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Investments (Details 5) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Gross gains resulting from        
Sales of investment securities, gains   $ 3,341 $ 313 $ 3,652
Investment securities called and other, gains 595 387 803 1,250
Sales of real estate 1,010   16,180  
Total gross gains 1,605 3,728 17,296 4,902
Gross losses resulting from        
Available-for-sale Securities, Gross Realized Losses 32 1,590 32 1,590
Gross Losses Resulting from Investment Securities Called and Other 151 125 204 179
Gross Losses Resulting from Mortgage Loans 13   178 3
Gross Realized Losses 196 1,715 414 1,772
Change in allowance for potential future losses on mortgage loans (32)   332  
Amortization of DAC and VOBA (16) (120) (16) (225)
Net realized investment gains, excluding impairment losses 1,361 1,893 17,198 2,905
Net impairment losses recognized in earnings:        
Total other-than-temporary impairment losses (188) (238) (456) (507)
Portion of loss recognized in other comprehensive income 42 56 150 114
Net impairment losses recognized in earnings (146) (182) (306) (393)
Net realized investment gains $ 1,215 $ 1,711 $ 16,892 $ 2,512