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Employee Benefits (Details) - BOK Financial 401(k) Plan [Member] - USD ($) | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Defined Benefit Plans and Other Postretirement Benefit Plans[Line Items] |  |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay | 6.00% |  |
Defined Contribution Plan, Minimum Years of Service for Employees to Obtain Maximum Employer Matching | 4 years |  |
Defined Contribution Plan, Maximum Years of Service for Employees to Obtain Minimum Employer Matching | 15 years |  |
Contributions Non-Elective Annual Contributions For Qualified Employees | $ 600 |  |
Defined Contribution Plan, Annual Base Employee Compensation to Qualify for Non-Elective Employer Contributions, Maximum | $ 60,000 |  |
Defined Contribution Plan, Vesting Period for Employer Contributions | 5 years |  |
Defined Contribution Plan, Cost | $ 32,900,000 | $ 31,700,000 | $ 30,500,000
Minimum [Member] |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans[Line Items] |  |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Match | 50.00% |  |
Maximum [Member] |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans[Line Items] |  |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Match | 200.00% |  |

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- Definition Non-elective annual contributions to a defined pension plan for qualified employees. + References No definition available. + Details
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- Definition The maximum annual base employee compensation to qualify for non-elective employer contributions under the deferred compensation plan. + References No definition available. + Details
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- Definition The maximum years of service for employees to obtain minimum employer matching under a defined contribution plan. + References No definition available. + Details
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- Definition The minimum years of service for employees to obtain maximum employer matching under a defined contribution plan. + References No definition available. + Details
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- Definition The vesting period for employer contributions to defined contribution plan. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 70 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480794/715-70-50-1 + Details
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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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- Definition Percentage employer matches of the employee's percentage contribution matched. + References No definition available. + Details
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- Details
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- Details
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