Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Numerator: [Abstract]
Net income attributable to BOK Financial Corp. shareholders	$ 132,846	$ 166,421	$ 195,334	$ 312,481
Less: Earnings allocated to participating securities	949	1,170	1,400	2,107
Numerator for basic earnings per share – income available to common shareholders	131,897	165,251	193,934	310,374
Effect of reallocating undistributed earnings of participating securities	0	1	0	0
Numerator for diluted earnings per share – income available to common shareholders	$ 131,897	$ 165,252	$ 193,934	$ 310,374
Denominator: [Abstract]
Weighted average shares outstanding (in shares)	67,938,607	69,302,245	68,105,679	69,442,239
Less: Participating securities included in weighted average shares (in shares)	484,859	486,579	489,283	466,496
Denominator for basic earnings per common share (in shares)	67,453,748	68,815,666	67,616,396	68,975,743
Dilutive effect of employee stock compensation plans (in shares)	1,424	1,776	1,438	3,055
Denominator for diluted earnings per common share (in shares)	67,455,172	68,817,442	67,617,834	68,978,798
Basic earnings per share	$ 1.96	$ 2.40	$ 2.87	$ 4.50
Diluted earnings per share	$ 1.96	$ 2.40	$ 2.87	$ 4.50