Federal and State Income Taxes (Tables)

3 Months Ended

Mar. 31, 2014

Income Tax Disclosure [Abstract]

Reconciliation of income (loss) to income tax expense

	Three Months Ended
	March 31,
	2014			2013
Amount:
Federal statutory tax	$	40,090		$	47,654
Tax exempt revenue	(1,991		)	(1,742		)
Effect of state income taxes, net of federal benefit	2,870			3,378
Utilization of tax credits	(2,630		)	(1,722		)
Bank-owned life insurance	(768		)	(885		)
Charitable contributions to BOKF Foundation	(427		)	—
Other, net	357			413
Total	$	37,501		$	47,096

	Three Months Ended
	March 31,
	2014		2013
Percent of pretax income:
Federal statutory tax	35	%	35	%
Tax exempt revenue	(2	)	(1	)
Effect of state income taxes, net of federal benefit	3		3
Utilization of tax credits	(2	)	(1	)
Bank-owned life insurance	(1	)	(1	)
Charitable contributions to BOKF Foundation	—		—
Other, net	—		—
Total	33	%	35	%