Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Numerator: [Abstract]
Net income attributable to BOK Financial Corp. shareholders	$ 162,368	$ 62,488
Less: Earnings allocated to participating securities	1,255	451
Numerator for basic earnings per share – income available to common shareholders	161,113	62,037
Effect of reallocating undistributed earnings of participating securities	0	0
Numerator for diluted earnings per share – income available to common shareholders	$ 161,113	$ 62,037
Denominator: [Abstract]
Weighted average shares outstanding (in shares)	66,849,288	68,306,107
Less: Participating securities included in weighted average shares (in shares)	517,513	493,707
Denominator for basic earnings per common share (in shares)	66,331,775	67,812,400
Dilutive effect of employee stock compensation plans (in shares)	0	1,451
Denominator for diluted earnings per common share (in shares)	66,331,775	67,813,851
Basic earnings per share	$ 2.43	$ 0.91
Diluted earnings per share	$ 2.43	$ 0.91