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Federal and State Income Taxes
3 Months Ended
Mar. 31, 2015
Income Tax Disclosure [Abstract]  
Federal and State Income Taxes
(11) Federal and State Income Taxes

The reconciliations of income (loss) attributable to continuing operations at the U.S. federal statutory tax rate to income tax expense are as follows (in thousands):
 
 
Three Months Ended March 31,
 
 
2015
 
2014
Amount:
 
 
 
 
Federal statutory tax
 
$
39,717

 
$
40,768

Tax exempt revenue
 
(2,246
)
 
(1,991
)
Effect of state income taxes, net of federal benefit
 
2,615

 
2,870

Utilization of tax credits:
 
 
 
 
Low-income housing tax credit, net of amortization
 
(757
)
 
(991
)
Other tax credits
 
(521
)
 
(381
)
Bank-owned life insurance
 
(804
)
 
(768
)
Charitable contributions to BOKF Foundation
 

 
(427
)
Other, net
 
380

 
357

Total
 
$
38,384

 
$
39,437


 
 
Three Months Ended March 31,
 
 
2015
 
2014
Percent of pretax income:
 
 
 
 
Federal statutory tax
 
35.0
 %
 
35.0
 %
Tax exempt revenue
 
(2.0
)
 
(1.7
)
Effect of state income taxes, net of federal benefit
 
2.3

 
2.5

Utilization of tax credits:
 
 
 
 
Low-income housing tax credit, net of amortization
 
(0.7
)
 
(0.9
)
Other tax credits
 
(0.5
)
 
(0.3
)
Bank-owned life insurance
 
(0.7
)
 
(0.7
)
Charitable contributions to BOKF Foundation
 

 
(0.4
)
Other, net
 
0.4

 
0.4

Total
 
33.8
 %
 
33.9
 %