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Federal and State Income Taxes
 9 Months Ended
Sep. 30, 2013
Effective Income Tax Rate Reconciliation, Percent [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
 
Nine Months Ended
 
 
September 30,
 
September 30,
 
 
2013
 
2012
 
2013
 
2012
Amount:
 
 
 
 
 
 
 
 
Federal statutory tax
 
$
38,333

 
$
46,771

 
$
128,446

 
$
145,234

Tax exempt revenue
 
(1,860
)
 
(1,398
)
 
(5,405
)
 
(3,996
)
Effect of state income taxes, net of federal benefit
 
2,072

 
3,640

 
8,572

 
10,210

Utilization of tax credits
 
(1,669
)
 
(718
)
 
(5,217
)
 
(3,282
)
Bank-owned life insurance
 
(871
)
 
(931
)
 
(2,749
)
 
(2,886
)
Reduction of tax accrual
 
(1,400
)
 
(950
)
 
(1,400
)
 
(950
)
Charitable Contribution to BOKF Foundation
 
(1,115
)
 
—

 
(1,115
)
 
—

Other, net
 
(29
)
 
(636
)
 
848

 
117

Total
 
$
33,461

 
$
45,778

 
$
121,980

 
$
144,447


 
 
Three Months Ended
 
Nine Months Ended
 
 
September 30,
 
September 30,
 
 
2013
 
2012
 
2013
 
2012
Percent of pretax income:
 
 
 
 
 
 
 
 
Federal statutory tax
 
35
 %
 
35
 %
 
35
 %
 
35
 %
Tax exempt revenue
 
(2
)
 
(1
)
 
(1
)
 
(1
)
Effect of state income taxes, net of federal benefit
 
2

 
3

 
2

 
2

Utilization of tax credits
 
(1
)
 
(1
)
 
(1
)
 
(1
)
Bank-owned life insurance
 
(1
)
 
(1
)
 
(1
)
 
(1
)
Reduction of tax accrual
 
(1
)
 
(1
)
 
(1
)
 
—

Charitable Contribution to BOKF Foundation
 
(1
)
 
—

 
—

 
—

Other, net
 
—

 
—

 
—

 
1

Total
 
31
 %
 
34
 %
 
33
 %
 
35
 %