Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Numerator: [Abstract]
Net income attributable to BOK Financial Corp. shareholders	$ 134,495	$ 156,510	$ 448,171	$ 351,844
Less: Earnings allocated to participating securities	1,104	1,161	3,561	2,562
Numerator for basic earnings per share – income available to common shareholders	133,391	155,349	444,610	349,282
Effect of reallocating undistributed earnings of participating securities	0	0	0	0
Numerator for diluted earnings per share – income available to common shareholders	$ 133,391	$ 155,349	$ 444,610	$ 349,282
Denominator: [Abstract]
Weighted average shares outstanding (in shares)	66,090,988	67,503,041	66,484,557	67,902,592
Less: Participating securities included in weighted average shares (in shares)	542,681	499,842	529,263	492,803
Denominator for basic earnings per common share (in shares)	65,548,307	67,003,199	65,955,294	67,409,789
Dilutive effect of employee stock compensation plans (in shares)	0	1,424	0	1,433
Denominator for diluted earnings per common share (in shares)	65,548,307	67,004,623	65,955,294	67,411,222
Basic earnings per share	$ 2.04	$ 2.32	$ 6.74	$ 5.18
Diluted earnings per share	$ 2.04	$ 2.32	$ 6.74	$ 5.18