Statutory Accounting and Regulation - Equity (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Statutory Accounting Practices [Line Items]
Stockholders' Equity Attributable to Parent	$ 241,327	$ 239,211
Statutory Accounting Practices, GAAP to Statutory, Equity Increase (Decrease) Due to Deferred Policy Acquisition Costs	(15,373)	(9,031)
Statutory Accounting Practices, GAAP to Statutory, Equity Increase (Decrease) Due to Deferred Income Taxes	(3,338)	917
Statutory Accounting Practices, GAAP to Statutory, Equity Increase (Decrease) Due to Investments	1,386	185
Statutory Accounting Practices, GAAP to Statutory, Equity Increase (Decrease) Due to Non-admitted Assets	(623)	(1,066)
Statutory Accounting Practices, GAAP to Statutory, Equity Increase (Decrease) Due to Surplus Debentures	11,176	12,353
Statutory Accounting Practices, GAAP to Statutory, Equity Increase (Decrease) Due to Provision for Reinsurance	(7,648)	(734)
Statutory Accounting Practices, GAAP to Statutory, Equity Increase (Decrease) Due to Non-statutory Subsidiaries	(32,615)	(96,825)
Statutory Accounting Practices, GAAP to Statutory, Equity Increase (Decrease) Due to Commissions	18,570	876
Statutory Accounting Practices, GAAP to Statutory, Equity Increase (Decrease) Due to Prepaid Expenses	(564)	(26)
Statutory Accounting Practices, Statutory to GAAP, Amount of Reconciling Item	0	5,000
Statutory Accounting Practices, Statutory Capital and Surplus, Balance	212,298	150,860
Family Security Holdings (FSH)
Statutory Accounting Practices [Line Items]
Statutory Accounting Practices, Statutory Capital and Surplus, Balance	16,269	15,572
UPC, Subsidiary
Statutory Accounting Practices [Line Items]
Statutory Accounting Practices, Statutory Capital and Surplus, Balance	155,587	$ 135,288
Interboro Insurance Company
Statutory Accounting Practices [Line Items]
Statutory Accounting Practices, Statutory Capital and Surplus, Balance	40,442
Minimum | Family Security Holdings (FSH)
Statutory Accounting Practices [Line Items]
Statutory Accounting Practices, Statutory Capital and Surplus Required	3,250
Minimum | UPC, Subsidiary
Statutory Accounting Practices [Line Items]
Statutory Accounting Practices, Statutory Capital and Surplus Required	5,000
Minimum | Interboro Insurance Company
Statutory Accounting Practices [Line Items]
Statutory Accounting Practices, Statutory Capital and Surplus Required	$ 4,700