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Federal and State Income Taxes Federal and State Income Taxes (Tables) | 3 Months Ended
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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 | %

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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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