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Federal and State Income Taxes Federal and State Income Taxes | 3 Months Ended
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Mar. 31, 2019
Income Tax Disclosure [Abstract] |
Income Tax Disclosure [Text Block] | Federal and State Income Taxes The Tax Cuts and Jobs Act (the "Tax Reform Act") enacted on December 22, 2017, reduced the federal corporate income tax rate from 35% to 21% beginning January 1, 2018. We completed our accounting during 2018 for uncertainties that resulted from the Tax Reform Act. Adjustments to provisional amounts related to the Tax Reform Act were recognized during 2018. 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 The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -URI http://asc.fasb.org/topic&trid=2144680 + Details
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