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Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Numerator: [Abstract]
Net income attributable to BOK Financial Corp. shareholders	$ 117,256	$ 85,649	$ 337,190	$ 262,152
Less: Earnings allocated to participating securities	963	888	2,940	2,817
Numerator for basic earnings per share – income available to common shareholders	116,293	84,761	334,250	259,335
Effect of reallocating undistributed earnings of participating securities	1	1	1	2
Numerator for diluted earnings per share – income available to common shareholders	$ 116,294	$ 84,762	$ 334,251	$ 259,337
Denominator: [Abstract]
Weighted average shares outstanding (in shares)	65,438,849	65,423,258	65,455,306	65,432,313
Less: Participating securities included in weighted average shares (in shares)	537,754	680,436	571,987	702,922
Denominator for basic earnings per common share (in shares)	64,901,095	64,742,822	64,883,319	64,729,391
Dilutive effect of employee stock compensation plans (in shares)	33,256	62,350	36,409	64,502
Denominator for diluted earnings per common share (in shares)	64,934,351	64,805,172	64,919,728	64,793,893
Basic earnings per share (per share)	$ 1.79	$ 1.31	$ 5.15	$ 4.01
Diluted earnings per share (per share)	$ 1.79	$ 1.31	$ 5.15	$ 4.00
Excludes employee stock options with exercise prices greater than current market price.	0	0	0	0

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