Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016		Sep. 30, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 75,112	$ 75,816	$ 182,372		$ 231,183
Other comprehensive income (loss) before income taxes:
Net change in unrealized gain (loss)	(33,458)	57,892	133,108		57,763
Reclassification adjustments included in earnings:
Interest revenue, Investment securities, Taxable securities	0	(105)	(112)		(418)
Interest expense, Subordinated debentures	0	0	0		121
Net impairment losses recognized in earnings	0	0	0		92
Gain on available for sale securities, net	(2,394)	(2,166)	(11,684)		(9,926)
Other comprehensive income (loss) before income taxes	(35,852)	55,621	121,312		47,632
Federal and state income taxes	(13,947)	21,637	47,172	[1]	18,529	[1]
Other comprehensive income (loss), net of income taxes	(21,905)	33,984	74,140		29,103
Comprehensive income	53,207	109,800	256,512		260,286
Comprehensive income (loss) attributable to non-controlling interests	835	925	(270)		2,219
Comprehensive income attributable to BOK Financial Corp. shareholders	$ 52,372	$ 108,875	$ 256,782		$ 258,067

[1] Calculated using a 39 percent effective tax rate.