Income Taxes - Summary of Significant Portions of Company's Net Deferred Federal Tax Asset (Liability) (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Operating loss carryforward	$ 3,163	$ 5,859
Other than temporary impairments	974	947
Deferred premiums	846	734
Life policy reserves	821	600
Other	262	380
Deferred reinsurance settlements	555	619
Total deferred tax assets	6,621	9,139
Deferred acquisition costs and sales inducements	2,549	2,147
Net unrealized gains	(229)	1,421
Reinsurance recoverable	648	766
Amortized discount on bonds	94	138
Other	211	143
Fixed assets	(10)	53
Total deferred tax liabilities	3,263	4,668
Net	3,358	4,471
Less valuation allowance	(2,866)	(4,013)
Net deferred tax asset	$ 492	$ 458