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Investments (Details 2) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Other Investments    
Other investments $ 36,459 $ 31,085
Investments in LPs/LLCs, at cost [Member]
   
Other Investments    
Other investments 31,495 25,092
FHLB capital stock, at cost [Member]
   
Other Investments    
Other investments 3,449 4,278
Other, principally an annuity, at amortized cost [Member]
   
Other Investments    
Other investments $ 1,515 $ 1,715