v3.26.1
Employee Benefit Plan, Schedule, Asset Held for Investment (Details) - EBP 002
12 Months Ended
Dec. 31, 2025
USD ($)
EBP, Schedule of Asset Held for Investment [Line Items]  
EBP, Asset Held for Investment, Participant Loan, after Deemed Distribution $ 16,180,252 [1]
Entity Tax Identification Number 73-0780382
EBP, Plan Number 002
EBP, Plan Name BOK FINANCIAL 401(k) PLAN
EBP, Asset Held for Investment $ 1,327,692,964
Investment, Identifier [Axis]: American Beacon International Value Fund  
EBP, Schedule of Asset Held for Investment [Line Items]  
EBP, Investment, Issuer Name [Extensible Enumeration] American Beacon [Member]
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value $ 12,726,090
EBP, Investment, Current Value, Type [Extensible Enumeration] Equity Funds [Member]
Investment, Identifier [Axis]: American Funds Balanced Fund  
EBP, Schedule of Asset Held for Investment [Line Items]  
EBP, Investment, Issuer Name [Extensible Enumeration] American Funds [Member]
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value $ 45,996,799
EBP, Investment, Current Value, Type [Extensible Enumeration] Balanced Funds [Member]
Investment, Identifier [Axis]: BOK Financial Corporation BOKF Common Stock  
EBP, Schedule of Asset Held for Investment [Line Items]  
EBP, Investment, Issuer Name [Extensible Enumeration] BOK Financial Corporation [Member] [1]
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value $ 51,063,570 [1]
EBP, Asset Held for Investment, Party-in-Interest [true false] true [1]
EBP, Investment, Current Value, Type [Extensible Enumeration] BOKF common stock [1]
Investment, Identifier [Axis]: BOKF Retirement Fund 2020 Class III Fund  
EBP, Schedule of Asset Held for Investment [Line Items]  
EBP, Investment, Issuer Name [Extensible Enumeration] BOK Financial Retirement Fund [Member] [1]
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value $ 25,591,578 [1]
EBP, Asset Held for Investment, Party-in-Interest [true false] true [1]
EBP, Investment, Current Value, Type [Extensible Enumeration] Registered investment companies [1]
Investment, Identifier [Axis]: BOKF Retirement Fund 2030 Class III Fund  
EBP, Schedule of Asset Held for Investment [Line Items]  
EBP, Investment, Issuer Name [Extensible Enumeration] BOK Financial Retirement Fund [Member] [1]
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value $ 101,453,379 [1]
EBP, Asset Held for Investment, Party-in-Interest [true false] true [1]
EBP, Investment, Current Value, Type [Extensible Enumeration] Registered investment companies [1]
Investment, Identifier [Axis]: BOKF Retirement Fund 2040 Class III Fund  
EBP, Schedule of Asset Held for Investment [Line Items]  
EBP, Investment, Issuer Name [Extensible Enumeration] BOK Financial Retirement Fund [Member] [1]
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value $ 107,647,029 [1]
EBP, Asset Held for Investment, Party-in-Interest [true false] true [1]
EBP, Investment, Current Value, Type [Extensible Enumeration] Registered investment companies [1]
Investment, Identifier [Axis]: BOKF Retirement Fund 2050 Class III Fund  
EBP, Schedule of Asset Held for Investment [Line Items]  
EBP, Investment, Issuer Name [Extensible Enumeration] BOK Financial Retirement Fund [Member] [1]
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value $ 92,532,836 [1]
EBP, Asset Held for Investment, Party-in-Interest [true false] true [1]
EBP, Investment, Current Value, Type [Extensible Enumeration] Registered investment companies [1]
Investment, Identifier [Axis]: BOKF Retirement Fund 2060 Class III Fund  
EBP, Schedule of Asset Held for Investment [Line Items]  
EBP, Investment, Issuer Name [Extensible Enumeration] BOK Financial Retirement Fund [Member] [1]
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value $ 36,537,423 [1]
EBP, Asset Held for Investment, Party-in-Interest [true false] true [1]
EBP, Investment, Current Value, Type [Extensible Enumeration] Registered investment companies [1]
Investment, Identifier [Axis]: BOKF Retirement Fund 2070 Class III Fund  
EBP, Schedule of Asset Held for Investment [Line Items]  
EBP, Investment, Issuer Name [Extensible Enumeration] BOK Financial Retirement Fund [Member] [1]
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value $ 3,837,720 [1]
EBP, Asset Held for Investment, Party-in-Interest [true false] true [1]
EBP, Investment, Current Value, Type [Extensible Enumeration] Registered investment companies [1]
Investment, Identifier [Axis]: BOKF Retirement Fund Conservative Class III Fund  
EBP, Schedule of Asset Held for Investment [Line Items]  
EBP, Investment, Issuer Name [Extensible Enumeration] BOK Financial Retirement Fund [Member] [1]
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value $ 5,696,581 [1]
EBP, Asset Held for Investment, Party-in-Interest [true false] true [1]
EBP, Investment, Current Value, Type [Extensible Enumeration] Registered investment companies [1]
Investment, Identifier [Axis]: BOKF Retirement Fund Income Class III Fund  
EBP, Schedule of Asset Held for Investment [Line Items]  
EBP, Investment, Issuer Name [Extensible Enumeration] BOK Financial Retirement Fund [Member] [1]
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value $ 498,414 [1]
EBP, Asset Held for Investment, Party-in-Interest [true false] true [1]
EBP, Investment, Current Value, Type [Extensible Enumeration] Registered investment companies [1]
Investment, Identifier [Axis]: BOKF Strategic International Fund Strategic International Class III Fund  
EBP, Schedule of Asset Held for Investment [Line Items]  
EBP, Investment, Issuer Name [Extensible Enumeration] BOK Financial Strategic International Fund [Member] [1]
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value $ 23,541,673 [1]
EBP, Asset Held for Investment, Party-in-Interest [true false] true [1]
EBP, Investment, Current Value, Type [Extensible Enumeration] Registered investment companies [1]
Investment, Identifier [Axis]: Cavanal Hill Funds Government Securities Money Market Fund  
EBP, Schedule of Asset Held for Investment [Line Items]  
EBP, Investment, Issuer Name [Extensible Enumeration] Cavanal Hill Funds [Member] [1]
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value $ 64,265,543 [1]
EBP, Asset Held for Investment, Party-in-Interest [true false] true [1]
EBP, Investment, Current Value, Type [Extensible Enumeration] Money Market Funds [Member] [1]
Investment, Identifier [Axis]: Dodge and Cox Large Cap Value Fund  
EBP, Schedule of Asset Held for Investment [Line Items]  
EBP, Investment, Issuer Name [Extensible Enumeration] Dodge and Cox [Member]
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value $ 89,906,149
EBP, Investment, Current Value, Type [Extensible Enumeration] Equity Funds [Member]
Investment, Identifier [Axis]: Fidelity Large Cap Core Index Fund  
EBP, Schedule of Asset Held for Investment [Line Items]  
EBP, Investment, Issuer Name [Extensible Enumeration] Fidelity [Member]
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value $ 185,302,003
EBP, Investment, Current Value, Type [Extensible Enumeration] Equity Funds [Member]
Investment, Identifier [Axis]: Invesco Oppenheimer International Growth Fund  
EBP, Schedule of Asset Held for Investment [Line Items]  
EBP, Investment, Issuer Name [Extensible Enumeration] Invesco Oppenheimer [Member]
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value $ 11,601,152
EBP, Investment, Current Value, Type [Extensible Enumeration] Registered investment companies
Investment, Identifier [Axis]: JP Morgan Large Cap Growth Fund  
EBP, Schedule of Asset Held for Investment [Line Items]  
EBP, Investment, Issuer Name [Extensible Enumeration] JP Morgan [Member]
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value $ 146,678,775
EBP, Investment, Current Value, Type [Extensible Enumeration] Equity Funds [Member]
Investment, Identifier [Axis]: John Hancock Disciplined Value Midcap Fund  
EBP, Schedule of Asset Held for Investment [Line Items]  
EBP, Investment, Issuer Name [Extensible Enumeration] John Hancock [Member]
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value $ 22,749,341
EBP, Investment, Current Value, Type [Extensible Enumeration] Equity Funds [Member]
Investment, Identifier [Axis]: MFS Investment Management Mid Cap Growth  
EBP, Schedule of Asset Held for Investment [Line Items]  
EBP, Investment, Issuer Name [Extensible Enumeration] MFS Investment Management [Member]
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value $ 41,050,991
EBP, Investment, Current Value, Type [Extensible Enumeration] Equity Funds [Member]
Investment, Identifier [Axis]: Metropolitan West Total Return Bond Fund  
EBP, Schedule of Asset Held for Investment [Line Items]  
EBP, Investment, Issuer Name [Extensible Enumeration] Metropolitan West [Member]
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value $ 28,153,998
EBP, Investment, Current Value, Type [Extensible Enumeration] Fixed Income Funds [Member]
Investment, Identifier [Axis]: Neuberger and Berman Small Cap Core Fund  
EBP, Schedule of Asset Held for Investment [Line Items]  
EBP, Investment, Issuer Name [Extensible Enumeration] Neuberger and Berman [Member]
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value $ 35,488,915
EBP, Investment, Current Value, Type [Extensible Enumeration] Equity Funds [Member]
Investment, Identifier [Axis]: Self-directed brokerage accounts, common stocks, bonds, and RICs  
EBP, Schedule of Asset Held for Investment [Line Items]  
EBP, Investment, Issuer Name [Extensible Enumeration] Self-directed brokerage accounts [Member]
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value $ 92,085,693
EBP, Investment, Current Value, Type [Extensible Enumeration] Self-directed brokerage accounts
Investment, Identifier [Axis]: Vanguard Midcap Index Fund  
EBP, Schedule of Asset Held for Investment [Line Items]  
EBP, Investment, Issuer Name [Extensible Enumeration] Vanguard [Member]
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value $ 45,427,718
EBP, Investment, Current Value, Type [Extensible Enumeration] Registered investment companies
Investment, Identifier [Axis]: Vanguard Short Term Bond Index Fund  
EBP, Schedule of Asset Held for Investment [Line Items]  
EBP, Investment, Issuer Name [Extensible Enumeration] Vanguard [Member]
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value $ 21,817,581
EBP, Investment, Current Value, Type [Extensible Enumeration] Fixed Income Funds [Member]
Investment, Identifier [Axis]: Vanguard Small Cap Value Index Fund  
EBP, Schedule of Asset Held for Investment [Line Items]  
EBP, Investment, Issuer Name [Extensible Enumeration] Vanguard [Member]
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value $ 19,861,761
EBP, Investment, Current Value, Type [Extensible Enumeration] Registered investment companies
Minimum [Member]  
EBP, Schedule of Asset Held for Investment [Line Items]  
EBP, Asset Held for Investment, Participant Loan, Interest Rate 3.25%
Maximum [Member]  
EBP, Schedule of Asset Held for Investment [Line Items]  
EBP, Asset Held for Investment, Participant Loan, Interest Rate 8.50%
[1] Indicates party-in-interest to the Plan.