Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014		Jun. 30, 2013
Statement of Comprehensive Income [Abstract]
Net income	$ 76,729	$ 79,888	$ 153,772		$ 168,947
Other comprehensive income (loss) before income taxes: [Abstract]
Net change in unrealized gain (loss)	70,038	(183,186)	124,651		(204,545)
Reclassification adjustments included in earnings [Abstract]
Interest revenue, Investment securities, Taxable securities	(333)	(873)	(736)		(2,021)
Interest expense, Subordinated debentures	71	72	154		124
Net impairment losses recognized in earnings	0	552	0		799
Gain on available for sale securities, net	(4)	(3,753)	(1,244)		(8,608)
Other comprehensive income (loss) before income taxes	69,772	(187,188)	122,825		(214,251)
Federal and state income taxes	(27,151)	72,819	(47,786)	[1]	83,345	[1]
Other comprehensive income (loss), net of income taxes	42,621	(114,369)	75,039		(130,906)
Comprehensive income (loss)	119,350	(34,481)	228,811		38,041
Comprehensive income (loss) attributable to non-controlling interests	834	(43)	1,287		1,052
Comprehensive income (loss) attributable to BOK Financial Corp. shareholders	$ 118,516	$ (34,438)	$ 227,524		$ 36,989

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