Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Premiums:
Life insurance	$ 40,980	$ 42,529
Accident and health insurance	323	291
Property insurance	1,161	1,209
Net investment income	13,796	13,771
Realized investment gains (losses), net	5,961	(575)
Other income	185	208
Total revenue	62,406	57,433
Insurance benefits paid or provided:
Claims and surrenders	23,033	21,151
Increase in future policy benefit reserves	12,299	14,608
Policyholders' dividends	1,182	1,307
Total insurance benefits paid or provided	36,514	37,066
Commissions	7,884	8,959
Other general expenses	14,132	6,507
Capitalization of deferred policy acquisition costs	(4,828)	(5,963)
Amortization of deferred policy acquisition costs	6,277	7,606
Amortization of cost of customer relationships acquired	419	679
Total benefits and expenses	60,398	54,854
Income (loss) before federal income tax	2,008	2,579
Federal income tax expense (benefit)	5,810	2,542
Net income (loss)	(3,802)	37
Unrealized gains (losses) on available-for-sale debt securities:
Unrealized holding gains (losses) arising during period	28,801	(18,098)
Reclassification adjustments for losses (gains) included in net income	104	259
Unrealized gains (losses) on available-for-sale debt securities, net	28,905	(17,839)
Income tax expense (benefit) on unrealized gains (losses) on available-for-sale securities	2,025	(3,735)
Other comprehensive income (loss)	26,880	(14,104)
Comprehensive income (loss)	$ 23,078	$ (14,067)
Common Stock Class A [Member]
Earnings Per Share [Abstract]
Basic and diluted earnings (loss) per share (in dollars per share)	$ (0.08)	$ 0.00
Common Stock Class B [Member]
Earnings Per Share [Abstract]
Basic and diluted earnings (loss) per share (in dollars per share)	$ (0.04)	$ 0.00