Derivative Assets DerivativeAssets	41210000	USD
CY2019Q2	us-gaap	Derivative Liabilities DerivativeLiabilities	10012000	USD
CY2018Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	13421000	USD
CY2019Q2	us-gaap	Derivative Asset Fair Value Gross Asset Including Not Subject To Master Netting Arrangement DerivativeAssetFairValueGrossAssetIncludingNotSubjectToMasterNettingArrangement	106430000	USD
CY2019Q2	cbsh	Derivative Asset Amount Offset By Liabiilty DerivativeAssetAmountOffsetByLiabiilty	0	USD
CY2019Q2	us-gaap	Derivative Assets DerivativeAssets	106430000	USD
CY2019Q2	us-gaap	Derivative Liability Fair Value Gross Liability Including Not Subject To Master Netting Arrangement DerivativeLiabilityFairValueGrossLiabilityIncludingNotSubjectToMasterNettingArrangement	10012000	USD
CY2019Q2	cbsh	Derivative Liability Amount Offset By Asset DerivativeLiabilityAmountOffsetByAsset	0	USD
CY2019Q2	us-gaap	Derivative Liabilities DerivativeLiabilities	10012000	USD
CY2018Q4	us-gaap	Derivative Asset Fair Value Gross Asset Including Not Subject To Master Netting Arrangement DerivativeAssetFairValueGrossAssetIncludingNotSubjectToMasterNettingArrangement	41210000	USD
CY2018Q4	cbsh	Derivative Asset Amount Offset By Liabiilty DerivativeAssetAmountOffsetByLiabiilty	0	USD
CY2018Q4	us-gaap	Derivative Assets DerivativeAssets	41210000	USD
CY2018Q4	us-gaap	Derivative Liability Fair Value Gross Liability Including Not Subject To Master Netting Arrangement DerivativeLiabilityFairValueGrossLiabilityIncludingNotSubjectToMasterNettingArrangement	13421000	USD
CY2018Q4	cbsh	Derivative Liability Amount Offset By Asset DerivativeLiabilityAmountOffsetByAsset	0	USD
CY2018Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	13421000	USD
CY2019Q2	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	3400000	USD
CY2018Q2	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	3100000	USD
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	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	6400000	USD
CY2018Q4	cbsh	Nonvested Share Awards Balances NonvestedShareAwardsBalances	1180940	shares
CY2018Q4	cbsh	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Nonvested Share Awards Weighted Average Grant Date Unit Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsNonvestedShareAwardsWeightedAverageGrantDateUnitFairValue	43.24
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	cbsh	Nonvested Share Awards Forfeited In Period NonvestedShareAwardsForfeitedInPeriod	9974	shares
	cbsh	Share Based Compensation Forfeited Nonvested Share Award Weighted Average Grant Date Fair Value ShareBasedCompensationForfeitedNonvestedShareAwardWeightedAverageGrantDateFairValue	48.48
CY2019Q2	cbsh	Nonvested Share Awards Balances NonvestedShareAwardsBalances	1052067	shares
CY2019Q2	cbsh	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Nonvested Share Awards Weighted Average Grant Date Unit Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsNonvestedShareAwardsWeightedAverageGrantDateUnitFairValue	49.52
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	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate	0.026
	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Fair Value Assumptions Expected Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1	P6Y
CY2018Q4	cbsh	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Number ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNumber	1066438	shares
CY2018Q4	cbsh	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsWeightedAverageExercisePrice	40.22
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod	186825	shares
	cbsh	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageExercisePrice	61.76
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeited In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod	4610	shares
	cbsh	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeited In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriodWeightedAverageExercisePrice	51.27
	cbsh	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Expired In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpiredInPeriod	682	shares
	cbsh	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Expired In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpiredInPeriodWeightedAverageExercisePrice	41.81
	cbsh	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Exercised In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisedInPeriod	115619	shares
	cbsh	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Exercised In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisedInPeriodWeightedAverageExercisePrice	34.16
CY2019Q2	cbsh	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Number ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNumber	1132352	shares
CY2019Q2	cbsh	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsWeightedAverageExercisePrice	44.35
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Outstanding Weighted Average Remaining Contractual Terms ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageRemainingContractualTerms	P6Y10M24D
CY2019Q2	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Equity Instruments Other Than Options Aggregate Intrinsic Value Outstanding SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueOutstanding	17726000	USD
	cbsh	Percentof Revenuenotinscopeof Asc606 PercentofRevenuenotinscopeofASC606	0.63	Rate
CY2019Q2	us-gaap	Noninterest Income NoninterestIncome	127259000	USD
CY2018Q2	us-gaap	Noninterest Income NoninterestIncome	124850000	USD
	us-gaap	Noninterest Income NoninterestIncome	248499000	USD
	us-gaap	Noninterest Income NoninterestIncome	244540000	USD
CY2019Q2	cbsh	Us Government Sponsored Enterprises Debt Securities USGovernmentSponsoredEnterprisesDebtSecurities	200137000	USD
CY2019Q2	us-gaap	Mortgages Held For Sale Fair Value Disclosure MortgagesHeldForSaleFairValueDisclosure	9285000	USD
CY2019Q2	us-gaap	Financial Instruments Owned Us Government And Agency Obligations At Fair Value FinancialInstrumentsOwnedUSGovernmentAndAgencyObligationsAtFairValue	845939000	USD
CY2019Q2	us-gaap	Financial Instruments Owned State And Municipal Government Obligations At Fair Value FinancialInstrumentsOwnedStateAndMunicipalGovernmentObligationsAtFairValue	1237456000	USD
CY2019Q2	cbsh	Financial Instruments Owned Agency Mortgage Backed Securities At Fair Value FinancialInstrumentsOwnedAgencyMortgageBackedSecuritiesAtFairValue	3729632000	USD
CY2019Q2	cbsh	Financial Instruments Owned Non Agency Mortgage Backed Securities At Fair Value FinancialInstrumentsOwnedNonAgencyMortgageBackedSecuritiesAtFairValue	1010667000	USD
CY2019Q2	cbsh	Other Asset Backed Securities Disclosure OtherAssetBackedSecuritiesDisclosure	1326178000	USD
CY2019Q2	cbsh	Financial Instruments Owned Other Debt Securities At Fair Value FinancialInstrumentsOwnedOtherDebtSecuritiesAtFairValue	332294000	USD
CY2019Q2	us-gaap	Trading Securities TradingSecurities	36508000	USD
CY2019Q2	us-gaap	Equity Securities Fv Ni EquitySecuritiesFvNi	2847000	USD
CY2019Q2	us-gaap	Financial Instruments Owned Principal Investments At Fair Value FinancialInstrumentsOwnedPrincipalInvestmentsAtFairValue	86411000	USD
CY2019Q2	us-gaap	Derivative Assets DerivativeAssets	106430000	USD
CY2019Q2	us-gaap	Deferred Compensation Plan Assets DeferredCompensationPlanAssets	15445000	USD
CY2019Q2	us-gaap	Assets Fair Value Disclosure AssetsFairValueDisclosure	8939229000	USD
CY2019Q2	us-gaap	Derivative Liabilities DerivativeLiabilities	10012000	USD
CY2019Q2	us-gaap	Deferred Compensation Liability Current And Noncurrent DeferredCompensationLiabilityCurrentAndNoncurrent	15445000	USD
CY2019Q2	us-gaap	Liabilities Fair Value Disclosure LiabilitiesFairValueDisclosure	25457000	USD
CY2018Q4	us-gaap	Mortgages Held For Sale Fair Value Disclosure MortgagesHeldForSaleFairValueDisclosure	13529000	USD
CY2018Q4	us-gaap	Financial Instruments Owned Us Government And Agency Obligations At Fair Value FinancialInstrumentsOwnedUSGovernmentAndAgencyObligationsAtFairValue	907652000	USD
CY2018Q4	cbsh	Us Government Sponsored Enterprises Debt Securities USGovernmentSponsoredEnterprisesDebtSecurities	195778000	USD
CY2018Q4	us-gaap	Financial Instruments Owned State And Municipal Government Obligations At Fair Value FinancialInstrumentsOwnedStateAndMunicipalGovernmentObligationsAtFairValue	1328039000	USD
CY2018Q4	cbsh	Financial Instruments Owned Agency Mortgage Backed Securities At Fair Value FinancialInstrumentsOwnedAgencyMortgageBackedSecuritiesAtFairValue	3214985000	USD
CY2018Q4	cbsh	Financial Instruments Owned Non Agency Mortgage Backed Securities At Fair Value FinancialInstrumentsOwnedNonAgencyMortgageBackedSecuritiesAtFairValue	1047716000	USD
CY2018Q4	cbsh	Other Asset Backed Securities Disclosure OtherAssetBackedSecuritiesDisclosure	1511614000	USD
CY2018Q4	cbsh	Financial Instruments Owned Other Debt Securities At Fair Value FinancialInstrumentsOwnedOtherDebtSecuritiesAtFairValue	332257000	USD
CY2018Q4	us-gaap	Trading Securities TradingSecurities	27059000	USD
CY2018Q4	us-gaap	Equity Securities Fv Ni EquitySecuritiesFvNi	2585000	USD
CY2018Q4	us-gaap	Financial Instruments Owned Principal Investments At Fair Value FinancialInstrumentsOwnedPrincipalInvestmentsAtFairValue	85659000	USD
CY2018Q4	us-gaap	Derivative Assets DerivativeAssets	41210000	USD
CY2018Q4	us-gaap	Deferred Compensation Plan Assets DeferredCompensationPlanAssets	12968000	USD
CY2018Q4	us-gaap	Assets Fair Value Disclosure AssetsFairValueDisclosure	8721051000	USD
CY2018Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	13421000	USD
CY2018Q4	us-gaap	Deferred Compensation Liability Current And Noncurrent DeferredCompensationLiabilityCurrentAndNoncurrent	12968000	USD
CY2018Q4	us-gaap	Liabilities Fair Value Disclosure LiabilitiesFairValueDisclosure	26389000	USD
CY2019Q1	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	101211000	USD
CY2019Q2	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Earnings1 FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1	1051000	USD
CY2019Q2	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Other Comprehensive Income Loss FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss	-5000	USD
CY2019Q2	cbsh	Investment Securities Called InvestmentSecuritiesCalled	-2920000	USD
CY2019Q2	cbsh	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Discount Accretion FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetDiscountAccretion	37000	USD
CY2019Q2	cbsh	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Purchase Of Private Equity Securities FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchaseOfPrivateEquitySecurities	7829000	USD
CY2019Q2	cbsh	Sales And Repayments Of Private Equity Securities SalesAndRepaymentsOfPrivateEquitySecurities	6150000	USD
CY2019Q2	cbsh	Capitalized Interest Or Dividends CapitalizedInterestOrDividends	31000	USD
CY2019Q2	cbsh	Purchase Of Risk Participation Agreement PurchaseOfRiskParticipationAgreement	26000	USD
CY2019Q2	cbsh	Sale Of Risk Participation Agreement SaleOfRiskParticipationAgreement	73000	USD
CY2019Q2	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	98935000	USD
CY2019Q2	cbsh	Change In Unrealized Gains Or Losses Related To Assets Held Level3 Fair Value Measurements ChangeInUnrealizedGainsOrLossesRelatedToAssetsHeldLevel3FairValueMeasurements	-214000	USD
CY2018Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	100307000	USD
	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Earnings1 FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1	2578000	USD
	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Other Comprehensive Income Loss FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss	359000	USD
	cbsh	Investment Securities Called InvestmentSecuritiesCalled	-2920000	USD
	cbsh	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Discount Accretion FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetDiscountAccretion	44000	USD
	cbsh	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Purchase Of Private Equity Securities FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchaseOfPrivateEquitySecurities	9889000	USD
	cbsh	Sales And Repayments Of Private Equity Securities SalesAndRepaymentsOfPrivateEquitySecurities	6150000	USD
	cbsh	Capitalized Interest Or Dividends CapitalizedInterestOrDividends	31000	USD
	cbsh	Purchase Of Risk Participation Agreement PurchaseOfRiskParticipationAgreement	26000	USD
	cbsh	Sale Of Risk Participation Agreement SaleOfRiskParticipationAgreement	73000	USD
CY2019Q2	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	98935000	USD
	cbsh	Change In Unrealized Gains Or Losses Related To Assets Held Level3 Fair Value Measurements ChangeInUnrealizedGainsOrLossesRelatedToAssetsHeldLevel3FairValueMeasurements	-3478000	USD
CY2018Q1	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	82629000	USD
CY2018Q2	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Earnings1 FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1	-3955000	USD
CY2018Q2	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Other Comprehensive Income Loss FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss	-379000	USD
CY2018Q2	cbsh	Investment Securities Sold InvestmentSecuritiesSold	-1715000	USD
CY2018Q2	cbsh	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Discount Accretion FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetDiscountAccretion	9000	USD
CY2018Q2	cbsh	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Purchase Of Private Equity Securities FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchaseOfPrivateEquitySecurities	364000	USD
CY2018Q2	cbsh	Sales And Repayments Of Private Equity Securities SalesAndRepaymentsOfPrivateEquitySecurities	166000	USD
CY2018Q2	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	84697000	USD
CY2018Q2	cbsh	Change In Unrealized Gains Or Losses Related To Assets Held Level3 Fair Value Measurements ChangeInUnrealizedGainsOrLossesRelatedToAssetsHeldLevel3FairValueMeasurements	4538000	USD
CY2017Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	73271000	USD
	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Earnings1 FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1	-8425000	USD
	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Other Comprehensive Income Loss FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss	-246000	USD
	cbsh	Investment Securities Sold InvestmentSecuritiesSold	-1715000	USD
	cbsh	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Discount Accretion FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetDiscountAccretion	18000	USD
	cbsh	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Purchase Of Private Equity Securities FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchaseOfPrivateEquitySecurities	5243000	USD
	cbsh	Sales And Repayments Of Private Equity Securities SalesAndRepaymentsOfPrivateEquitySecurities	186000	USD
	cbsh	Capitalized Interest Or Dividends CapitalizedInterestOrDividends	35000	USD
	cbsh	Sale Of Risk Participation Agreement SaleOfRiskParticipationAgreement	148000	USD
CY2018Q2	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	84697000	USD
	cbsh	Change In Unrealized Gains Or Losses Related To Assets Held Level3 Fair Value Measurements ChangeInUnrealizedGainsOrLossesRelatedToAssetsHeldLevel3FairValueMeasurements	9006000	USD
CY2019Q2	cbsh	Total Gains Or Losses Included In Earnings Level3 Fair Measurements TotalGainsOrLossesIncludedInEarningsLevel3FairMeasurements	-1051000	USD
CY2019Q2	cbsh	Change In Unrealized Gains Or Losses Related To Assets Held Level3 Fair Value Measurements ChangeInUnrealizedGainsOrLossesRelatedToAssetsHeldLevel3FairValueMeasurements	-214000	USD
	cbsh	Total Gains Or Losses Included In Earnings Level3 Fair Measurements TotalGainsOrLossesIncludedInEarningsLevel3FairMeasurements	-2578000	USD
	cbsh	Change In Unrealized Gains Or Losses Related To Assets Held Level3 Fair Value Measurements ChangeInUnrealizedGainsOrLossesRelatedToAssetsHeldLevel3FairValueMeasurements	-3478000	USD
CY2018Q2	cbsh	Total Gains Or Losses Included In Earnings Level3 Fair Measurements TotalGainsOrLossesIncludedInEarningsLevel3FairMeasurements	3955000	USD
CY2018Q2	cbsh	Change In Unrealized Gains Or Losses Related To Assets Held Level3 Fair Value Measurements ChangeInUnrealizedGainsOrLossesRelatedToAssetsHeldLevel3FairValueMeasurements	4538000	USD
	cbsh	Total Gains Or Losses Included In Earnings Level3 Fair Measurements TotalGainsOrLossesIncludedInEarningsLevel3FairMeasurements	8425000	USD
	cbsh	Change In Unrealized Gains Or Losses Related To Assets Held Level3 Fair Value Measurements ChangeInUnrealizedGainsOrLossesRelatedToAssetsHeldLevel3FairValueMeasurements	9006000	USD
CY2019Q2	cbsh	Loans Nonrecurring Basis LoansNonrecurringBasis	135000	USD
	cbsh	Loans Nonrecurring Basis Gains Losses LoansNonrecurringBasisGainsLosses	-58000	USD
CY2019Q2	cbsh	Mortgage Servicing Rights Nonrecurring Basis MortgageServicingRightsNonrecurringBasis	6730000	USD
	cbsh	Mortgage Servicing Rights Nonrecurring Basis Gains Losses MortgageServicingRightsNonrecurringBasisGainsLosses	-309000	USD
CY2019Q2	cbsh	Long Lived Assets Nonrecurring Basis LongLivedAssetsNonrecurringBasis	820000	USD
	cbsh	Long Lived Assets Nonrecurring Basis Gains Losses LongLivedAssetsNonrecurringBasisGainsLosses	-318000	USD
CY2018Q2	cbsh	Loans Nonrecurring Basis LoansNonrecurringBasis	175000	USD
	cbsh	Loans Nonrecurring Basis Gains Losses LoansNonrecurringBasisGainsLosses	-118000	USD
CY2018Q2	cbsh	Mortgage Servicing Rights Nonrecurring Basis MortgageServicingRightsNonrecurringBasis	5463000	USD
	cbsh	Mortgage Servicing Rights Nonrecurring Basis Gains Losses MortgageServicingRightsNonrecurringBasisGainsLosses	9000	USD
CY2018Q2	cbsh	Foreclosed Assets Nonrecurring Basis ForeclosedAssetsNonrecurringBasis	47000	USD
	cbsh	Foreclosed Assets Nonrecurring Basis Gains Losses ForeclosedAssetsNonrecurringBasisGainsLosses	-47000	USD
CY2018Q2	cbsh	Long Lived Assets Nonrecurring Basis LongLivedAssetsNonrecurringBasis	914000	USD
	cbsh	Long Lived Assets Nonrecurring Basis Gains Losses LongLivedAssetsNonrecurringBasisGainsLosses	-552000	USD

Files In Submission

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$CBSH
COMMERCE BANCSHARES INC /MO/ Stock $cbsh

2019 Q3 Form 10-Q Financial Statement

#000002235619000034 Filed on August 05, 2019

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$CBSH COMMERCE BANCSHARES INC /MO/ Stock $cbsh

2019 Q3 Form 10-Q Financial Statement

#000002235619000034 Filed on August 05, 2019

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$CBSH
COMMERCE BANCSHARES INC /MO/ Stock $cbsh