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Federal and State Income Taxes Federal and State Income Taxes (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Effective Income Tax Rate Reconciliation, Amount [Abstract] |  |  |  |  |
Federal statutory tax | $ 31,963 | $ 44,880 | $ 91,767 | $ 137,048 |
Tax exempt revenue | (2,059) | (3,001) | (5,524) | (9,336) |
Effect of state income taxes, net of federal benefit | 3,740 | 2,486 | 10,685 | 7,875 |
Utilization of tax credits, net of proportional amortization of low-income housing limited partnership investments | 56 | (387) | (2,611) | (3,363) |
Effective Income Tax Rate Reconciliation, Share-based Compensation, Excess Tax Benefit, Amount | (26) | (169) | (2,070) | (2,470) |
Adjustment to provisional amounts related to tax reform | 0 | 0 | 1,895 | 0 |
Other, net | 988 | (1,371) | 4,798 | (1,508) |
Total income tax expense | $ 34,662 | $ 42,438 | $ 98,940 | $ 128,246 |
Effective Income Tax Rate Reconciliation, Percent [Abstract] |  |  |  |  |
Federal statutory tax (in hundredths) | 21.00% | 35.00% | 21.00% | 35.00% | 35.00%
Tax exempt revenue (in hundredths) | (1.40%) | (2.30%) | (1.30%) | (2.40%) |
Effect of state income taxes, net of federal benefit (in hundredths) | 2.50% | 1.90% | 2.40% | 2.00% |
Utilization of tax credits, net of proportional amortization of low-income housing limited partnership investments (in hundredths) | 0.00% | (0.30%) | (0.60%) | (0.90%) |
Share-based compensation (in hundredths) | 0.00% | (0.10%) | (0.50%) | (0.60%) |
Adjustment to provisional amounts related to tax reform (in hundredths) | 0.00% | 0.00% | 0.40% | 0.00% |
Other, net (in hundredths) | 0.70% | (1.10%) | 1.20% | (0.30%) |
Total (in hundredths) | 22.80% | 33.10% | 22.60% | 32.80% |

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