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Federal and State Income Taxes Federal and State Income Taxes
 3 Months Ended
Mar. 31, 2018
Income Tax Disclosure [Abstract]  
Income Tax Disclosure [Text Block]
Federal and State Income Taxes

The Tax Cuts and Jobs Act (the "Act") enacted on December 22, 2017, reduced the federal corporate income tax rate from 35% to 21% beginning January 1, 2018. We recognized reasonable estimates of the Act's impact on net deferred tax assets and recorded a provisional adjustment of $9.5 million, including $6.4 million of net deferred tax assets resulting from temporary differences recognized in Accumulated Other Comprehensive Income in 2017. We also recognized a provisional adjustment of $2.2 million for deferred tax assets resulting from executive compensation that may no longer be deductible.

Provisions of the Act are broad and complex, and we continue to evaluate its effect on the Company's financial statements. Results of this evaluation did not significantly impact the Company's financial position or results of operations for the first quarter of 2018.

The reconciliations of income 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,
 
2018
 
2017
Amount:
 
 
 
Federal statutory tax
$
28,622

 
$
44,368

Tax exempt revenue
(1,812
)
 
(3,111
)
Effect of state income taxes, net of federal benefit
3,657

 
2,445

Utilization of tax credits, net of proportional amortization of low-income housing limited partnership investments
(1,333
)
 
(2,087
)
Share-based compensation
(1,620
)
 
(3,937
)
Adjustment to provisional amounts related to tax reform
1,895

 
—

Other, net
1,539

 
425

Total income tax expense
$
30,948

 
$
38,103


 
Three Months Ended
March 31,
 
2018
 
2017
Percent of pretax income:
 
 
 
Federal statutory tax
21.0
 %
 
35.0
 %
Tax exempt revenue
(1.3
)
 
(2.5
)
Effect of state income taxes, net of federal benefit
2.7

 
1.9

Utilization of tax credits, net of proportional amortization of low-income housing limited partnership investments
(1.0
)
 
(1.6
)
Share-based compensation
(1.2
)
 
(3.1
)
Adjustment to provisional amounts related to tax reform
1.4

 
—

Other, net
1.1

 
0.4

Total
22.7
 %
 
30.1
 %