$CBSH
COMMERCE BANCSHARES INC /MO/ Stock $cbsh

$cbsh Overview Financials Valuation SEC Filings Company Website

2020 Q2 Form 10-Q Financial Statement

#000002235620000031 Filed on May 11, 2020

Income Statement

Concept	2020 Q2	2020 Q1	2019 Q1
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	$10.70M	$10.60M	$10.00M
YoY Change	3.88%	6.0%	4.17%
% of Gross Profit
Operating Expenses
YoY Change
Operating Profit
YoY Change
Interest Expense	$10.27M	$20.42M	$24.38M
YoY Change	-61.66%	-16.23%	86.04%
% of Operating Profit
Other Income/Expense, Net
YoY Change
Pretax Income	$48.39M	$59.78M	$119.9M
YoY Change	-64.73%	-50.15%	-4.31%
Income Tax	$9.661M	$10.17M	$22.86M
% Of Pretax Income	19.96%	17.02%	19.06%
Net Earnings	$39.86M	$51.86M	$97.14M
YoY Change	-63.08%	-46.62%	-3.81%
Net Earnings / Revenue
Basic Earnings Per Share	$0.32	$0.42	$0.81
Diluted Earnings Per Share	$0.32	$0.42	$0.81
COMMON SHARES
Basic Shares Outstanding	111.5M shares	112.1M shares	110.9M shares
Diluted Shares Outstanding

Balance Sheet

Concept	2020 Q2	2020 Q1	2019 Q1
SHORT-TERM ASSETS
Cash & Short-Term Investments
YoY Change
Cash & Equivalents	$1.818B	$899.5M	$606.4M
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	$368.6M	$369.7M	$362.7M
YoY Change	1.38%	1.95%	9.16%
Goodwill	$138.9M	$138.9M	$138.9M
YoY Change	0.0%	0.0%	0.0%
Intangibles	$7.179M	$8.433M	$8.511M
YoY Change	-18.08%	-0.92%	7.83%
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	$30.50B	$26.79B	$25.03B
YoY Change	18.33%	7.03%	1.72%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable
YoY Change
Accrued Expenses			$28.00M
YoY Change
Deferred Revenue
YoY Change
Short-Term Debt	$1.740B	$1.428B	$1.723B
YoY Change	-27.32%	-17.12%	52.21%
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$1.740B	$1.428B	$28.00M
YoY Change	6114.29%	5000.0%	-97.53%
LONG-TERM LIABILITIES
Long-Term Debt	$1.000M	$756.0M	$2.000M
YoY Change	-80.0%	37700.0%	-77.78%
Other Long-Term Liabilities	$869.0M	$580.0M	$263.0M
YoY Change	151.88%	120.53%	16.37%
Total Long-Term Liabilities	$870.0M	$1.336B	$265.0M
YoY Change	148.57%	404.15%	12.77%
TOTAL LIABILITIES
Total Short-Term Liabilities	$1.740B	$1.428B	$28.00M
Total Long-Term Liabilities	$870.0M	$1.336B	$265.0M
Total Liabilities	$27.14B	$23.54B	$21.99B
YoY Change	20.08%	7.05%	0.39%
SHAREHOLDERS EQUITY
Retained Earnings	$232.1M	$224.6M	$307.2M
YoY Change	-39.6%	-26.87%	-5.59%
Common Stock	$564.0M	$564.0M	$559.4M
YoY Change	0.81%	0.81%	4.49%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$69.11M	$69.15M	$60.55M
YoY Change	-34.87%	14.21%	286.12%
Treasury Stock Shares	1.041M shares	1.040M shares	985.0K shares
Shareholders Equity	$3.358B	$3.251B	$3.038B
YoY Change
Total Liabilities & Shareholders Equity	$30.50B	$26.79B	$25.03B
YoY Change	18.33%	7.03%	1.72%

Cashflow Statement

Concept	2020 Q2	2020 Q1	2019 Q1
OPERATING ACTIVITIES
Net Income	$39.86M	$51.86M	$97.14M
YoY Change	-63.08%	-46.62%	-3.81%
Depreciation, Depletion And Amortization	$10.70M	$10.60M	$10.00M
YoY Change	3.88%	6.0%	4.17%
Cash From Operating Activities	$149.9M	$79.77M	$142.2M
YoY Change	36.89%	-43.9%	-1.26%
INVESTING ACTIVITIES
Capital Expenditures	-$6.100M	$7.574M	$11.28M
YoY Change	-32.22%	-32.87%	126.48%
Acquisitions
YoY Change
Other Investing Activities	-$2.652B	-$274.0M	-$20.00M
YoY Change	2362.21%	1270.0%	-106.94%
Cash From Investing Activities	-$2.658B	-$281.6M	-$31.32M
YoY Change	2177.55%	799.03%	-111.05%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net		$53.15M	$39.70M
YoY Change		33.87%	132.61%
Debt Paid & Issued, Net		$0.00	$54.00K
YoY Change		-100.0%	-27.03%
Cash From Financing Activities	3.427B	$193.5M	-$713.7M
YoY Change	846.05%	-127.12%	94.59%
NET CHANGE
Cash From Operating Activities	149.9M	$79.77M	$142.2M
Cash From Investing Activities	-2.658B	-$281.6M	-$31.32M
Cash From Financing Activities	3.427B	$193.5M	-$713.7M
Net Change In Cash	918.6M	-$8.294M	-$602.8M
YoY Change	158.76%	-98.62%	-1094.83%
FREE CASH FLOW
Cash From Operating Activities	$149.9M	$79.77M	$142.2M
Capital Expenditures	-$6.100M	$7.574M	$11.28M
Free Cash Flow	$156.0M	$72.19M	$130.9M
YoY Change	31.65%	-44.85%	-5.83%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2020Q1	dei	Entity Central Index Key EntityCentralIndexKey	0000022356
CY2020Q1	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2020Q1	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2020
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CY2020Q1	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	Q1
CY2020Q1	dei	Amendment Flag AmendmentFlag	false
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CY2019Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	8435531000	USD
CY2019Q4	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss DebtSecuritiesAvailableForSaleAllowanceForCreditLoss	0	USD
CY2020Q1	us-gaap	Mortgages Held For Sale Fair Value Disclosure MortgagesHeldForSaleFairValueDisclosure	108000	USD
CY2019Q1	cbsh	Sales And Repayments Of Private Equity Securities SalesAndRepaymentsOfPrivateEquitySecurities	0	USD
CY2019Q1	cbsh	Sale Of Risk Participation Agreement SaleOfRiskParticipationAgreement	0	USD
CY2020Q1	cbsh	Long Lived Assets Nonrecurring Basis LongLivedAssetsNonrecurringBasis	0	USD
CY2020Q1	cbsh	Long Lived Assets Nonrecurring Basis Gains Losses LongLivedAssetsNonrecurringBasisGainsLosses	0	USD
CY2020Q1	dei	Document Type DocumentType	10-Q
CY2020Q1	dei	Document Quarterly Report DocumentQuarterlyReport	true
CY2020Q1	dei	Document Period End Date DocumentPeriodEndDate	2020-03-31
CY2020Q1	dei	Document Transition Report DocumentTransitionReport	false
CY2020Q1	dei	Entity File Number EntityFileNumber	0-2989
CY2020Q1	dei	Entity Registrant Name EntityRegistrantName	COMMERCE BANCSHARES, INC.
CY2020Q1	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	MO
CY2020Q1	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	43-0889454
CY2020Q1	dei	Entity Address Address Line1 EntityAddressAddressLine1	1000 Walnut,
CY2020Q1	dei	Entity Address City Or Town EntityAddressCityOrTown	Kansas City,
CY2020Q1	dei	Entity Address State Or Province EntityAddressStateOrProvince	MO
CY2020Q1	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	64106
CY2020Q1	dei	City Area Code CityAreaCode	816
CY2020Q1	dei	Local Phone Number LocalPhoneNumber	234-2000
CY2020Q1	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2020Q1	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2020Q1	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2020Q1	dei	Entity Small Business EntitySmallBusiness	false
CY2020Q1	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2020Q1	dei	Entity Shell Company EntityShellCompany	false
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CY2019Q1	us-gaap	Occupancy Net OccupancyNet	11501000	USD
CY2020Q1	us-gaap	Equipment Expense EquipmentExpense	4821000	USD
CY2019Q1	us-gaap	Equipment Expense EquipmentExpense	4471000	USD
CY2020Q1	cbsh	Supplies Postage And Communication SuppliesPostageAndCommunication	4658000	USD
CY2019Q1	cbsh	Supplies Postage And Communication SuppliesPostageAndCommunication	5162000	USD
CY2020Q1	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	23555000	USD
CY2019Q1	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	22260000	USD
CY2020Q1	us-gaap	Marketing Expense MarketingExpense	5979000	USD
CY2019Q1	us-gaap	Marketing Expense MarketingExpense	5900000	USD
CY2020Q1	us-gaap	Other Noninterest Expense OtherNoninterestExpense	14000000	USD
CY2019Q1	us-gaap	Other Noninterest Expense OtherNoninterestExpense	20003000	USD
CY2020Q1	us-gaap	Noninterest Expense NoninterestExpense	193698000	USD
CY2019Q1	us-gaap	Noninterest Expense NoninterestExpense	191425000	USD
CY2020Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	59776000	USD
CY2019Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	119915000	USD
CY2020Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	10173000	USD
CY2019Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	22860000	USD
CY2020Q1	us-gaap	Profit Loss ProfitLoss	49603000	USD
CY2019Q1	us-gaap	Profit Loss ProfitLoss	97055000	USD
CY2020Q1	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	-2254000	USD
CY2019Q1	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	-83000	USD
CY2020Q1	us-gaap	Net Income Loss NetIncomeLoss	51857000	USD
CY2019Q1	us-gaap	Net Income Loss NetIncomeLoss	97138000	USD
CY2020Q1	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	2250000	USD
CY2019Q1	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	2250000	USD
CY2020Q1	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	49607000	USD
CY2019Q1	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	94888000	USD
CY2020Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.44
CY2019Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.81
CY2020Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.44
CY2019Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.81
CY2020Q1	us-gaap	Profit Loss ProfitLoss	49603000	USD
CY2019Q1	us-gaap	Profit Loss ProfitLoss	97055000	USD
CY2020Q1	cbsh	Net Unrealizedgainslossesonsecuritiesforwhichaportionofanotherthantemporaryimpairmenthasbeenrecordedinearnings NetUnrealizedgainslossesonsecuritiesforwhichaportionofanotherthantemporaryimpairmenthasbeenrecordedinearnings	0	USD
CY2019Q1	cbsh	Net Unrealizedgainslossesonsecuritiesforwhichaportionofanotherthantemporaryimpairmenthasbeenrecordedinearnings NetUnrealizedgainslossesonsecuritiesforwhichaportionofanotherthantemporaryimpairmenthasbeenrecordedinearnings	41000	USD
CY2020Q1	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	78672000	USD
CY2019Q1	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	73441000	USD
CY2020Q1	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-356000	USD
CY2019Q1	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-389000	USD
CY2020Q1	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	63664000	USD
CY2019Q1	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	2779000	USD
CY2020Q1	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	142692000	USD
CY2019Q1	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	76650000	USD
CY2020Q1	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	192295000	USD
CY2019Q1	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	173705000	USD
CY2020Q1	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	-2254000	USD
CY2019Q1	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	-83000	USD
CY2020Q1	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	194549000	USD
CY2019Q1	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	173788000	USD
CY2019Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	3138472000	USD
CY2020Q1	us-gaap	Profit Loss ProfitLoss	49603000	USD
CY2020Q1	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	142692000	USD
CY2020Q1	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	85000	USD
CY2020Q1	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	53145000	USD
CY2020Q1	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	-26000	USD
CY2020Q1	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	3729000	USD
CY2020Q1	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.270
CY2020Q1	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	30292000	USD
CY2020Q1	us-gaap	Preferred Stock Dividends Per Share Cash Paid PreferredStockDividendsPerShareCashPaid	0.375
CY2020Q1	us-gaap	Dividends Preferred Stock Cash DividendsPreferredStockCash	2250000	USD
CY2020Q1	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	3252464000	USD
CY2018Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	2937149000	USD
CY2019Q1	us-gaap	Profit Loss ProfitLoss	97055000	USD
CY2019Q1	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	76650000	USD
CY2019Q1	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	310000	USD
CY2019Q1	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	39699000	USD
CY2019Q1	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	-4000	USD
CY2019Q1	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	3480000	USD
CY2019Q1	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.248
CY2019Q1	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	28858000	USD
CY2019Q1	us-gaap	Preferred Stock Dividends Per Share Cash Paid PreferredStockDividendsPerShareCashPaid	0.375
CY2019Q1	us-gaap	Dividends Preferred Stock Cash DividendsPreferredStockCash	2250000	USD
CY2019Q1	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	3043213000	USD
CY2020Q1	us-gaap	Profit Loss ProfitLoss	49603000	USD
CY2019Q1	us-gaap	Profit Loss ProfitLoss	97055000	USD
CY2020Q1	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	57953000	USD
CY2019Q1	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	12463000	USD
CY2020Q1	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	10581000	USD
CY2019Q1	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	9966000	USD
CY2020Q1	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	-10362000	USD
CY2019Q1	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	-9998000	USD
CY2020Q1	us-gaap	Gain Loss On Investments GainLossOnInvestments	-13301000	USD
CY2019Q1	us-gaap	Gain Loss On Investments GainLossOnInvestments	-925000	USD
CY2020Q1	us-gaap	Gain Loss On Sale Of Loans And Leases GainLossOnSaleOfLoansAndLeases	1793000	USD
CY2019Q1	us-gaap	Gain Loss On Sale Of Loans And Leases GainLossOnSaleOfLoansAndLeases	1929000	USD
CY2020Q1	cbsh	Origination Of Loans Held For Sale OriginationOfLoansHeldForSale	33351000	USD
CY2019Q1	cbsh	Origination Of Loans Held For Sale OriginationOfLoansHeldForSale	46454000	USD
CY2020Q1	us-gaap	Proceeds From Sale Of Loans Held For Sale ProceedsFromSaleOfLoansHeldForSale	42221000	USD
CY2019Q1	us-gaap	Proceeds From Sale Of Loans Held For Sale ProceedsFromSaleOfLoansHeldForSale	48506000	USD
CY2020Q1	us-gaap	Increase Decrease In Trading Securities IncreaseDecreaseInTradingSecurities	16107000	USD
CY2019Q1	us-gaap	Increase Decrease In Trading Securities IncreaseDecreaseInTradingSecurities	-4632000	USD
CY2020Q1	us-gaap	Share Based Compensation ShareBasedCompensation	3729000	USD
CY2019Q1	us-gaap	Share Based Compensation ShareBasedCompensation	3480000	USD
CY2020Q1	us-gaap	Increase Decrease In Interest And Dividends Receivable IncreaseDecreaseInInterestAndDividendsReceivable	1681000	USD
CY2019Q1	us-gaap	Increase Decrease In Interest And Dividends Receivable IncreaseDecreaseInInterestAndDividendsReceivable	1568000	USD
CY2020Q1	us-gaap	Increase Decrease In Interest Payable Net IncreaseDecreaseInInterestPayableNet	-2161000	USD
CY2019Q1	us-gaap	Increase Decrease In Interest Payable Net IncreaseDecreaseInInterestPayableNet	2708000	USD
CY2020Q1	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	7992000	USD
CY2019Q1	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	20479000	USD
CY2020Q1	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	60881000	USD
CY2019Q1	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	18080000	USD
CY2020Q1	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	79768000	USD
CY2019Q1	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	142181000	USD
CY2020Q1	cbsh	Proceedsfromsalesandmaturitiesofavailableforsaledebtequityandothersecurities Proceedsfromsalesandmaturitiesofavailableforsaledebtequityandothersecurities	2000	USD
CY2019Q1	cbsh	Proceedsfromsalesandmaturitiesofavailableforsaledebtequityandothersecurities Proceedsfromsalesandmaturitiesofavailableforsaledebtequityandothersecurities	150756000	USD
CY2020Q1	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	641950000	USD
CY2019Q1	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	252824000	USD
CY2020Q1	us-gaap	Payments To Acquire Investments PaymentsToAcquireInvestments	569079000	USD
CY2019Q1	us-gaap	Payments To Acquire Investments PaymentsToAcquireInvestments	432645000	USD
CY2020Q1	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	346910000	USD
CY2019Q1	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	-7758000	USD
CY2020Q1	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	7574000	USD
CY2019Q1	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	11283000	USD
CY2020Q1	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	17000	USD
CY2019Q1	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	1268000	USD
CY2020Q1	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-281594000	USD
CY2019Q1	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-31322000	USD
CY2020Q1	cbsh	Net Increase Decrease Non Interest Bearing Savings Interest Checking And Money Market Deposits NetIncreaseDecreaseNonInterestBearingSavingsInterestCheckingAndMoneyMarketDeposits	181625000	USD
CY2019Q1	cbsh	Net Increase Decrease Non Interest Bearing Savings Interest Checking And Money Market Deposits NetIncreaseDecreaseNonInterestBearingSavingsInterestCheckingAndMoneyMarketDeposits	-620589000	USD
CY2020Q1	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	193532000	USD
CY2020Q1	us-gaap	Increase Decrease In Time Deposits IncreaseDecreaseInTimeDeposits	-233664000	USD
CY2019Q1	us-gaap	Increase Decrease In Time Deposits IncreaseDecreaseInTimeDeposits	218161000	USD
CY2020Q1	us-gaap	Increase Decrease In Federal Funds Purchased And Securities Sold Under Agreements To Repurchase Net IncreaseDecreaseInFederalFundsPurchasedAndSecuritiesSoldUnderAgreementsToRepurchaseNet	-422759000	USD
CY2019Q1	us-gaap	Increase Decrease In Federal Funds Purchased And Securities Sold Under Agreements To Repurchase Net IncreaseDecreaseInFederalFundsPurchasedAndSecuritiesSoldUnderAgreementsToRepurchaseNet	-233638000	USD
CY2020Q1	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	0	USD
CY2019Q1	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	54000	USD
CY2020Q1	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	754043000	USD
CY2019Q1	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-6736000	USD
CY2020Q1	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	53145000	USD
CY2019Q1	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	39699000	USD
CY2020Q1	cbsh	Paymentsforstockvalueissuedundersharebasedcompensationplans Paymentsforstockvalueissuedundersharebasedcompensationplans	26000	USD
CY2019Q1	cbsh	Paymentsforstockvalueissuedundersharebasedcompensationplans Paymentsforstockvalueissuedundersharebasedcompensationplans	4000	USD
CY2020Q1	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	30292000	USD
CY2019Q1	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	28858000	USD
CY2020Q1	us-gaap	Payments Of Dividends Preferred Stock And Preference Stock PaymentsOfDividendsPreferredStockAndPreferenceStock	2250000	USD
CY2019Q1	us-gaap	Payments Of Dividends Preferred Stock And Preference Stock PaymentsOfDividendsPreferredStockAndPreferenceStock	2250000	USD
CY2019Q1	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-713667000	USD
CY2020Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	-8294000	USD
CY2019Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	-602808000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	907808000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	1209240000	USD
CY2020Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	899514000	USD
CY2019Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	606432000	USD
CY2020Q1	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	1170000	USD
CY2019Q1	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	1350000	USD
CY2020Q1	us-gaap	Interest Paid Net InterestPaidNet	22581000	USD
CY2019Q1	us-gaap	Interest Paid Net InterestPaidNet	21668000	USD
CY2020Q1	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	57000	USD
CY2019Q1	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	54000	USD
CY2020Q1	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	23800000	USD
CY2019Q1	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	12100000	USD
CY2019Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	160682000	USD
CY2020Q1	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	139643000	USD
CY2019Q4	us-gaap	Off Balance Sheet Credit Loss Liability OffBalanceSheetCreditLossLiability	1075000	USD
CY2020Q1	us-gaap	Off Balance Sheet Credit Loss Liability OffBalanceSheetCreditLossLiability	17165000	USD
CY2019Q4	cbsh	Loans And Leases Receivable And Liability For Unfunded Lending Commitments Allowance LoansAndLeasesReceivableAndLiabilityForUnfundedLendingCommitmentsAllowance	161757000	USD
CY2020Q1	cbsh	Financing Receivable Allowance For Credit Losses And Liability For Unfunded Lending Commitments FinancingReceivableAllowanceForCreditLossesAndLiabilityForUnfundedLendingCommitments	156808000	USD
CY2020Q1	us-gaap	Loans And Leases Receivable Gross Carrying Amount LoansAndLeasesReceivableGrossCarryingAmount	15073812000	USD
CY2019Q4	us-gaap	Loans And Leases Receivable Gross Carrying Amount LoansAndLeasesReceivableGrossCarryingAmount	14737817000	USD
CY2020Q1	us-gaap	Interest Receivable InterestReceivable	38100000	USD
CY2020Q1	us-gaap	Pledged Financial Instruments Not Separately Reported Loans Receivable Pledged For Federal Home Loan Bank Debt PledgedFinancialInstrumentsNotSeparatelyReportedLoansReceivablePledgedForFederalHomeLoanBankDebt	4100000000	USD
CY2020Q1	cbsh	Pledged Financial Instruments Not Separately Reported Loans Pledged For Federal Reserve Bank Debt PledgedFinancialInstrumentsNotSeparatelyReportedLoansPledgedForFederalReserveBankDebt	1600000000	USD
CY2020Q1	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	139643000	USD
CY2020Q1	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	42868000	USD
CY2020Q1	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	14392000	USD
CY2020Q1	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	3534000	USD
CY2020Q1	us-gaap	Financing Receivable Allowance For Credit Loss Writeoff After Recovery FinancingReceivableAllowanceForCreditLossWriteoffAfterRecovery	10858000	USD
CY2020Q1	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	171653000	USD
CY2020Q1	us-gaap	Off Balance Sheet Credit Loss Liability OffBalanceSheetCreditLossLiability	17165000	USD
CY2020Q1	us-gaap	Off Balance Sheet Credit Loss Liability Credit Loss Expense Reversal OffBalanceSheetCreditLossLiabilityCreditLossExpenseReversal	15085000	USD
CY2020Q1	us-gaap	Off Balance Sheet Credit Loss Liability OffBalanceSheetCreditLossLiability	32250000	USD
CY2020Q1	cbsh	Financing Receivable Allowance For Credit Loss And Unfunded Lending Commitments Total FinancingReceivableAllowanceForCreditLossAndUnfundedLendingCommitmentsTotal	203903000	USD
CY2018Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	159932000	USD
CY2019Q1	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	12463000	USD
CY2019Q1	us-gaap	Allowance For Loan And Lease Losses Write Offs AllowanceForLoanAndLeaseLossesWriteOffs	14731000	USD
CY2019Q1	us-gaap	Allowance For Loan And Lease Loss Recovery Of Bad Debts AllowanceForLoanAndLeaseLossRecoveryOfBadDebts	3018000	USD
CY2019Q1	us-gaap	Allowance For Loan And Lease Losses Writeoffs Net AllowanceForLoanAndLeaseLossesWriteoffsNet	11713000	USD
CY2019Q1	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	160682000	USD
CY2020Q1	cbsh	Financing Receivable Recorded Investment Currentor Lessthan30days Past Due FinancingReceivableRecordedInvestmentCurrentorLessthan30daysPastDue	14959408000	USD
CY2020Q1	cbsh	Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due FinancingReceivableRecordedInvestmentThirtyToEightyNineDaysPastDue	87251000	USD
CY2020Q1	us-gaap	Financing Receivable Recorded Investment90 Days Past Due And Still Accruing FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing	16520000	USD
CY2020Q1	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	10633000	USD
CY2020Q1	us-gaap	Loans And Leases Receivable Gross Carrying Amount LoansAndLeasesReceivableGrossCarryingAmount	15073812000	USD
CY2020Q1	cbsh	Effect On Interest Income Resulting From Modification To Credit Card Loans EffectOnInterestIncomeResultingFromModificationToCreditCardLoans	1100000	USD
CY2019Q4	cbsh	Financing Receivable Recorded Investment Currentor Lessthan30days Past Due FinancingReceivableRecordedInvestmentCurrentorLessthan30daysPastDue	14627638000	USD
CY2019Q4	cbsh	Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due FinancingReceivableRecordedInvestmentThirtyToEightyNineDaysPastDue	80100000	USD
CY2019Q4	us-gaap	Financing Receivable Recorded Investment90 Days Past Due And Still Accruing FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing	19859000	USD
CY2019Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	10220000	USD
CY2019Q4	us-gaap	Loans And Leases Receivable Gross Carrying Amount LoansAndLeasesReceivableGrossCarryingAmount	14737817000	USD
CY2020Q1	cbsh	Credit Quality Personal Real Estate Loans Excluded CreditQualityPersonalRealEstateLoansExcluded	196200000	USD
CY2019Q4	cbsh	Credit Quality Personal Real Estate Loans Excluded CreditQualityPersonalRealEstateLoansExcluded	198200000	USD
CY2019Q4	cbsh	Consumer Healthcare Loans Excluded ConsumerHealthcareLoansExcluded	199200000	USD
CY2020Q1	cbsh	Credit Quality Personal Banking Loan Table Percentage Loans Excluded CreditQualityPersonalBankingLoanTablePercentageLoansExcluded	0.08	Rate
CY2020Q1	cbsh	Consumer Healthcare Loans Excluded ConsumerHealthcareLoansExcluded	198800000	USD
CY2020Q1	us-gaap	Financing Receivable Modifications Recorded Investment FinancingReceivableModificationsRecordedInvestment	87287000	USD
CY2019Q4	us-gaap	Financing Receivable Modifications Recorded Investment FinancingReceivableModificationsRecordedInvestment	79450000	USD
CY2020Q1	cbsh	Period After Which Loans Are Deemed In Default PeriodAfterWhichLoansAreDeemedInDefault	P90D
CY2020Q1	us-gaap	Financing Receivable Modifications Recorded Investment FinancingReceivableModificationsRecordedInvestment	87287000	USD
CY2020Q1	cbsh	Financing Receivable Troubled Debt Restructurings That Subsequently Defaulted Recorded Investment FinancingReceivableTroubledDebtRestructuringsThatSubsequentlyDefaultedRecordedInvestment	1347000	USD
CY2020Q1	us-gaap	Loans And Leases Receivable Impaired Commitment To Lend LoansAndLeasesReceivableImpairedCommitmentToLend	5400000	USD
CY2019Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	10220000	USD
CY2019Q4	cbsh	Accruing Restructured Loans AccruingRestructuredLoans	71512000	USD
CY2019Q4	us-gaap	Impaired Financing Receivable Recorded Investment ImpairedFinancingReceivableRecordedInvestment	81732000	USD
CY2019Q4	us-gaap	Impaired Financing Receivable Related Allowance ImpairedFinancingReceivableRelatedAllowance	2746000	USD
CY2019Q4	us-gaap	Impaired Financing Receivable Recorded Investment ImpairedFinancingReceivableRecordedInvestment	81732000	USD
CY2019Q4	cbsh	Loans And Leases Receivable Allowance Excluding Impaired Financing Receivable Related Allowance LoansAndLeasesReceivableAllowanceExcludingImpairedFinancingReceivableRelatedAllowance	157936000	USD
CY2019Q4	cbsh	Loans And Leases Receivable Excluding Impaired Financing Receivables Recorded Investment LoansAndLeasesReceivableExcludingImpairedFinancingReceivablesRecordedInvestment	14656085000	USD
CY2019Q4	us-gaap	Impaired Financing Receivable With No Related Allowance Recorded Investment ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment	7054000	USD
CY2019Q4	us-gaap	Impaired Financing Receivable With No Related Allowance Unpaid Principal Balance ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance	13738000	USD
CY2019Q4	cbsh	Impaired Financing Receivablewith No Related Allowance Allowance ImpairedFinancingReceivablewithNoRelatedAllowanceAllowance	0	USD
CY2020Q1	cbsh	Student Loans Heldfor Sale Lowerof Costor Fair Value StudentLoansHeldforSaleLowerofCostorFairValue	6100000	USD
CY2019Q4	us-gaap	Impaired Financing Receivable With Related Allowance Recorded Investment ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment	74678000	USD
CY2019Q4	us-gaap	Impaired Financing Receivable With Related Allowance Unpaid Principal Balance ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance	76652000	USD
CY2019Q4	us-gaap	Impaired Financing Receivable Related Allowance ImpairedFinancingReceivableRelatedAllowance	2746000	USD
CY2019Q4	us-gaap	Impaired Financing Receivable Recorded Investment ImpairedFinancingReceivableRecordedInvestment	81732000	USD
CY2019Q4	us-gaap	Impaired Financing Receivable Unpaid Principal Balance ImpairedFinancingReceivableUnpaidPrincipalBalance	90390000	USD
CY2019Q4	us-gaap	Impaired Financing Receivable Related Allowance ImpairedFinancingReceivableRelatedAllowance	2746000	USD
CY2019Q1	cbsh	Financing Receivable Average Recorded Investment Nonaccrual Status FinancingReceivableAverageRecordedInvestmentNonaccrualStatus	12320000	USD
CY2019Q1	cbsh	Financing Receivable Modifications Average Recorded Investment FinancingReceivableModificationsAverageRecordedInvestment	69044000	USD
CY2019Q1	us-gaap	Impaired Financing Receivable Average Recorded Investment ImpairedFinancingReceivableAverageRecordedInvestment	81364000	USD
CY2019Q1	us-gaap	Impaired Financing Receivable Interest Income Accrual Method ImpairedFinancingReceivableInterestIncomeAccrualMethod	1427000	USD
CY2020Q1	cbsh	Unpaid Principal Balanceon Personal Real Estate Loans Heldfor Sale UnpaidPrincipalBalanceonPersonalRealEstateLoansHeldforSale	108000	USD
CY2020Q1	us-gaap	Mortgages Held For Sale Fair Value Disclosure MortgagesHeldForSaleFairValueDisclosure	108000	USD
CY2020Q1	cbsh	Loans Held For Sale90 Days Past Dueand Still Accruing LoansHeldForSale90DaysPastDueandStillAccruing	0	USD
CY2020Q1	cbsh	Hfs Loansonnonaccrualstatus HFSLoansonnonaccrualstatus	0	USD
CY2020Q1	us-gaap	Real Estate Acquired Through Foreclosure RealEstateAcquiredThroughForeclosure	422000	USD
CY2019Q4	us-gaap	Real Estate Acquired Through Foreclosure RealEstateAcquiredThroughForeclosure	365000	USD
CY2020Q1	us-gaap	Other Foreclosed Assets OtherForeclosedAssets	2300000	USD
CY2019Q4	us-gaap	Other Foreclosed Assets OtherForeclosedAssets	5500000	USD
CY2020Q1	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	8678586000	USD
CY2019Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	8571626000	USD
CY2020Q1	us-gaap	Trading Securities TradingSecurities	24291000	USD
CY2019Q4	us-gaap	Trading Securities TradingSecurities	28161000	USD
CY2020Q1	us-gaap	Equity Securities Fv Ni EquitySecuritiesFvNi	2633000	USD
CY2019Q4	us-gaap	Equity Securities Fv Ni EquitySecuritiesFvNi	2929000	USD
CY2020Q1	cbsh	Equtiy Securitieswithout Readily Determinable Fair Values EqutiySecuritieswithoutReadilyDeterminableFairValues	1405000	USD
CY2019Q4	cbsh	Equtiy Securitieswithout Readily Determinable Fair Values EqutiySecuritieswithoutReadilyDeterminableFairValues	1280000	USD
CY2020Q1	us-gaap	Federal Reserve Bank Stock FederalReserveBankStock	33915000	USD
CY2019Q4	us-gaap	Federal Reserve Bank Stock FederalReserveBankStock	33770000	USD
CY2020Q1	us-gaap	Federal Home Loan Bank Stock FederalHomeLoanBankStock	40000000	USD
CY2019Q4	us-gaap	Federal Home Loan Bank Stock FederalHomeLoanBankStock	10000000	USD
CY2020Q1	cbsh	Private Equity Investments PrivateEquityInvestments	81159000	USD
CY2019Q4	cbsh	Private Equity Investments PrivateEquityInvestments	94122000	USD
CY2020Q1	cbsh	Total Investment Securities TotalInvestmentSecurities	8861989000	USD
CY2019Q4	cbsh	Total Investment Securities TotalInvestmentSecurities	8741888000	USD
CY2020Q1	us-gaap	Interest Receivable Current InterestReceivableCurrent	33700000	USD
CY2020Q1	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	8437595000	USD
CY2020Q1	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	8678586000	USD
CY2020Q1	cbsh	Percentage Decrease In Fair Value Below Amortized Cost PercentageDecreaseInFairValueBelowAmortizedCost	0.20
CY2020Q1	cbsh	Fair Value Securities On Impairment Watch List FairValueSecuritiesOnImpairmentWatchList	47200000	USD
CY2019Q4	cbsh	Fair Value Securities On Impairment Watch List FairValueSecuritiesOnImpairmentWatchList	51600000	USD
CY2020Q1	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	1122804000	USD
CY2020Q1	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	21818000	USD
CY2020Q1	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	234461000	USD
CY2020Q1	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	9539000	USD
CY2020Q1	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	1357265000	USD
CY2020Q1	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	31357000	USD
CY2019Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	1136297000	USD
CY2019Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	9413000	USD
CY2019Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	517817000	USD
CY2019Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	3451000	USD
CY2019Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	1654114000	USD
CY2019Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	12864000	USD
CY2020Q1	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue	1400000000	USD
CY2019Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue	1700000000	USD
CY2020Q1	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Accumulated Loss AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss	31400000	USD
CY2020Q1	cbsh	Af Ssecuritiesinlosspositionatperiodendchangeinunrealizedloss AFSsecuritiesinlosspositionatperiodendchangeinunrealizedloss	18500000	USD
CY2020Q1	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	8437595000	USD
CY2020Q1	cbsh	Available For Sale Securities Gross Unreailzed Gainat Period End AvailableForSaleSecuritiesGrossUnreailzedGainatPeriodEnd	272348000	USD
CY2020Q1	cbsh	Available For Sale Securities Gross Unrealized Lossat Period End AvailableForSaleSecuritiesGrossUnrealizedLossatPeriodEnd	31357000	USD
CY2020Q1	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss DebtSecuritiesAvailableForSaleAllowanceForCreditLoss	0	USD
CY2020Q1	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	8678586000	USD
CY2019Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	8435531000	USD
CY2019Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	8435531000	USD
CY2019Q4	cbsh	Available For Sale Securities Gross Unreailzed Gainat Period End AvailableForSaleSecuritiesGrossUnreailzedGainatPeriodEnd	148959000	USD
CY2019Q4	cbsh	Available For Sale Securities Gross Unrealized Lossat Period End AvailableForSaleSecuritiesGrossUnrealizedLossatPeriodEnd	12864000	USD
CY2019Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	8571626000	USD
CY2020Q1	us-gaap	Proceeds From Sale Of Available For Sale Securities ProceedsFromSaleOfAvailableForSaleSecurities	0	USD
CY2019Q1	us-gaap	Proceeds From Sale Of Available For Sale Securities ProceedsFromSaleOfAvailableForSaleSecurities	150756000	USD
CY2020Q1	cbsh	Proceedsfromsaleofequitysecurities Proceedsfromsaleofequitysecurities	2000	USD
CY2019Q1	cbsh	Proceedsfromsaleofequitysecurities Proceedsfromsaleofequitysecurities	0	USD
CY2020Q1	cbsh	Proceedsfromsalesandmaturitiesofavailableforsaledebtequityandothersecurities Proceedsfromsalesandmaturitiesofavailableforsaledebtequityandothersecurities	2000	USD
CY2019Q1	cbsh	Proceedsfromsalesandmaturitiesofavailableforsaledebtequityandothersecurities Proceedsfromsalesandmaturitiesofavailableforsaledebtequityandothersecurities	150756000	USD
CY2020Q1	us-gaap	Gain Loss On Investments GainLossOnInvestments	-13301000	USD
CY2019Q1	us-gaap	Gain Loss On Investments GainLossOnInvestments	-925000	USD
CY2020Q1	cbsh	Investment Securities Pledged At Fair Value InvestmentSecuritiesPledgedAtFairValue	3900000000	USD
CY2020Q1	us-gaap	Financial Instruments Owned And Pledged As Collateral Amount Eligible To Be Repledged By Counterparty FinancialInstrumentsOwnedAndPledgedAsCollateralAmountEligibleToBeRepledgedByCounterparty	209300000	USD
CY2020Q1	cbsh	Investments Exceeding Ten Percent Of Stockholders Equity InvestmentsExceedingTenPercentOfStockholdersEquity	0
CY2020Q1	cbsh	Percentage Of Stockholders Equity Of Which No Investment From Single Issuer Exceeds PercentageOfStockholdersEquityOfWhichNoInvestmentFromSingleIssuerExceeds	0.10
CY2020Q1	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	44435000	USD
CY2020Q1	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	34619000	USD
CY2020Q1	us-gaap	Valuation Allowances And Reserves Balance ValuationAllowancesAndReservesBalance	1383000	USD
CY2020Q1	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	8433000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	44212000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	34351000	USD
CY2019Q4	us-gaap	Valuation Allowances And Reserves Balance ValuationAllowancesAndReservesBalance	327000	USD
CY2019Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	9534000	USD
CY2020Q1	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	268000	USD
CY2019Q1	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	342000	USD
CY2020Q1	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	1616000	USD
CY2020Q1	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	1283000	USD
CY2020Q1	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	1053000	USD
CY2020Q1	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	868000	USD
CY2020Q1	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	706000	USD
CY2019Q4	us-gaap	Goodwill Goodwill	138921000	USD
CY2020Q1	us-gaap	Goodwill Goodwill	138921000	USD
CY2020Q1	us-gaap	Sales Type And Direct Financing Leases Profit Loss SalesTypeAndDirectFinancingLeasesProfitLoss	6358000	USD
CY2019Q1	us-gaap	Sales Type And Direct Financing Leases Profit Loss SalesTypeAndDirectFinancingLeasesProfitLoss	5862000	USD
CY2020Q1	us-gaap	Operating Lease Lease Income OperatingLeaseLeaseIncome	2061000	USD
CY2019Q1	us-gaap	Operating Lease Lease Income OperatingLeaseLeaseIncome	1906000	USD
CY2020Q1	us-gaap	Lease Income LeaseIncome	8419000	USD
CY2019Q1	us-gaap	Lease Income LeaseIncome	7768000	USD
CY2020Q1	us-gaap	Defined Benefit Plan Service Cost DefinedBenefitPlanServiceCost	101000	USD
CY2019Q1	us-gaap	Defined Benefit Plan Service Cost DefinedBenefitPlanServiceCost	159000	USD
CY2020Q1	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	822000	USD
CY2019Q1	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	1065000	USD
CY2020Q1	us-gaap	Defined Benefit Plan Expected Return On Plan Assets DefinedBenefitPlanExpectedReturnOnPlanAssets	1297000	USD
CY2019Q1	us-gaap	Defined Benefit Plan Expected Return On Plan Assets DefinedBenefitPlanExpectedReturnOnPlanAssets	1196000	USD
CY2020Q1	us-gaap	Defined Benefit Plan Amortization Of Prior Service Cost Credit DefinedBenefitPlanAmortizationOfPriorServiceCostCredit	-68000	USD
CY2019Q1	us-gaap	Defined Benefit Plan Amortization Of Prior Service Cost Credit DefinedBenefitPlanAmortizationOfPriorServiceCostCredit	-68000	USD
CY2020Q1	us-gaap	Defined Benefit Plan Amortization Of Gains Losses DefinedBenefitPlanAmortizationOfGainsLosses	-542000	USD
CY2019Q1	us-gaap	Defined Benefit Plan Amortization Of Gains Losses DefinedBenefitPlanAmortizationOfGainsLosses	-586000	USD
CY2020Q1	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	100000	USD
CY2019Q1	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	546000	USD
CY2020Q1	us-gaap	Defined Benefit Plan Contributions By Employer DefinedBenefitPlanContributionsByEmployer	0	USD
CY2020Q1	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	229000	shares
CY2019Q1	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	296000	shares
CY2019Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	110444000	USD
CY2020Q1	us-gaap	Other Comprehensive Income Loss Before Reclassifications Before Tax OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax	189559000	USD
CY2020Q1	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Before Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax	-696000	USD
CY2020Q1	us-gaap	Other Comprehensive Income Loss Before Tax OtherComprehensiveIncomeLossBeforeTax	190255000	USD
CY2020Q1	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	47563000	USD
CY2020Q1	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	142692000	USD
CY2020Q1	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	253136000	USD
CY2018Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-64669000	USD
CY2019Q1	us-gaap	Other Comprehensive Income Loss Before Reclassifications Before Tax OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax	101696000	USD
CY2019Q1	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Before Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax	-502000	USD
CY2019Q1	us-gaap	Other Comprehensive Income Loss Before Tax OtherComprehensiveIncomeLossBeforeTax	102198000	USD
CY2019Q1	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	25548000	USD
CY2019Q1	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	76650000	USD
CY2019Q1	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	11981000	USD
CY2020Q1	us-gaap	Number Of Operating Segments NumberOfOperatingSegments	3
CY2020Q1	cbsh	Number Of Locations NumberOfLocations	160	Locations
CY2020Q1	us-gaap	Revenues Revenues	0	USD
CY2019Q1	us-gaap	Revenues Revenues	0	USD
CY2020Q1	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	201065000	USD
CY2020Q1	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	57953000	USD
CY2020Q1	us-gaap	Noninterest Income NoninterestIncome	123663000	USD
CY2020Q1	us-gaap	Gain Loss On Investments GainLossOnInvestments	-13301000	USD
CY2020Q1	us-gaap	Noninterest Expense NoninterestExpense	193698000	USD
CY2020Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	59776000	USD
CY2019Q1	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	203488000	USD
CY2019Q1	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	12463000	USD
CY2019Q1	us-gaap	Noninterest Income NoninterestIncome	121240000	USD
CY2019Q1	us-gaap	Gain Loss On Investments GainLossOnInvestments	-925000	USD
CY2019Q1	us-gaap	Noninterest Expense NoninterestExpense	191425000	USD
CY2019Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	119915000	USD
CY2020Q1	us-gaap	Derivative Notional Amount DerivativeNotionalAmount	4578638000	USD
CY2019Q4	us-gaap	Derivative Notional Amount DerivativeNotionalAmount	4525856000	USD
CY2020Q1	us-gaap	Derivative Assets DerivativeAssets	250450000	USD
CY2019Q4	us-gaap	Derivative Assets DerivativeAssets	105674000	USD
CY2020Q1	us-gaap	Derivative Liabilities DerivativeLiabilities	20443000	USD
CY2019Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	10219000	USD
CY2020Q1	us-gaap	Derivative Asset Fair Value Gross Asset Including Not Subject To Master Netting Arrangement DerivativeAssetFairValueGrossAssetIncludingNotSubjectToMasterNettingArrangement	250450000	USD
CY2020Q1	cbsh	Derivative Asset Amount Offset By Liabiilty DerivativeAssetAmountOffsetByLiabiilty	0	USD
CY2020Q1	us-gaap	Derivative Assets DerivativeAssets	250450000	USD
CY2020Q1	us-gaap	Derivative Liability Fair Value Gross Liability Including Not Subject To Master Netting Arrangement DerivativeLiabilityFairValueGrossLiabilityIncludingNotSubjectToMasterNettingArrangement	20443000	USD
CY2020Q1	cbsh	Derivative Liability Amount Offset By Asset DerivativeLiabilityAmountOffsetByAsset	0	USD
CY2020Q1	us-gaap	Derivative Liabilities DerivativeLiabilities	20443000	USD
CY2019Q4	us-gaap	Derivative Asset Fair Value Gross Asset Including Not Subject To Master Netting Arrangement DerivativeAssetFairValueGrossAssetIncludingNotSubjectToMasterNettingArrangement	105674000	USD
CY2019Q4	cbsh	Derivative Asset Amount Offset By Liabiilty DerivativeAssetAmountOffsetByLiabiilty	0	USD
CY2019Q4	us-gaap	Derivative Assets DerivativeAssets	105674000	USD
CY2019Q4	us-gaap	Derivative Liability Fair Value Gross Liability Including Not Subject To Master Netting Arrangement DerivativeLiabilityFairValueGrossLiabilityIncludingNotSubjectToMasterNettingArrangement	10219000	USD
CY2019Q4	cbsh	Derivative Liability Amount Offset By Asset DerivativeLiabilityAmountOffsetByAsset	0	USD
CY2019Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	10219000	USD
CY2020Q1	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	3700000	USD
CY2019Q1	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	3500000	USD
CY2019Q4	cbsh	Nonvested Share Awards Balances NonvestedShareAwardsBalances	1104211	shares
CY2019Q4	cbsh	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Nonvested Share Awards Weighted Average Grant Date Unit Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsNonvestedShareAwardsWeightedAverageGrantDateUnitFairValue	47.57
CY2020Q1	cbsh	Nonvested Share Awards Granted In Period NonvestedShareAwardsGrantedInPeriod	210485	shares
CY2020Q1	cbsh	Share Based Compensation Granted Nonvested Share Award Weighted Average Grant Date Fair Value ShareBasedCompensationGrantedNonvestedShareAwardWeightedAverageGrantDateFairValue	64.41
CY2020Q1	cbsh	Nonvested Share Awards Vested In Period NonvestedShareAwardsVestedInPeriod	246477	shares
CY2020Q1	cbsh	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Nonvested Share Awards Vested In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsNonvestedShareAwardsVestedInPeriodWeightedAverageGrantDateFairValue	33.49
CY2020Q1	cbsh	Nonvested Share Awards Forfeited In Period NonvestedShareAwardsForfeitedInPeriod	1619	shares
CY2020Q1	cbsh	Share Based Compensation Forfeited Nonvested Share Award Weighted Average Grant Date Fair Value ShareBasedCompensationForfeitedNonvestedShareAwardWeightedAverageGrantDateFairValue	48.83
CY2020Q1	cbsh	Nonvested Share Awards Balances NonvestedShareAwardsBalances	1066600	shares
CY2020Q1	cbsh	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Nonvested Share Awards Weighted Average Grant Date Unit Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsNonvestedShareAwardsWeightedAverageGrantDateUnitFairValue	54.15
CY2020Q1	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	10.12
CY2020Q1	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate	0.017
CY2020Q1	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate	0.202
CY2020Q1	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate	0.010
CY2020Q1	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Fair Value Assumptions Expected Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1	P5Y9M18D
CY2019Q4	cbsh	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Number ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNumber	1049816	shares
CY2019Q4	cbsh	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsWeightedAverageExercisePrice	43.55
CY2020Q1	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod	103210	shares
CY2020Q1	cbsh	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageExercisePrice	63.18
CY2020Q1	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeited In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod	501	shares
CY2020Q1	cbsh	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeited In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriodWeightedAverageExercisePrice	53.29
CY2020Q1	cbsh	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Expired In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpiredInPeriod	78	shares
CY2020Q1	cbsh	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Expired In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpiredInPeriodWeightedAverageExercisePrice	54.33
CY2020Q1	cbsh	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Exercised In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisedInPeriod	129879	shares
CY2020Q1	cbsh	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Exercised In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisedInPeriodWeightedAverageExercisePrice	33.65
CY2020Q1	cbsh	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Number ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNumber	1022568	shares
CY2020Q1	cbsh	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsWeightedAverageExercisePrice	46.79
CY2020Q1	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Outstanding Weighted Average Remaining Contractual Terms ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageRemainingContractualTerms	P6Y10M24D
CY2020Q1	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Equity Instruments Other Than Options Aggregate Intrinsic Value Outstanding SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueOutstanding	7089000	USD
CY2020Q1	cbsh	Percentof Revenuenotinscopeof Asc606 PercentofRevenuenotinscopeofASC606	0.62	Rate
CY2020Q1	us-gaap	Noninterest Income NoninterestIncome	123663000	USD
CY2019Q1	us-gaap	Noninterest Income NoninterestIncome	121240000	USD
CY2020Q1	us-gaap	Mortgages Held For Sale Fair Value Disclosure MortgagesHeldForSaleFairValueDisclosure	108000	USD
CY2020Q1	us-gaap	Financial Instruments Owned Us Government And Agency Obligations At Fair Value FinancialInstrumentsOwnedUSGovernmentAndAgencyObligationsAtFairValue	840447000	USD
CY2020Q1	cbsh	Us Government Sponsored Enterprises Debt Securities USGovernmentSponsoredEnterprisesDebtSecurities	112870000	USD
CY2020Q1	us-gaap	Financial Instruments Owned State And Municipal Government Obligations At Fair Value FinancialInstrumentsOwnedStateAndMunicipalGovernmentObligationsAtFairValue	1283068000	USD
CY2020Q1	cbsh	Financial Instruments Owned Agency Mortgage Backed Securities At Fair Value FinancialInstrumentsOwnedAgencyMortgageBackedSecuritiesAtFairValue	4168421000	USD
CY2020Q1	cbsh	Financial Instruments Owned Non Agency Mortgage Backed Securities At Fair Value FinancialInstrumentsOwnedNonAgencyMortgageBackedSecuritiesAtFairValue	717008000	USD
CY2020Q1	cbsh	Other Asset Backed Securities Disclosure OtherAssetBackedSecuritiesDisclosure	1232292000	USD
CY2020Q1	cbsh	Financial Instruments Owned Other Debt Securities At Fair Value FinancialInstrumentsOwnedOtherDebtSecuritiesAtFairValue	324480000	USD
CY2020Q1	us-gaap	Trading Securities TradingSecurities	24291000	USD
CY2020Q1	us-gaap	Equity Securities Fv Ni EquitySecuritiesFvNi	2633000	USD
CY2020Q1	us-gaap	Financial Instruments Owned Principal Investments At Fair Value FinancialInstrumentsOwnedPrincipalInvestmentsAtFairValue	81159000	USD
CY2020Q1	us-gaap	Derivative Assets DerivativeAssets	250450000	USD
CY2020Q1	us-gaap	Deferred Compensation Plan Assets DeferredCompensationPlanAssets	14194000	USD
CY2020Q1	us-gaap	Assets Fair Value Disclosure AssetsFairValueDisclosure	9051421000	USD
CY2020Q1	us-gaap	Derivative Liabilities DerivativeLiabilities	20443000	USD
CY2020Q1	us-gaap	Deferred Compensation Liability Current And Noncurrent DeferredCompensationLiabilityCurrentAndNoncurrent	14194000	USD
CY2020Q1	us-gaap	Liabilities Fair Value Disclosure LiabilitiesFairValueDisclosure	34637000	USD
CY2019Q4	us-gaap	Mortgages Held For Sale Fair Value Disclosure MortgagesHeldForSaleFairValueDisclosure	9181000	USD
CY2019Q4	us-gaap	Financial Instruments Owned Us Government And Agency Obligations At Fair Value FinancialInstrumentsOwnedUSGovernmentAndAgencyObligationsAtFairValue	851776000	USD
CY2019Q4	cbsh	Us Government Sponsored Enterprises Debt Securities USGovernmentSponsoredEnterprisesDebtSecurities	139277000	USD
CY2019Q4	us-gaap	Financial Instruments Owned State And Municipal Government Obligations At Fair Value FinancialInstrumentsOwnedStateAndMunicipalGovernmentObligationsAtFairValue	1267927000	USD
CY2019Q4	cbsh	Financial Instruments Owned Agency Mortgage Backed Securities At Fair Value FinancialInstrumentsOwnedAgencyMortgageBackedSecuritiesAtFairValue	3937964000	USD
CY2019Q4	cbsh	Financial Instruments Owned Non Agency Mortgage Backed Securities At Fair Value FinancialInstrumentsOwnedNonAgencyMortgageBackedSecuritiesAtFairValue	809782000	USD
CY2019Q4	cbsh	Other Asset Backed Securities Disclosure OtherAssetBackedSecuritiesDisclosure	1233489000	USD
CY2019Q4	cbsh	Financial Instruments Owned Other Debt Securities At Fair Value FinancialInstrumentsOwnedOtherDebtSecuritiesAtFairValue	331411000	USD
CY2019Q4	us-gaap	Trading Securities TradingSecurities	28161000	USD
CY2019Q4	us-gaap	Equity Securities Fv Ni EquitySecuritiesFvNi	2929000	USD
CY2019Q4	us-gaap	Financial Instruments Owned Principal Investments At Fair Value FinancialInstrumentsOwnedPrincipalInvestmentsAtFairValue	94122000	USD
CY2019Q4	us-gaap	Derivative Assets DerivativeAssets	105674000	USD
CY2019Q4	us-gaap	Deferred Compensation Plan Assets DeferredCompensationPlanAssets	16518000	USD
CY2019Q4	us-gaap	Assets Fair Value Disclosure AssetsFairValueDisclosure	8828211000	USD
CY2019Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	10219000	USD
CY2019Q4	us-gaap	Deferred Compensation Liability Current And Noncurrent DeferredCompensationLiabilityCurrentAndNoncurrent	16518000	USD
CY2019Q4	us-gaap	Liabilities Fair Value Disclosure LiabilitiesFairValueDisclosure	26737000	USD
CY2019Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	104344000	USD
CY2020Q1	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Earnings1 FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1	13494000	USD
CY2020Q1	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Other Comprehensive Income Loss FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss	-1495000	USD
CY2020Q1	cbsh	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Discount Accretion FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetDiscountAccretion	4000	USD
CY2020Q1	cbsh	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Purchase Of Private Equity Securities FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchaseOfPrivateEquitySecurities	114000	USD
CY2020Q1	cbsh	Sales And Repayments Of Private Equity Securities SalesAndRepaymentsOfPrivateEquitySecurities	69000	USD
CY2020Q1	cbsh	Sale Of Risk Participation Agreement SaleOfRiskParticipationAgreement	440000	USD
CY2020Q1	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	88964000	USD
CY2020Q1	cbsh	Change In Unrealized Gains Or Losses Related To Assets Held Level3 Fair Value Measurements ChangeInUnrealizedGainsOrLossesRelatedToAssetsHeldLevel3FairValueMeasurements	-13063000	USD
CY2020Q1	cbsh	Gains Losses Included In Oci Attributable To Change In Unrealized Gains Losses Relating To Assets Still Held Total GainsLossesIncludedInOCIAttributableToChangeInUnrealizedGainsLossesRelatingToAssetsStillHeldTotal	-1495000	USD
CY2018Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	100307000	USD
CY2019Q1	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Earnings1 FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1	1527000	USD
CY2019Q1	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Other Comprehensive Income Loss FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss	364000	USD
CY2019Q1	cbsh	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Discount Accretion FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetDiscountAccretion	7000	USD
CY2019Q1	cbsh	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Purchase Of Private Equity Securities FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchaseOfPrivateEquitySecurities	2060000	USD
CY2019Q1	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	101211000	USD
CY2019Q1	cbsh	Change In Unrealized Gains Or Losses Related To Assets Held Level3 Fair Value Measurements ChangeInUnrealizedGainsOrLossesRelatedToAssetsHeldLevel3FairValueMeasurements	-991000	USD
CY2020Q1	cbsh	Total Gains Or Losses Included In Earnings Level3 Fair Measurements TotalGainsOrLossesIncludedInEarningsLevel3FairMeasurements	-13494000	USD
CY2020Q1	cbsh	Change In Unrealized Gains Or Losses Related To Assets Held Level3 Fair Value Measurements ChangeInUnrealizedGainsOrLossesRelatedToAssetsHeldLevel3FairValueMeasurements	-13063000	USD
CY2019Q1	cbsh	Total Gains Or Losses Included In Earnings Level3 Fair Measurements TotalGainsOrLossesIncludedInEarningsLevel3FairMeasurements	-1527000	USD
CY2019Q1	cbsh	Change In Unrealized Gains Or Losses Related To Assets Held Level3 Fair Value Measurements ChangeInUnrealizedGainsOrLossesRelatedToAssetsHeldLevel3FairValueMeasurements	-991000	USD
CY2020Q1	cbsh	Loans Nonrecurring Basis LoansNonrecurringBasis	124000	USD
CY2020Q1	cbsh	Loans Nonrecurring Basis Gains Losses LoansNonrecurringBasisGainsLosses	-16000	USD
CY2020Q1	cbsh	Mortgage Servicing Rights Nonrecurring Basis MortgageServicingRightsNonrecurringBasis	6768000	USD
CY2020Q1	cbsh	Mortgage Servicing Rights Nonrecurring Basis Gains Losses MortgageServicingRightsNonrecurringBasisGainsLosses	-1056000	USD
CY2019Q1	cbsh	Loans Nonrecurring Basis LoansNonrecurringBasis	129000	USD
CY2019Q1	cbsh	Loans Nonrecurring Basis Gains Losses LoansNonrecurringBasisGainsLosses	-170000	USD
CY2019Q1	cbsh	Mortgage Servicing Rights Nonrecurring Basis MortgageServicingRightsNonrecurringBasis	6341000	USD
CY2019Q1	cbsh	Mortgage Servicing Rights Nonrecurring Basis Gains Losses MortgageServicingRightsNonrecurringBasisGainsLosses	-260000	USD
CY2019Q1	cbsh	Long Lived Assets Nonrecurring Basis LongLivedAssetsNonrecurringBasis	134000	USD
CY2019Q1	cbsh	Long Lived Assets Nonrecurring Basis Gains Losses LongLivedAssetsNonrecurringBasisGainsLosses	-14000	USD
CY2020Q1	cbsh	Mortgage Servicing Rights Nonrecurring Basis MortgageServicingRightsNonrecurringBasis	6800000	USD
CY2020Q1	cbsh	Fair Value Discounted Cash Flow Valuation Techniques FairValueDiscountedCashFlowValuationTechniques	Discounted cash flow

Files In Submission

Name	View Source	Status
0000022356-20-000031-index-headers.html	Edgar Link	pending
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0000022356-20-000031.txt	Edgar Link	pending
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$CBSH
COMMERCE BANCSHARES INC /MO/ Stock $cbsh

2020 Q2 Form 10-Q Financial Statement

#000002235620000031 Filed on May 11, 2020

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$CBSH COMMERCE BANCSHARES INC /MO/ Stock $cbsh

2020 Q2 Form 10-Q Financial Statement

#000002235620000031 Filed on May 11, 2020

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$CBSH
COMMERCE BANCSHARES INC /MO/ Stock $cbsh