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v3.19.1

Federal and State Income Taxes Federal and State Income Taxes (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Effective Income Tax Rate Reconciliation, Amount [Abstract] |  |  |  |
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) |  |
Adjustment to provisional amounts related to tax reform | 0 | 1,895 |  |
Other, net | 1,548 | 1,664 |  |
Total income tax expense | $ 29,950 | $ 30,948 |  |
Effective Income Tax Rate Reconciliation, Percent [Abstract] |  |  |  |
Federal statutory tax (in hundredths) | 21.00% | 21.00% | 21.00% | 35.00%
Tax exempt revenue (in hundredths) | (2.00%) | (1.30%) |  |
Effect of state income taxes, net of federal benefit (in hundredths) | 2.70% | 2.70% |  |
Utilization of tax credits, net of proportional amortization of low-income housing limited partnership investments (in hundredths) | (1.10%) | (1.10%) |  |
Share-based compensation (in hundredths) | (0.40%) | (1.20%) |  |
Adjustment to provisional amounts related to tax reform (in hundredths) | 0.00% | 1.40% |  |
Other, net (in hundredths) | 1.20% | 1.20% |  |
Total (in hundredths) | 21.40% | 22.70% |  |

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