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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, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Current:
Federal									$ 4,005	$ 2,755	$ 5,162
Deferred:
Federal									227	472	29
Federal - impact of enacted changes in tax law											(8)
Total	$ 1,102	$ 933	$ 1,490	$ 707	$ 836	$ 623	$ 932	$ 836	$ 4,232	$ 3,227	$ 5,183

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- Definition

Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.

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