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Investments - Below investment grade securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Schedule of Available-for-sale Securities    
Debt securities, amortized cost $ 533,044  
Available-for-sale investment securities 551,075 $ 477,554
Private label residential mortgage backed securities    
Schedule of Available-for-sale Securities    
Debt securities, amortized cost 1,895 $ 2,356
Below investment grade | Private label residential mortgage backed securities    
Schedule of Available-for-sale Securities    
Debt securities, amortized cost $ 1,711