Reinsurance (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($) Reinsurer	Dec. 31, 2016 USD ($)
Ceded Credit Risk [Line Items]
Percentage of reinsurance recoverables due from reinsurers	99.00%
Number of reinsurers | Reinsurer	2
Summary reconciliation of premiums written and premiums earned [Abstract]
Direct premiums written	$ 181,568	$ 142,200
Assumed premiums written	19,373	19,123
Ceded premiums written	(38,019)	(10,225)
Net premiums written	162,922	151,098
Direct premiums earned	181,458	144,339
Assumed premiums earned	19,241	19,124
Ceded premiums earned	(37,372)	(9,998)
Net premiums earned	163,327	153,465
Provision for benefits and losses incurred	147,444	109,616
Reinsurance loss recoveries	(29,929)	(6,419)
Total insurance benefits and losses incurred	117,515	103,197
Components of reinsurance recoverables [Abstract]
Recoverable on unpaid losses	11,968	10,796
Recoverable on unpaid benefits	4,403	655
Ceded unearned premiums	874	227
Ceded advanced premiums	368	25
Total reinsurance recoverables	17,613	$ 11,703
Swiss Reinsurance Corporation [Member]
Ceded Credit Risk [Line Items]
Reinsurance recoverables due	60
General Re Life Corporation [Member]
Ceded Credit Risk [Line Items]
Reinsurance recoverables due	$ 17,449