Employee Benefits (Details) - BOK Financial 401(k) Plan [Member] - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
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	$ 35,500,000	$ 32,900,000	$ 31,700,000
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%