Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2017	Mar. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income		$ 88,664	$ 40,988
Other comprehensive income before income taxes:
Net change in unrealized gain (loss)		11,411	121,091
Reclassification adjustments included in earnings:
Interest revenue, Investment securities, Taxable securities		0	(69)
Gain on available for sale securities, net		(2,049)	(3,964)
Other comprehensive income before income taxes		9,362	117,058
Federal and state income taxes	[1]	3,616	45,536
Other comprehensive income, net of income taxes		5,746	71,522
Comprehensive income		94,410	112,510
Comprehensive income (loss) attributable to non-controlling interests		308	(1,576)
Comprehensive income attributable to BOK Financial Corp. shareholders		$ 94,102	$ 114,086

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