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Investments - Below investment grade securities (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Schedule of Available-for-sale Securities      
Debt securities, amortized cost $ 444,728    
Available-for-sale investment securities 452,842   $ 432,535
Unrealized Gain (Loss) 8,114 $ 8,896  
Private label residential mortgage backed securities      
Schedule of Available-for-sale Securities      
Debt securities, amortized cost 2,473   $ 3,079
Unrealized Gain (Loss) 1,272    
Below investment grade | Private label residential mortgage backed securities      
Schedule of Available-for-sale Securities      
Debt securities, amortized cost $ 2,155