75000 - Document - Document and Entity Information link:presentationLink link:calculationLink link:definitionLink 75010 - Statement - STATEMENT OF NET ASSETS AVAILABLE FOR BENEFITs link:presentationLink link:calculationLink link:definitionLink 75020 - Statement - STATEMENT OF CHANGES IN NET ASSETS AVAILABLE FOR BENEFITS link:presentationLink link:calculationLink link:definitionLink 75030 - Disclosure - Summary of Significant Accounting Policies link:presentationLink link:calculationLink link:definitionLink 75040 - Disclosure - Description of the Plan link:presentationLink link:calculationLink link:definitionLink 75050 - Disclosure - UMB Retirement Master Trust link:presentationLink link:calculationLink link:definitionLink 75060 - Disclosure - Fair Value Measurements link:presentationLink link:calculationLink link:definitionLink 75070 - Disclosure - Plan Termination link:presentationLink link:calculationLink link:definitionLink 75080 - Disclosure - Tax Status link:presentationLink link:calculationLink link:definitionLink 75090 - Disclosure - Related Party and Party In Interest Transactions link:presentationLink link:calculationLink link:definitionLink 75100 - Disclosure - Transfers from The ESOP of UMB link:presentationLink link:calculationLink link:definitionLink 75110 - Disclosure - Subsequent Event link:presentationLink link:calculationLink link:definitionLink 75120 - Disclosure - Schedule of Assets (Held at End of Year) link:presentationLink link:calculationLink link:definitionLink 75130 - Disclosure - Summary of Significant Accounting Policies (Policies) link:presentationLink link:calculationLink link:definitionLink 75140 - Disclosure - UMB Retirement Master Trust (Tables) link:presentationLink link:calculationLink link:definitionLink 75150 - Disclosure - Fair Value Measurements (Tables) link:presentationLink link:calculationLink link:definitionLink 75160 - Disclosure - Description of the Plan - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 75170 - Disclosure - Summary of Significant Accounting Policies - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 75180 - Disclosure - UMB Retirement Master Trust - Schedule of Master Trust and Plan's Interest in Net Assets of Master Trust (Details) link:presentationLink link:calculationLink link:definitionLink 75190 - Disclosure - UMB Retirement Master Trust - Schedule of Net Investment Income from Master Trust (Details) link:presentationLink link:calculationLink link:definitionLink 75200 - Disclosure - Fair Value Measurements - Summary of Plan's Assets Measured at Fair Value on a Recurring Basis (Details) link:presentationLink link:calculationLink link:definitionLink 75210 - Disclosure - Plan Termination - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 75220 - Disclosure - Tax Status - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 75230 - Disclosure - Related Party and Party In Interest Transactions - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 75240 - Disclosure - Transfers from The ESOP of UMB - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 75250 - Disclosure - Subsequent Event - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 75260 - Disclosure - Schedule of Assets (Held at End of Year) (Details) link:presentationLink link:calculationLink link:definitionLink 75260 - Disclosure - Schedule of Assets (Held at End of Year) (Details) [Default] link:presentationLink link:calculationLink link:definitionLink EBP, Note Receivable from Participant, Account, Maximum Borrowing, to Total Account, Percentage Maximum, participants may borrow from their accounts Percentage of vested balance EBP, Forfeited Nonvested Account, Decrease from Employer Contribution Forfeited nonvested amounts used to reduce Company contributions EBP, Master Trust [Abstract] EBP, Change in Net Asset Available for Benefit, Decrease from Administrative Expense Administrative expenses Administrative fees EBP, Net Asset Available for Benefit Net assets available for benefits - end of year Net assets available for benefits - beginning of year Net assets available for benefits Net assets Minimum Minimum [Member] EBP, Employer Contribution, Matching Percentage Company matching contribution EBP, Schedule of Asset Held for Investment [Table] EBP, Tax Status [Line Items] EBP, Payment to Participant [Policy Text Block] Payment of Benefits EBP, Risk and Uncertainty [Policy Text Block] Risks and Uncertainties EBP, Description of Plan and Accounting Change [Abstract] Subsequent Event Type [Domain] Employee Benefit Plan, Vested Account Balance Employee benefit plan, vested account balance. Vested account balance Document Period End Date Document Information [Table] EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value Employee Benefit Plan Recognition of Investment Income [Policy Text Block] Employee benefit plan recognition of investment income policy. Recognition of Investment Income EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] Investments [Domain] EBP, Statement of Net Asset Available for Benefit [Abstract] EBP, Employer Contribution, Receivable Employer contributions Amount included in employer contributions receivable EBP, Form 5500 Caption, Total Contributions Total profit sharing contributions Total investments Common stock fair value Investments, at fair value EBP, Investment, Fair Value Notes receivable from participants EBP, Note Receivable from Participant Plan's share of net assets of the master trust Employee Benefit Plan Investment Plan Interest in Master Trust, Shares Employee benefit plan, investment plan interest in master trust shares. EBP, Tax Status [Text Block] Tax Status Employee Benefit Plan, Defined Contribution Plan, Minimum Service Period for Eligibility Employee benefit plan, defined contribution plan, minimum service period for eligibility. Employee benefit plan, defined contribution plan, minimum service period for eligibility Employee Benefit Plan, Years of Service Employee benefit plan, years of service. Years of service Transfers from The ESOP of UMB, Disclosure, [Text Block] Transfers from the ESOP of UMB, disclosure, text block. Transfers from The ESOP of UMB UMB Retirement Master Trust EBP, Master Trust [Text Block] Employee Benefit Plan, Vested Percentage, after Two Years of Service Employee benefit plan, vested percentage, after two years of service. Vested percentage after two years of service Investment income: EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Income (Loss) on Investment [Abstract] EBP, Accounting Policy [Table] Deferred vested account balance Employee Benefit Plan, Deferred Vested Account Balance Employee benefit plan, deferred vested account balance. EBP, Investment [Policy Text Block] Valuation of Investments Common Collective Trust [Member] Collective Investment Trust EBP, Change in Net Asset Available for Benefit, Increase from Interest Income on Note Receivable from Participant Interest income on notes receivable from participants Statistical Measurement [Axis] Money Market Funds [Member] Money Market Fund Participant's contributions, percentage EBP, Employer Contribution, Participant Compensation Matched, Percentage EBP, Participant Contribution, Receivable Employee contributions EBP, Investment Income, Receivable Dividends receivable Basis of Accounting and Use of Estimates EBP, Basis of Accounting [Policy Text Block] Fair Value, Inputs, Level 3 [Member] Level 3 Employee Benefit Plan Participants Vested Percentage Employee benefit plan participants vested percentage. Participants vested percentage EBP, Investment, Fair Value and NAV [Table Text Block] Summary of Plan's Assets Measured at Fair Value on a Recurring Basis Entity Information [Line Items] Transfers from The ESOP of UMB [Table] Transfers from the ESOP of UMB table. Fair Value Hierarchy and NAV [Axis] EBP, Change in Net Asset Available for Benefit, Decrease [Abstract] Deductions from net assets attributed to: EBP, Nonconsolidated, Plan Interest in Master Trust [Member] Plan's Interest in Master Trust EBP, Description of Plan [Line Items] EBP, Other Receivable Other Employee Benefit Plan Net Investment Income From Master Trust [Table Text Block] Employee benefit plan net investment income from master trust. Schedule of Net Investment Income from Master Trust Total contributions EBP, Change in Net Asset Available for Benefit, Increase from Contribution Employee Benefit Plan, Benefits, Description Employee benefit plan, benefits, description. Benefits Document Fiscal Period Focus Employee Benefit Plan Change In Net Asset Available For Benefit Other Transfer Employee benefit plan change in net asset available for benefit other transfer. Other transfers EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Change in Plan Interest in Master Trust Plan interest in UMB Retirement Master Trust investment income EBP, Participant Contribution, Automatic, Deferral Rate Percentage of compensation withheld from new employee's paycheck each payroll period EBP, Employer, Common Stock [Member] UMB Company Stock EBP, Schedule of Asset Held for Investment [Abstract] Total deductions EBP, Change in Net Asset Available for Benefit, Decrease EBP, Related Party and Party-in-Interest Transactions [Abstract] EBP, Investment, Issuer Name [Extensible Enumeration] EBP, Note Receivable from Participant, Account, Maximum Borrowing, Amount Maximum, participants may borrow from their accounts Fair Value, Inputs, Level 1 [Member] Level 1 Investment Type [Axis] Employee benefit plan employer contribution receivable excluding of profit sharing contributions Employee benefit plan employer contribution receivable excluding of profit sharing contributions. Amount included in employer contributions receivable Employee Benefit Plan, Vested Percentage, after Three Years of Service Employee benefit plan, vested percentage, after three years of service. Vested percentage after three years of service EBP, Investment, Current Value, Type [Extensible Enumeration] Company contributed amount Employee Benefit Plan, Employer Contribution, Amount Employee benefit plan, employer contribution, amount. EBP, Asset Held for Investment, Participant Loan, Maturity Date Statistical Measurement [Domain] Contributions, description Employee Benefit Plan, Contribution, Description Employee benefit plan, contribution, description. Entity Central Index Key EBP, Asset Held for Investment, Participant Loan, Interest Rate EBP, Summary of Accounting Policy [Text Block] Summary of Significant Accounting Policies EBP, Plan Termination [Text Block] Plan Termination Fair Value, Inputs, Level 2 [Member] Level 2 EBP, Note Receivable from Participant, Allowance for Credit Loss Allowance for current expected credit losses Fair Value, Inputs, Level 1, Level 2, and Level 3 Fair Value, Inputs, Level 1, Level 2, and Level 3 [Member] EBP, Nonconsolidated, Master Trust [Member] Master Trust EBP, Statement of Net Asset Available for Benefit [Table] EBP, Accounting Policy [Line Items] EBP, Investment, Fair Value and NAV [Abstract] EBP 001 [Member] EBP 001. EBP 001 Participants vested percentage Participants vested percentage. Fair Value Hierarchy and NAV [Domain] EBP, Form 5500 Caption, Contributions, Employers Company made total profit sharing contributions EBP, Change in Net Asset Available for Benefit, Increase from Interest and Dividend Income on Investment EBP, Change in Net Asset Available for Benefit, Increase from Interest and Dividend Income on Investment, Total Dividend and interest income EBP, Nonconsolidated, Master Trust and Plan Interest in Master Trust [Axis] Balance Rolled over to IRA Account with Fidelity Investments [Member] Balance rolled over to IRA account with Fidelity Investments, member. Balance Rolled Over to IRA Account with Fidelity Investments Prime rate plus interest rate Employee Benefit Plan, Debt, Prime Rate plus Interest Rate Employee benefit plan, debt, prime rate plus interest rate. Employee Benefit Plan Eligibility and Participation Description Employee benefit plan eligibility and participation description. Eligibility and participation description EBP, Related Party and Party-in-Interest Transactions [Text Block] Related Party and Party In Interest Transactions Participant age Employee Benefit Plan, Participant Age Employee benefit plan, participant age. EBP, Change in Net Asset Available for Benefit, Increase (Decrease) Increase in net assets available for benefits before transfers EBP, Asset [Abstract] Assets: Transfers from The ESOP of UMB [Line Items] Transfers from the ESOP of UMB line Items. Document Type EBP, Description of Plan [Table] Subsequent Event [Member] Subsequent Event EBP, Contribution [Policy Text Block] Contributions EBP, Change in Net Asset Available for Benefit, Increase from Participant Contribution, Excluding Rollover Employee contributions EBP, Debt, Interest Rate Interest EBP, Statement of Change in Net Asset Available for Benefit [Abstract] EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Gain (Loss) on Investment EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Gain (Loss) on Investment, Total Net change in the fair value of investments Net appreciation in the fair value of investments Employee Benefit Plan, Participant Contribution, Increase Percentage Annually Employee benefit plan, participant contribution, increase percentage annually. Increases in employee's contribution rate by percent annually EBP, Change in Net Asset Available for Benefit, Increase from Employer Contribution, Cash Employer contributions EBP, Nonconsolidated, Master Trust and Plan Interest in Master Trust [Domain] Entity Registrant Name EBP, Related Party and Party-in-Interest Transactions [Table] EBP, Description of Plan [Text Block] Description of the Plan EBP, Subsequent Event [Line Items] EBP, Subsequent Event [Table] EBP, Accounting Policy, Accounting Standard Update, and Change in Accounting Principle [Abstract] EBP, Plan Name Balance Distributed to Participant in Cash [Member] Balance will distributed to participant in cash, member. Balance Distributed to Participant in Cash EBP, Plan Number EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Income (Loss) on Investment Total investment income Total Master Trust net investment income EBP, Investment, Excluding Plan Interest in Master Trust, Fair Value EBP, Investment, Excluding Plan Interest in Master Trust, Fair Value, Ending Balance EBP, Investment, Excluding Plan Interest in Master Trust, Fair Value, Beginning Balance EBP, Investment, Excluding Plan Interest in Master Trust, Fair Value, Total Investments, at fair value Common stock at a fair value EBP, Tax Status [Abstract] Costs and Expenses Employee Benefit Plan Costs and Expenses [Policy Text Block] Employee benefit plan costs and expenses policy. Allowance for Credit Losses Employee Benefit Plan Allowance for Credit Losses [Policy Text Block] Employee benefit plan allowance for credit losses policy. Employee Benefit Plan proceeds from a revenue sharing arrangement Employee Benefit Plan proceeds from a revenue sharing arrangement. Proceeds from a revenue sharing arrangement Mutual Fund [Member] Mutual Funds Cash EBP, Noninterest-Bearing Cash Subsequent Event Type [Axis] EBP, Change in Net Asset Available for Benefit, Decrease from Payment to Participant Benefits paid directly to participants Total receivables EBP, Receivable Total receivables EBP, Statement of Net Asset Available for Benefit [Line Items] Available forfeited nonvested accounts EBP, Forfeited Nonvested Account Entity Tax Identification Number EBP, Note Receivable from Participant, Account, Minimum Borrowing, Amount Minimum, participants may borrow from their accounts EBP, Note Receivable from Participant [Policy Text Block] Notes Receivable from Participants Entity [Domain] Schedule of Assets (Held at End of Year) EBP, Schedule of Asset Held for Investment [Text Block] EBP, Related Party and Party-in-Interest [Axis] EBP, Related Party and Party-in-Interest Transactions [Line Items] EBP, Form 5500 Caption, Receivables, Employer Contributions Profit sharing contributions included in employer contributions receivable Maximum [Member] Maximum EBP, Investment, Fair Value [Abstract] Investments, at fair value: EBP, Investment, Fair Value and NAV [Text Block] Fair Value Measurements Document Fiscal Year Focus EBP, Participant Contribution, Pretax, Maximum Annual Compensation to Total Compensation, Percentage Employee's contributions maximum percentage EBP, Change in Net Asset Available for Benefit, Increase from Contribution [Abstract] Contributions Employee Benefit Plan Change In Net Asset Available For Benefit Increase Decrease After Transfers Employee benefit plan change in net asset available for benefit increase decrease after transfers. Increase in net assets available for benefits Employee Benefit Plan, Share Diversification Percentage Employee benefit plan, share diversification percentage. Percentage of diversification of shares Amendment Flag Transfers from The ESOP of UMB EBP, Change in Net Asset Available for Benefit, Transfer to (from) Fund within ESOP EBP, Subsequent Event [Text Block] Subsequent Event EBP, Tax Status [Table] Employee benefit plan, defined contribution plan, minimum service hour for eligibility Employee benefit plan, defined contribution plan, minimum service hour for eligibility. Employee benefit plan, defined contribution plan, minimum service hour for eligibility Investment, Identifier [Axis] EBP, Change in Net Asset Available for Benefit, Increase from Participant Contribution, Rollover Rollover contributions EBP, Receivable [Abstract] Receivables: EBP, Statement of Change in Net Asset Available for Benefit [Line Items] Employee Benefit Plan, Age, When Share Diversification Percentage is Fifty Percent Employee benefit plan, age, when share diversification percentage is fifty percent. Age when, share diversification percentage is 50 EBP, Master Trust [Table] Legal Entity [Axis] Share of net assets of UMB Retirement Master Trust Common stock fair value Investments, at fair value Schedule of Master Trust and Plan's Interest in Net Assets of Master Trust EBP, Master Trust [Table Text Block] Employee Benefit Plan, Share Diversification Percentage, Upon Attaining Age 60 Employee benefit plan, share diversification percentage, upon attaining age 60 Share diversification percentage, upon attaining age 60 Assets in the Fair Value Hierarchy [Member] Assets in the fair value hierarchy. Total Assets in the Fair Value Hierarchy EBP, Asset Held for Investment, Party-in-Interest [true false] Cover [Abstract] EBP, Asset Held for Investment EBP, Asset Held for Investment, Total EBP, Investment, Fair Value and NAV [Table] EBP, Schedule of Asset Held for Investment [Line Items] Employee Benefit Plan Investment Excluding Plan Interest In Master Trust Shares Employee benefit plan investment excluding plan interest in master trust shares. Number of common stock Transfers from The ESOP of UMB [Abstract] Transfers from the ESOP of UMB abstract. EBP, Investment, Fair Value and NAV [Line Items] EBP, Related Party and Party-in-Interest [Domain] EBP, Statement of Change in Net Asset Available for Benefit [Table] Provision for income taxes Provision for income taxes. EBP, Subsequent Event [Abstract] EBP, Master Trust [Line Items] S and P 500 [Member] T. Rowe Price [Member] Vanguard. Dodge & Cox [Member] Dodge & Cox. Vanguard [Member] S and P 500. UMB [Member] UMB. Carillon Reams [Member] T. Rowe Price. Fidelity. Carillon Reams. Fidelity [Member]