Statutory Accounting Practices (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Statutory Accounting Practices [Line Items]
Realized investment losses (gains)	$ 2,790,000	$ 669,000
NSIC [Member]
Statutory Accounting Practices [Line Items]
Statutory net income amount	1,425	747
Statutory risk-based adjusted capital	11,092	11,467
Realized investment losses (gains)	1,722,000	441,000
Asset valuation reserve	748,000	1,075,000
NSFC [Member]
Statutory Accounting Practices [Line Items]
Statutory net income amount	874	(2,036)
Statutory risk-based adjusted capital	24,089	25,459
Realized investment losses (gains)	3,259,000	474,000
Intercompany gain on real estate	2,417,000	0
Net realized capital gains after eliminations	842,000
Intercompany gain on real estate, net of tax	1,595,000	0
Investment in Omega One	4,459,000	3,937,000
Omega [Member]
Statutory Accounting Practices [Line Items]
Statutory net income amount	1,157	(2,071)
Statutory risk-based adjusted capital	7,961	7,437
Realized investment losses (gains)	$ 241,000	$ 192,000