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Federal Income Taxes - Components of Income Tax Expense (Benefit) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Current: |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  |  |  |  | $ 5,162 | $ 4,601 | $ 3,941
Deferred: |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  |  |  |  | 29 | 55 | (122)
Federal - impact of enacted changes in tax law |  |  |  |  |  |  |  |  | (8) |  |
Total | $ 1,583 | $ 1,159 | $ 1,298 | $ 1,143 | $ 1,307 | $ 1,161 | $ 1,254 | $ 934 | $ 5,183 | $ 4,656 | $ 3,819

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