Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Numerator: [Abstract]:
Net income attributable to BOK Financial Corp. shareholders	$ 530,746	$ 520,273	$ 618,121
Less: Earnings allocated to participating securities	4,253	3,803	4,299
Numerator for basic earnings per share - income available to common shareholders	526,493	516,470	613,822
Effect of reallocating undistributed earnings of participating securities	0	0	0
Numerator for diluted earnings per share - income available to common shareholders	$ 526,493	$ 516,470	$ 613,822
Denominator: [Abstract]
Weighted average shares outstanding	66,184,832	67,706,014	69,071,511
Less: Participating securities included in weighted average shares outstanding (in shares)	533,263	493,286	479,591
Denominator for basic earnings per common share (in shares)	65,651,569	67,212,728	68,591,920
Dilutive effect of employee stock compensation plans (in shares)	0	7	2,402
Denominator for diluted earnings per common share (in shares)	65,651,569	67,212,735	68,594,322
Basic (in dollars per share)	$ 8.02	$ 7.68	$ 8.95
Diluted earnings per share (per share)	$ 8.02	$ 7.68	$ 8.95