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Investments Other Than Temporary Impairments by Asset Type (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Securities
Jun. 30, 2012
Investment Holdings [Line Items]        
Other Than Temporary Impairment, Number of Securities     9  
Other than Temporary Impairment Losses, Investments     $ (4,964)  
Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent 0 (603) (1,048) (1,703)
Net OTTI losses recognized in operations (2,775) (978) (6,012) (3,859)
US Government Agencies Debt Securities [Member]
        
Investment Holdings [Line Items]        
Other Than Temporary Impairment, Number of Securities 2   2  
Other than Temporary Impairment Losses, Investments (2,775)   (2,775)  
Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent 0   0  
Net OTTI losses recognized in operations (2,775)   (2,775)  
Residential Mortgage Backed Securities [Member]
        
Investment Holdings [Line Items]        
Other Than Temporary Impairment, Number of Securities   7 5 22
Other than Temporary Impairment Losses, Investments   (375) 0 (2,156)
Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent   (603) (1,048) (1,703)
Net OTTI losses recognized in operations   (978) (1,048) (3,859)
Equity Securities [Member]
        
Investment Holdings [Line Items]        
Other Than Temporary Impairment, Number of Securities     1  
Other than Temporary Impairment Losses, Investments     (428)  
Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent     0  
Net OTTI losses recognized in operations     (428)  
Corporate Debt Securities, Manufacturing, Construction, and Mining Sectors [Member]
        
Investment Holdings [Line Items]        
Other Than Temporary Impairment, Number of Securities     1  
Other than Temporary Impairment Losses, Investments     (1,761)  
Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent     0  
Net OTTI losses recognized in operations     $ (1,761)