Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Premiums:
Life insurance	$ 48,644	$ 47,513	$ 138,603	$ 137,637
Accident and health insurance	360	385	1,033	1,170
Property insurance	1,243	1,274	3,731	3,811
Net investment income	13,828	12,320	39,640	36,051
Realized investment gains (losses), net	(404)	46	742	(1,776)
Other income	660	203	1,015	610
Total revenue	64,331	61,741	184,764	177,503
Insurance benefits paid or provided:
Claims and surrenders	21,454	21,014	62,130	60,988
Increase in future policy benefit reserves	19,597	18,997	51,953	52,095
Policyholders' dividends	1,613	1,620	4,418	4,985
Total insurance benefits paid or provided	42,664	41,631	118,501	118,068
Commissions	10,801	10,852	30,620	31,097
Other general expenses	7,254	4,992	26,765	22,732
Deferred Policy Acquisition Costs, Capitalized Amount	(7,756)	(7,890)	(21,540)	(22,257)
Amortization of deferred policy acquisition costs	7,623	6,908	22,640	20,418
Amortization of cost of customer relationships acquired	635	641	1,629	1,588
Total benefits and expenses	61,221	57,134	178,615	171,646
Income before federal income tax	3,110	4,607	6,149	5,857
Federal income tax expense	(339)	1,845	72	4,004
Net income	3,449	2,762	6,077	1,853
Unrealized gains on available-for-sale securities:
Unrealized holding gains arising during period	3,875	(1,261)	13,585	26,446
Reclassification adjustments for losses included in net income	370	(47)	329	1,769
Unrealized gains on available-for-sale securities, net	4,245	(1,308)	13,914	28,215
Income tax expense on unrealized gains (losses) on available-for-sale securities	1,486	(458)	4,870	9,875
Other comprehensive income	2,759	(850)	9,044	18,340
Comprehensive income	$ 6,208	$ 1,912	$ 15,121	$ 20,193
Common Stock Class A [Member]
Earnings Per Share [Abstract]
Basic earnings per share (in dollars per share)	$ 0.07	$ 0.06	$ 0.12	$ 0.04
Diluted earnings per share (in dollars per share)	0.07	0.06	0.12	0.04
Common Stock Class B [Member]
Earnings Per Share [Abstract]
Basic earnings per share (in dollars per share)	0.03	0.03	0.06	0.02
Diluted earnings per share (in dollars per share)	$ 0.03	$ 0.03	$ 0.06	$ 0.02