Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Numerator: [Abstract]
Net income attributable to BOK Financial Corp. shareholders	$ 62,488	$ 146,060
Less: Earnings allocated to participating securities	451	937
Numerator for basic earnings per share – income available to common shareholders	62,037	145,123
Effect of reallocating undistributed earnings of participating securities	0	0
Numerator for diluted earnings per share – income available to common shareholders	$ 62,037	$ 145,123
Denominator: [Abstract]
Weighted average shares outstanding (in shares)	68,306,107	69,583,788
Less: Participating securities included in weighted average shares (in shares)	493,707	446,413
Denominator for basic earnings per common share (in shares)	67,812,400	69,137,375
Dilutive effect of employee stock compensation plans (in shares)	1,451	4,335
Denominator for diluted earnings per common share (in shares)	67,813,851	69,141,710
Basic earnings per share	$ 0.91	$ 2.10
Diluted earnings per share	$ 0.91	$ 2.10