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Income Taxes - Summary of Reconciliation of Statutory Federal Tax and Effective Income Tax Rates (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Reconciliation of Effective Income Tax Rates Continuing Operations |  |  |  |
Federal income tax expense (1) | [1] | $ 16,291 | $ 25,351 | $ 22,759
State income taxes, net of federal benefit |  | 4,088 | 1,894 | 3,422
ESOP dividend deduction |  | (158) | (257) | (264)
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount |  | 0 | (14,299) | 0
Other |  | 773 | 1,620 | 2,424
Total Income Tax Expense |  | $ 20,994 | $ 14,309 | $ 28,341
Effective Income Tax Rate (2) | [2] | 27.06% | 19.75% | 38.81%
[1] | Federal income taxes were calculated at 21 percent for 2018 and 35 percent for 2017 and 2016.
[2] | Effective tax rate 2017 includes the impact of the revaluation of deferred tax assets and liabilities for our unregulated businesses due to implementation of the TCJA

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