Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017		Jun. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 88,866	$ 66,272	$ 177,530		$ 107,260
Other comprehensive income before income taxes:
Net change in unrealized gain (loss)	21,958	45,475	33,369		166,566
Reclassification adjustments included in earnings:
Interest revenue, Investment securities, Taxable securities	0	(43)	0		(112)
Gain on available for sale securities, net	(380)	(5,326)	(2,429)		(9,290)
Other comprehensive income before income taxes	21,578	40,106	30,940		157,164
Federal and state income taxes	8,393	15,583	12,009	[1]	61,119	[1]
Other comprehensive income, net of income taxes	13,185	24,523	18,931		96,045
Comprehensive income	102,051	90,795	196,461		203,305
Comprehensive income (loss) attributable to non-controlling interests	719	471	1,027		(1,105)
Comprehensive income attributable to BOK Financial Corp. shareholders	$ 101,332	$ 90,324	$ 195,434		$ 204,410

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