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Federal Income Taxes - Reconciliation of the Statutory Federal Income Tax Rate to the Effective Tax Rate (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
Income Tax Expense Benefit Continuing Operations Income Tax Reconciliation [Abstract]
Income tax at statutory rates									$ 3,758	$ 6,045	$ 5,521
Decrease resulting from:
Tax exempt interest									(220)	(413)	(468)
Adjustment of deferred taxes for enacted changes in tax law										(8)
Section 831 deduction									(236)	(318)	(351)
Change in other									(75)	(123)	(46)
Total	$ 836	$ 623	$ 932	$ 836	$ 1,583	$ 1,159	$ 1,298	$ 1,143	$ 3,227	$ 5,183	$ 4,656

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Income Tax Expense Benefit Continuing Operations Increase Decrease By Items Reconciliation [Abstract]

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations, attributable to increase (decrease) in the income tax rates.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to deductions. Including, but not limited to, extraterritorial income exclusion deduction, qualified production activity deduction, dividend deduction, deduction for dividend paid to employee stock ownership plan, Medicare prescription drug benefit subsidy deduction, and other deductions.

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