Insurance Reserves and Policyholder Funds, Incurred Paid Claims Reconciliation (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Net Outstanding Liabilities [Abstract]
Liabilities for unpaid claims and claim adjustment expenses, net of reinsurance	$ 51,995
Reinsurance Recoverable on Unpaid Claims [Abstract]
Total reinsurance recoverable on unpaid losses	11,968	$ 10,796
Unallocated claims adjustment expenses	1,726
Total gross liability for unpaid losses, claims and loss adjustment expenses	65,689	$ 62,562	$ 63,870
Medicare Supplement Insurance [Member]
Net Outstanding Liabilities [Abstract]
Liabilities for unpaid claims and claim adjustment expenses, net of reinsurance	10,368
Reinsurance Recoverable on Unpaid Claims [Abstract]
Total reinsurance recoverable on unpaid losses	4,748
Automobile Liability [Member]
Net Outstanding Liabilities [Abstract]
Liabilities for unpaid claims and claim adjustment expenses, net of reinsurance	31,450
Reinsurance Recoverable on Unpaid Claims [Abstract]
Total reinsurance recoverable on unpaid losses	5,245
Automobile Physical Damage [Member]
Net Outstanding Liabilities [Abstract]
Liabilities for unpaid claims and claim adjustment expenses, net of reinsurance	1,110
Reinsurance Recoverable on Unpaid Claims [Abstract]
Total reinsurance recoverable on unpaid losses	116
General Liability [Member]
Net Outstanding Liabilities [Abstract]
Liabilities for unpaid claims and claim adjustment expenses, net of reinsurance	3,902
Reinsurance Recoverable on Unpaid Claims [Abstract]
Total reinsurance recoverable on unpaid losses	1,859
Surety [Member]
Net Outstanding Liabilities [Abstract]
Liabilities for unpaid claims and claim adjustment expenses, net of reinsurance	3,161
Other Short-Duration Insurance Lines [Member]
Net Outstanding Liabilities [Abstract]
Liabilities for unpaid claims and claim adjustment expenses, net of reinsurance	$ 2,004