Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013		Jun. 30, 2012
Statement of Other Comprehensive Income [Abstract]
Net income	$ 79,888	$ 99,461	$ 168,947		$ 182,654
Other comprehensive income before income taxes:
Net change in unrealized gain (loss)	(183,186)	(15,401)	(204,545)		40,034
Reclassification adjustments included in earnings [Abstract]
Interest revenue, Investment securities, Taxable securities	(873)	(1,633)	(2,021)		(3,421)
Interest Expense, Subordinated debentures	72	279	124		331
Net impairment losses recognized in earnings	552	858	799		4,580
Gain on available for sale securities, net	(3,753)	(20,481)	(8,608)		(24,812)
Other comprehensive income (loss), before income taxes	(187,188)	(36,378)	(214,251)		16,712
Income tax benefit (expense)	72,819	14,150	83,345	[1]	(6,501)	[1]
Other comprehensive income (loss), net of income taxes	(114,369)	(22,228)	(130,906)		10,211
Comprehensive income	(34,481)	77,233	38,041		192,865
Comprehensive income (loss) attributable to non-controlling interests	(43)	1,833	1,052		1,411
Comprehensive income attributed to BOK Financial Corp. shareholders	$ (34,438)	$ 75,400	$ 36,989		$ 191,454

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