Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019		Sep. 30, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 141,858	$ 117,545	$ 389,903		$ 338,047
Other comprehensive income (loss) before income taxes:
Net change in unrealized gain (loss)	46,285	(35,941)	274,441		(166,464)
Reclassification adjustments included in earnings:
Loss (gain) on available for sale securities, net	(5)	(250)	(1,110)		802
Other comprehensive income (loss) before income taxes	46,280	(36,191)	273,331		(165,662)
Federal and state income taxes	11,096	(9,134)	66,993	[1]	(42,183)	[1]
Other comprehensive income (loss), net of income taxes	35,184	(27,057)	206,338		(123,479)
Comprehensive income	177,042	90,488	596,241		214,568
Comprehensive income (loss) attributable to non-controlling interests	(373)	289	(503)		857
Comprehensive income attributable to BOK Financial Corp. shareholders	$ 177,415	$ 90,199	$ 596,744		$ 213,711

[1] Calculated using a 25 percent blended federal and state statutory tax rate.