Reinsurance (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Maximum Retention of Life Insurance Face Amount	$ 100,000	$ 100,000
Reinsurance Retention Policy, Reinsured Risk, Percentage	100.00%
Percentage Amount of Coinsurance for Accident and Health Insurance Reinsurance	100.00%
Reinsurance Recoverable on Claims Payable and Future Policy Benefit Reserves for a specific reinsurer	$ 27,000
Reinsurance Recoverable on Claims Payable and Future Policy Benefit Reserves	3,715,000	3,862,000
Maximum Amount of Casualty Reinsurance for First Catastrophe	10,000,000	10,000,000
Maximum Amount of Casualty Reinsurance for Second Catastrophy	10,000,000
Reinsurance Deductible for First Catastrophe	500,000	500,000
Reinsurance Deductible for Second Catastrophy	500,000
Assumed Premiums, Life Insurance in Force	5,564,000	22,915,000	$ 36,766,000
Aggregate ceded life insurance in force	(503,685,000)	(522,821,000)	(516,933,000)
Premiums, Net, Life Insurance in Force	4,469,735,000	4,497,735,000	4,478,202,000
Direct Premiums Earned	200,711,000	201,074,000	197,337,000
Assumed Premiums Earned	142,000	151,000	353,000
Ceded Premiums Earned	3,133,000	3,349,000	3,210,000
Net reinsurance premiums earned	191,342,000	191,254,000	187,686,000
Premiums Earned, Net	197,720,000	197,876,000	194,480,000
Claims and surrenders assumed	247,000	237,000	414,000
Claims and surrenders ceded	(946,000)	(877,000)	(1,013,000)
Payments for Reinsurance	800,000	828,000	873,000
Life and Accident & Health Product Lines [Member]
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Direct Premiums Earned	193,778,000	194,147,000	190,114,000
Assumed Premiums Earned	142,000	151,000	353,000
Ceded Premiums Earned	(2,352,000)	(2,521,000)	(2,337,000)
Net reinsurance premiums earned	191,568,000	191,777,000	188,130,000
Property and Casualty, Personal Insurance Product Line [Member]
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Direct Premiums Earned	6,933,000	6,927,000	7,223,000
Assumed Premiums Earned	0	0	0
Ceded Premiums Earned	(781,000)	(828,000)	(873,000)
Net reinsurance premiums earned	$ 6,152,000	$ 6,099,000	$ 6,350,000