Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Numerator: [Abstract]
Net income attributable to BOK Financial Corp. shareholders	$ 151,308	$ 132,846	$ 313,676	$ 195,334
Less: Earnings allocated to participating securities	1,202	949	2,457	1,400
Numerator for basic earnings per share – income available to common shareholders	150,106	131,897	311,219	193,934
Effect of reallocating undistributed earnings of participating securities	0	0	0	0
Numerator for diluted earnings per share – income available to common shareholders	$ 150,106	$ 131,897	$ 311,219	$ 193,934
Denominator: [Abstract]
Weighted average shares outstanding (in shares)	66,521,728	67,938,607	66,684,603	68,105,679
Less: Participating securities included in weighted average shares (in shares)	527,596	484,859	522,555	489,283
Denominator for basic earnings per common share (in shares)	65,994,132	67,453,748	66,162,048	67,616,396
Dilutive effect of employee stock compensation plans (in shares)	0	1,424	0	1,438
Denominator for diluted earnings per common share (in shares)	65,994,132	67,455,172	66,162,048	67,617,834
Basic earnings per share	$ 2.27	$ 1.96	$ 4.70	$ 2.87
Diluted earnings per share	$ 2.27	$ 1.96	$ 4.70	$ 2.87