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Employee Benefits (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
BOK Financial Pension Plan [Member] | Pension Plan [Member] |  |  |
BOK Financial Pension Plan [Abstract] |  |  |
Defined Benefit Plan, Plan Assets, Payment for Settlement | $ 15,500,000 |  |
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Assets Transferred to (from) Plan | $ (19,100,000) |  |
Defined Benefit Plan, Benefit Obligation |  | $ 20,000,000 |
Net periodic benefit credit |  | (2,200,000) | $ (1,300,000)
BOK Financial Pension Plan [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Nonrecurring [Member] | Pension Plan [Member] |  |  |
BOK Financial Pension Plan [Abstract] |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 39,000,000 |
BOK Financial 401(k) Plan [Member] |  |  |
BOK Financial 401(k) Plan [Abstract] |  |  |
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 |  |
Defined Contribution Plan, Additional Annual Employer Matching Contribution, Percent | 5.00% |  |
Contributions Non-Elective Annual Contributions For Qualified Employees | $ 750 |  |
Defined Contribution Plan, Annual Base Employee Compensation to Qualify for Non-Elective Employer Contributions, Maximum | $ 40,000 |  |
Defined Contribution Plan, Vesting Period for Employer Contributions | 5 years |  |
Defined Contribution Plan, Cost | $ 31,700,000 | $ 30,500,000 | $ 29,900,000
BOK Financial 401(k) Plan [Member] | Minimum [Member] |  |  |
BOK Financial 401(k) Plan [Abstract] |  |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Match | 50.00% |  |
BOK Financial 401(k) Plan [Member] | Maximum [Member] |  |  |
BOK Financial 401(k) Plan [Abstract] |  |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Match | 200.00% |  |

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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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