Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014		Sep. 30, 2013
Statement of Comprehensive Income [Abstract]
Net income	$ 76,126	$ 76,062	$ 229,898		$ 245,009
Other comprehensive income (loss) before income taxes: [Abstract]
Net change in unrealized gain (loss)	(42,399)	(35,839)	82,252		(240,384)
Reclassification adjustments included in earnings [Abstract]
Interest revenue, Investment securities, Taxable securities	(273)	(696)	(1,009)		(2,717)
Interest expense, Subordinated debentures	52	85	206		209
Net impairment losses recognized in earnings	0	1,509	0		2,308
Gain on available for sale securities, net	(146)	(478)	(1,390)		(9,086)
Other comprehensive income (loss) before income taxes	(42,766)	(35,419)	80,059		(249,670)
Federal and state income taxes	16,645	13,779	(31,141)	[1]	97,124	[1]
Other comprehensive income (loss), net of income taxes	(26,121)	(21,640)	48,918		(152,546)
Comprehensive income	50,005	54,422	278,816		92,463
Comprehensive income attributable to non-controlling interests	494	324	1,781		1,376
Comprehensive income attributable to BOK Financial Corp. shareholders	$ 49,511	$ 54,098	$ 277,035		$ 91,087

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