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Federal and State Income Taxes Federal and State Income Taxes (Tables)
 3 Months Ended
Mar. 31, 2019
Income Tax Disclosure [Abstract]  
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] The reconciliation 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,
 
2019
 
2018
Amount:
 
 
 
Federal statutory tax
$
29,445

 
$
28,622

Tax exempt revenue
(2,757
)
 
(1,812
)
Effect of state income taxes, net of federal benefit
3,851

 
3,657

Utilization of tax credits, net of proportional amortization of low-income housing limited partnership investments
(1,608
)
 
(1,458
)
Share-based compensation
(529
)
 
(1,620
)
Implementation of Tax Reform Act
—

 
1,895

Other, net
1,548

 
1,664

Total income tax expense
$
29,950

 
$
30,948


 
Three Months Ended
March 31,
 
2019
 
2018
Percent of pretax income:
 
 
 
Federal statutory tax
21.0
 %
 
21.0
 %
Tax exempt revenue
(2.0
)
 
(1.3
)
Effect of state income taxes, net of federal benefit
2.7

 
2.7

Utilization of tax credits, net of proportional amortization of low-income housing limited partnership investments
(1.1
)
 
(1.1
)
Share-based compensation
(0.4
)
 
(1.2
)
Implementation of Tax Reform Act
—

 
1.4

Other, net
1.2

 
1.2

Total
21.4
 %
 
22.7
 %