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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, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Current: |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  |  |  |  | $ 2,755 | $ 5,162 | $ 4,601
Deferred: |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  |  |  |  | 472 | 29 | 55
Federal - impact of enacted changes in tax law |  |  |  |  |  |  |  |  |  | (8) |
Total | $ 836 | $ 623 | $ 932 | $ 836 | $ 1,583 | $ 1,159 | $ 1,298 | $ 1,143 | $ 3,227 | $ 5,183 | $ 4,656

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