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Fair Value Measurements Financial Instruments not Carried at Fair Value (Details) (USD $)
In Thousands, unless otherwise specified
9 Months Ended 12 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Sep. 30, 2012
Dec. 31, 2011
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Mortgage loans $ 680 $ 1,509    
Policy loans 47,359 42,993    
Short-term investments 0 2,340    
Cash and cash equivalents, at carrying value 41,687 56,299 39,830 33,255
Liability for future policy benefits individual and group annuities 54,178 51,750    
Mortgage loans on real estate, interest rate 6.40% 6.60%    
Mortgage loan maturity lower end range 1 year      
Mortgage loan maturity higher end range 30 years      
Mortgage loans interest rate used to estimate fair value 6.25%      
Insurance policy loans interest rate 7.70% 7.70%    
Fair value minimum interest rate of investment contract 0.33%      
Fair value maximum rate of investment contract 4.19%      
Carrying (Reported) Amount, Fair Value Disclosure [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Fixed maturities held-to-maturity 223,339 187,008    
Mortgage loans 680 1,509    
Policy loans 47,359 42,993    
Short-term investments 0 2,340    
Cash and cash equivalents, at carrying value 41,687 56,299    
Liability for future policy benefits individual and group annuities 54,178 51,750    
Estimate of Fair Value, Fair Value Disclosure [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Fixed maturities held-to-maturity 221,115 193,739    
Mortgage loans 704 1,503    
Policy loans 47,359 42,993    
Short-term investments 0 2,340    
Cash and cash equivalents, fair value disclosure 41,687 56,299    
Liability for future policy benefits individual and group annuities $ 58,196 $ 54,981