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Federal and State Income Taxes
 9 Months Ended
Sep. 30, 2015
Income Tax Disclosure [Abstract]  
Federal and State Income Taxes
(12) 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
September 30,
 
Nine Months Ended
Sept. 30,
 
 
2015
 
2014
 
2015
 
2014
Amount:
 
 
 
 
 
 
 
 
Federal statutory tax
 
$
38,481

 
$
38,475

 
$
120,514

 
$
120,379

Tax exempt revenue
 
(2,473
)
 
(2,164
)
 
(7,041
)
 
(6,254
)
Effect of state income taxes, net of federal benefit
 
2,586

 
2,328

 
7,711

 
7,655

Utilization of tax credits:
 
 
 
 
 


 


Low-income housing tax credit, net of amortization
 
(1,163
)
 
(969
)
 
(2,975
)
 
(1,801
)
Other tax credits
 
(521
)
 
(527
)
 
(1,564
)
 
(1,582
)
Bank-owned life insurance
 
(818
)
 
(806
)
 
(2,450
)
 
(2,358
)
Reduction of tax accrual
 
(1,967
)
 
(2,281
)
 
(1,967
)
 
(2,281
)
Charitable contributions to BOKF Foundation
 
(99
)
 
—

 
(99
)
 
(427
)
Other, net
 
102

 
(254
)
 
1,013

 
711

Total
 
$
34,128

 
$
33,802

 
$
113,142

 
$
114,042



 
 
Three Months Ended
September 30,
 
Nine Months Ended
Sept. 30,
 
 
2015
 
2014
 
2015
 
2014
Percent of pretax income:
 
 
 
 
 
 
 
 
Federal statutory tax
 
35.0
 %
 
35.0
 %
 
35.0
 %
 
35.0
 %
Tax exempt revenue
 
(2.2
)
 
(2.0
)
 
(2.0
)
 
(1.8
)
Effect of state income taxes, net of federal benefit
 
2.4

 
2.1

 
2.2

 
2.2

Utilization of tax credits:
 
 
 
 
 


 


Low-income housing tax credit, net of amortization
 
(1.1
)
 
(0.9
)
 
(0.9
)
 
(0.5
)
Other tax credits
 
(0.5
)
 
(0.5
)
 
(0.5
)
 
(0.5
)
Bank-owned life insurance
 
(0.7
)
 
(0.7
)
 
(0.7
)
 
(0.7
)
Reduction of tax accrual
 
(1.8
)
 
(2.1
)
 
(0.6
)
 
(0.7
)
Charitable contributions to BOKF Foundation
 
(0.1
)
 
—

 
—

 
(0.1
)
Other, net
 
—

 
(0.2
)
 
0.4

 
0.3

Total
 
31.0
 %
 
30.7
 %
 
32.9
 %
 
33.2
 %