Statistical Measurement [Domain] Statistical Measurement [Domain] Ten years or more Ten years or more [Member] Ten years or more of service for matching contributions. EBP, Related Party and Party-in-Interest Transactions EBP, Related Party and Party-in-Interest Transactions [Text Block] EBP, Change in Net Asset Available for Benefit, Increase from Interest Income on Note Receivable from Participant EBP, Change in Net Asset Available for Benefit, Increase from Interest Income on Note Receivable from Participant Document Information [Line Items] Document Information [Line Items] EBP, Note Receivable from Participant, Account, Maximum Borrowing, Amount EBP, Note Receivable from Participant, Account, Maximum Borrowing, Amount Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Participant Contribution, Pretax, Maximum Annual Compensation to Total Compensation, Percentage Participant Contribution, After-tax, Maximum Annual Compensation to Total Compensation, Percentage Maximum percentage of after-tax annual compensation that a participant in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)), is permitted to contribute to the Plan. EBP, Contribution EBP, Contribution [Policy Text Block] EBP, Description of Plan and Accounting Change [Abstract] Investment Type [Axis] Investment Type [Axis] EBP, Contingency [Line Items] EBP, Contingency [Line Items] EBP, Change in Net Asset Available for Benefit, Increase from Participant Contribution, Rollover EBP, Change in Net Asset Available for Benefit, Increase from Participant Contribution, Rollover EBP, Note Receivable from Participant, Account, Maximum Borrowing, to Total Account, Percentage EBP, Note Receivable from Participant, Account, Maximum Borrowing, to Total Account, Percentage QNEC Eligibility Service Period, Years QNEC Eligibility Service Period, Years QNEC Eligibility Service Period, Years Employer match eligibility time frame Employer match eligibility time frame Minimum months of service to become eligible for employer matching contributions. EBP, Tax Status EBP, Tax Status [Text Block] EBP, Contingency [Abstract] EBP, Description of Plan [Line Items] EBP, Description of Plan [Line Items] 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 Years of Service [Domain] Years of Service [Domain] Years of Service [Domain] EBP, Schedule of Asset Held for Investment [Table] EBP, Schedule of Asset Held for Investment [Table] EBP, Tax Qualification Status [Extensible Enumeration] EBP, Tax Qualification Status [Extensible Enumeration] EBP, Asset Held for Investment, Participant Loan, after Deemed Distribution EBP, Asset Held for Investment, Participant Loan, after Deemed Distribution Net assets available for benefits per the Form 5500 EBP, Form 5500 Caption, Net Assets EBP, Investment, Fair Value and NAV EBP, Investment, Fair Value and NAV [Text Block] Fifteen or more years Fifteen years or more [Member] Fifteen years or more of service for matching contributions Document Information, Document [Axis] Document Information, Document [Axis] EBP, Investment, Fair Value and NAV [Table] EBP, Investment, Fair Value and NAV [Table] EBP, Note Receivable from Participant, Allowance for Credit Loss EBP, Note Receivable from Participant, Allowance for Credit Loss Less: benefits payable at beginning of year EBP, Reconciliation to Form 5500, Payment to Participant, Prior Period, Decrease from Deemed Distribution EBP, maximum number of outstanding loans per participant EBP, maximum number of outstanding loans per participant Maximum amount of loans a participant may have outstanding. EBP, Expense EBP, Expense [Policy Text Block] Compensation Threshold Amount for Catch-up contributions, Roth basis required Compensation Threshold Amount for Catch-up contributions, Roth basis required Employees whose compensation exceeds the threshold for the year, must make their catch-up contributions on a Roth basis Employer Contribution, Qualified Non-Elective Contribution (QNEC) Maximum Applicable Amount Employer Contribution, Qualified Non-Elective Contribution (QNEC) Amount Employer Contribution, Qualified Non-Elective Contribution (QNEC) Amount EBP, Change in Net Asset Available for Benefit, Increase from Contribution EBP, Change in Net Asset Available for Benefit, Increase from Contribution Minimum Age for Voluntary Catchup Contributions Minimum Age for Voluntary Catchup Contributions Minimum Age for Voluntary Catchup Contributions EBP, Note Receivable from Participant, Account, Minimum Borrowing, Amount EBP, Note Receivable from Participant, Account, Minimum Borrowing, Amount Subsequent Event Subsequent Event [Member] EBP 002 EBP 002 [Member] BOKF Plan # 002 Age for Special Voluntary Catchup Contributions [Domain] Eligible Age for Voluntary "Super" Catchup Contributions Eligible Age for Voluntary "Super" Catchup Contributions from the SECURE Act 2.0 Employee Benefit Plan Involuntary Cash-out Distributions Distributed as Direct Rollover Employee Benefit Plan Involuntary Cash-out Distributions Distributed as default IRA or automatic IRA Employee benefit plan Involuntary cash-out distributions distributed as default IRA or automatic IRA. ParticipantContributionMaximumAnnualCompensationAmount Maximum Eligible Annual Compensation Limit for Employer matching Eligible compensation limit for employer matching contributions. EBP, Related Party and Party-in-Interest Transactions [Table] EBP, Related Party and Party-in-Interest Transactions [Table] EBP, Risk and Uncertainty [Table] EBP, Risk and Uncertainty [Table] EBP, Change in Net Asset Available for Benefit, Decrease from Payment to Participant Benefit payments per the financial statements EBP, Change in Net Asset Available for Benefit, Decrease from Payment to Participant Employer contributions EBP, Employer Contribution, Receivable EBP, Change in Net Asset Available for Benefit, Increase from Participant Contribution, Excluding Rollover EBP, Change in Net Asset Available for Benefit, Increase from Participant Contribution, Excluding Rollover EBP, Investment, Current Value, Type [Extensible Enumeration] EBP, Investment, Current Value, Type [Extensible Enumeration] Less than four years Less than four years [Member] Less than four years of service for matching contributions EBP, Payment to Participant EBP, Payment to Participant [Policy Text Block] EBP, Change in Net Asset Available for Benefit, Increase from Employer Contribution, Cash EBP, Change in Net Asset Available for Benefit, Increase from Employer Contribution, Cash and Noncash Net assets available for benefits EBP, Net Asset Available for Benefit, Beginning Balance EBP, Net Asset Available for Benefit, Ending Balance EBP, Net Asset Available for Benefit EBP, Net Asset Available for Benefit EBP, Reconciliation of Financial Statement to Form 5500 [Line Items] EBP, Reconciliation of Financial Statement to Form 5500 [Line Items] EBP, Schedule of Asset Held for Investment [Line Items] EBP, Schedule of Asset Held for Investment [Line Items] EBP, Accounting Policy [Line Items] EBP, Accounting Policy [Line Items] Total assets EBP, Asset EBP, Reconciliation of Financial Statement to Form 5500 EBP, Reconciliation of Financial Statement to Form 5500 [Table Text Block] EBP, Investment, Plan Interest in Master Trust, Fair Value EBP, Investment, Plan Interest in Master Trust, Fair Value EBP, Reconciliation of Financial Statement to Form 5500 [Table] EBP, Reconciliation of Financial Statement to Form 5500 [Table] EBP, Participant Contribution, Pretax, Maximum Annual Compensation, Amount EBP, Participant Contribution, Pretax, Maximum Annual Compensation, Amount Benefit payments per the Form 5500 EBP, Form 5500 Caption, Benefit Payment and Payments to Provide Benefits BOKF common stock EBP, Employer, Common Stock [Member] EBP, Participant Contribution, Automatic, Deferral Rate EBP, Participant Contribution, Automatic, Deferral Rate EBP, Investment, Level 3 Reconciliation, Decrease from Transfer out of Level 3 EBP, Investment, Level 3 Reconciliation, Decrease from Transfer out of Level 3 Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] EBP, Tax Status [Abstract] EBP, Change in Net Asset Available for Benefit, Increase (Decrease) EBP, Change in Net Asset Available for Benefit, Increase (Decrease) Cover [Abstract] EBP, Change in Net Asset Available for Benefit, Increase from Employer Contribution, Cash EBP, Change in Net Asset Available for Benefit, Increase from Employer Contribution, Cash Maximum [Member] Maximum [Member] EBP, Risk and Uncertainty [Line Items] EBP, Risk and Uncertainty [Line Items] EBP, Participant Contribution, Pretax, Maximum Annual Compensation to Total Compensation, Percentage EBP, Participant Contribution, Pretax, Maximum Annual Compensation to Total Compensation, Percentage Minimum [Member] Minimum [Member] Subsequent Event Type [Domain] Subsequent Event Type [Domain] EBP, Forfeited Nonvested Account, Decrease from Qualified Non-elective Contributions EBP, Forfeited Nonvested Account, Decrease from Qualified Non-elective Contributions Amount of decrease in forfeited nonvested account of employee stock purchase, saving, or similar plan (employee benefit plan (EBP)) from employer QNEC contribution. EBP, Schedule of Asset Held for Investment [Abstract] Entities [Table] Entities [Table] EBP, Reconciliation of Financial Statement to Form 5500 EBP, Reconciliation of Financial Statement to Form 5500 [Text Block] Entity [Domain] Entity [Domain] EBP, Asset Held for Investment EBP, Asset Held for Investment Investment, Identifier [Axis] Investment, Identifier [Axis] EBP, Tax Determination Letter, Obtained [true false] EBP, Tax Determination Letter, Obtained [true false] EBP, Investment, Fair Value and NAV [Abstract] EBP, Employer Contribution, Matching Percentage EBP, Employer Contribution, Matching Percentage Four to nine years Four to nine years [Member] Four to nine years of service for matching contributions EBP, Basis of Accounting EBP, Basis of Accounting [Policy Text Block] EBP, Subsequent Event [Line Items] EBP, Subsequent Event [Line Items] Years of Service [Axis] Years of Service [Axis] Employer matching contributions by years of service Document [Domain] Document [Domain] EBP, Tax Status [Line Items] EBP, Tax Status [Line Items] EBP, Statement of Change in Net Asset Available for Benefit [Table] EBP, Statement of Change in Net Asset Available for Benefit [Table] Less: benefits payable EBP, Reconciliation to Form 5500, Net Asset Available for Benefit, Allocation to Withdrawing Participant, Not yet Paid Registered investment companies Mutual Fund [Member] EBP, Description of Plan [Table] EBP, Description of Plan [Table] EBP, Asset Held for Investment, Party-in-Interest [true false] EBP, Asset Held for Investment, Party-in-Interest [true false] EBP, Reconciliation of Financial Statement to Form 5500 [Abstract] EBP, Reconciliation of Financial Statement to Form 5500 [Abstract] EBP, Investment EBP, Investment [Policy Text Block] Interest and dividends EBP, Investment Income, Receivable Amendment Flag Amendment Flag EBP, Contingency EBP, Contingency [Text Block] EBP, Change in Net Asset Available for Benefit, Decrease from Administrative Expense EBP, Change in Net Asset Available for Benefit, Decrease from Administrative Expense Collective investment funds measured at NAV1 Common Collective Trust [Member] EBP, Investment, Fair Value and NAV EBP, Investment, Fair Value and NAV [Table Text Block] EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value EBP, Statement of Change in Net Asset Available for Benefit [Abstract] EBP, Subsequent Event [Table] EBP, Subsequent Event [Table] EBP, Related Party and Party-in-Interest Transactions [Abstract] Employee Benefit Plan, Participant Contribution Special Pre-tax Maximum Annual Catch-Up Compensation Amount EBP, Participant Contribution Pre-tax Maximum Annual "Super" Catch-Up Compensation for ages 60-63, Amount Employee Benefit Plan, Participant Contribution Pre-tax Maximum Annual Super Catch-Up Compensation Amount from the SECURE Act 2.0 EBP, Forfeited Nonvested Account EBP, Forfeited Nonvested Account EBP, Related Party and Party-in-Interest Transactions [Line Items] EBP, Related Party and Party-in-Interest Transactions [Line Items] Ten to fourteen years Ten to fourteen years [Member] Ten to fourteen years of service for matching contributions EBP, Forfeited Nonvested Account, Decrease from Employer Contribution EBP, Forfeited Nonvested Account, Decrease from Employer Contribution EBP, Statement of Net Asset Available for Benefit [Abstract] EBP, Statement of Net Asset Available for Benefit [Abstract] EBP, Change in Net Asset Available for Benefit, Increase from Employer QNEC Contribution, Cash EBP, Change in Net Asset Available for Benefit, Increase from Employer QNEC Contribution Amount of increase in net asset available for benefit from QNEC contribution from employer of participant in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). Employee Benefit Plan, Participant Contribution Pre-tax Maximum Annual Catch-Up Compensation Amount Employee Benefit Plan, Participant Contribution Pre-tax Maximum Annual Catch-Up Compensation Amount Employee Benefit Plan, Participant Contribution Pre-tax Maximum Annual Catch-Up Compensation Amount EBP, Description of Plan EBP, Description of Plan [Text Block] EBP, Tax Determination Letter, Date EBP, Tax Determination Letter, Date EBP, Summary of Accounting Policy EBP, Summary of Accounting Policy [Text Block] EBP, Forfeited Nonvested Account, Decrease from Administrative Expense EBP, Forfeited Nonvested Account, Decrease from Administrative Expense Document Period End Date Document Period End Date EBP, Note Receivable from Participant EBP, Note Receivable from Participant [Policy Text Block] EBP, Vesting Percentage Per Year EBP, Vesting Percentage Per Year Percentage vested each year until five years of service are reached and becomes fully vested. EBP, Statement of Net Asset Available for Benefit [Line Items] EBP, Statement of Net Asset Available for Benefit [Line Items] Entity Central Index Key Entity Central Index Key EBP, Asset Held for Investment, Participant Loan, Interest Rate EBP, Asset Held for Investment, Participant Loan, Interest Rate Investments, at fair value (See Note 3) EBP, Investment, Excluding Plan Interest in Master Trust, Fair Value Legal Entity [Axis] Legal Entity [Axis] Entity Tax Identification Number Entity Tax Identification Number EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Income (Loss) on Investment EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Income (Loss) on Investment EBP, Investment, Level 3 Reconciliation, Increase from Transfer into Level 3 EBP, Investment, Level 3 Reconciliation, Increase from Transfer into Level 3 Compensation Threshold Amount for Employer Matching, Disqualifying Compensation Threshold Amount for Employer Matching, Disqualifying Compensation threshold amount that would disqualify an employee from receiving employer matching contributions the following year. Maximum Eligible Compensation limit for Matching Contributions Maximum Eligible Compensation limit for Matching Contributions Maximum Eligible Compensation limit for Matching Contributions EBP, Accounting Policy, Accounting Standard Update, and Change in Accounting Principle [Abstract] Employee Benefit Plan Involuntary Cash-out Distributions Distributed as Cash Employee Benefit Plan Involuntary Cash-out Distributions Distributed as Cash Employee Benefit Plan Involuntary Cash-out Distributions Distributed as Cash EBP, Plan Name EBP, Plan Name EBP, Plan Number EBP, Plan Number EBP, Investment, Issuer Name [Extensible Enumeration] EBP, Investment, Issuer Name [Extensible Enumeration] Document Type Document Type Fair Value, Inputs, Level 3 [Member] Fair Value, Inputs, Level 3 [Member] EBP, Administrative Expense paid by Employer EBP, Administrative Expense paid by Employer Administrative expenses paid for by BOKF EBP, Statement of Net Asset Available for Benefit [Table] EBP, Statement of Net Asset Available for Benefit [Table] EBP, Investment, Fair Value and NAV [Line Items] EBP, Investment, Fair Value and NAV [Line Items] EBP, Note Receivable From Participant General Loan Maximum Borrowing Term EBP, Note Receivable From Participant General Loan Maximum Borrowing Term Maximum borrowing term for participant loans EBP, Use of Estimate EBP, Use of Estimate [Policy Text Block] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Statistical Measurement [Axis] Statistical Measurement [Axis] Unsettled securities sales EBP, Investment Sale, Receivable Notes from participants EBP, Note Receivable from Participant Fair Value, Inputs, Level 2 [Member] Fair Value, Inputs, Level 2 [Member] EBP, Schedule of Asset Held for Investment EBP, Schedule of Asset Held for Investment [Table Text Block] EBP, Subsequent Event, Description EBP, Subsequent Event, Description 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 Cash, non-interest bearing EBP, Noninterest-Bearing Cash Add: benefits payable at end of year EBP, Reconciliation to Form 5500, Payment to Participant, Current Period, Increase from Deemed Distribution EBP, Contingency [Table] EBP, Contingency [Table] EBP, Accounting Policy [Table] EBP, Accounting Policy [Table] Investments [Domain] Investments [Domain] EBP, Subsequent Event [Abstract] Employer Discretionary Contribution Amount Employer Discretionary Contribution Amount Employer Discretionary Contribution Amount Entity Information [Line Items] Entity Information [Line Items] Self-directed brokerage accounts EBP, Self-Directed Brokerage Account [Member] Document Information [Table] Document Information [Table] EBP, Statement of Change in Net Asset Available for Benefit [Line Items] EBP, Statement of Change in Net Asset Available for Benefit [Line Items] Compensation Threshold Amount for Employer Qualified Non-Elective Contribution Compensation Threshold Amount for Employer Qualified Non-Elective Contribution Employees who make less than this threshold are eligible for Employer Qualified Non-Elective Contributions EBP, Risk and Uncertainty [Abstract] EBP, Vested balance of terminated employee that remains in plan unless directed by participant EBP, Vested balance of terminated employee that remains in plan unless directed by participant Vested balance of terminated employee that remains in plan unless directed by participant Fair Value, Inputs, Level 1 [Member] Fair Value, Inputs, Level 1 [Member] Entity Registrant Name Entity Registrant Name EBP, Subsequent Event [Text Block] EBP, Subsequent Event [Text Block] EBP, Administration Cost, Absorbed by Employer [true false] EBP, Administration Cost, Absorbed by Employer [true false] EBP, Contribution EBP, Contribution [Table Text Block] QNEC Eligibility Service Period, Hours QNEC Eligibility Service Period, Hours QNEC Eligibility Service Period, Hours EBP, Tax Status [Table] EBP, Tax Status [Table] Primary residence, borrowing term EBP, Note Receivable From Participant, Account, Primary Residence, Maximum Borrowing Term Maximum borrowing term for participant loan for primary residence Total receivables EBP, Receivable EBP, Employer Contribution, Participant Compensation Matched, Percentage EBP, Employer Contribution, Participant Compensation Matched, Percentage EBP, Risk and Uncertainty EBP, Risk and Uncertainty [Text Block] Due on unsettled securities purchases EBP, Liability for Investment Purchase Qualified Plan [Member] BOK Financial Corporation [Member] BOK Financial Corporation Cavanal Hill Funds [Member] Cavanal Hill Funds Money Market Funds [Member] American Funds [Member] American Funds Balanced Funds [Member] American Beacon [Member] American Beacon Equity Funds [Member] Neuberger and Berman [Member] Neuberger and Berman Dodge and Cox [Member] Dodge and Cox Fidelity [Member] Fidelity Invesco Oppenheimer [Member] Invesco Oppenheimer JP Morgan [Member] JP Morgan Metropolitan West [Member] Metropolitan West Fixed Income Funds [Member] BOK Financial Retirement Fund [Member] BOK Financial Retirement Fund Vanguard [Member] Vanguard John Hancock [Member] John Hancock MFS Investment Management [Member] MFS Investment Management BOK Financial Strategic International Fund [Member] BOK Financial Strategic International Fund Self-directed brokerage accounts [Member] Self-directed brokerage accounts