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Investments - Below investment grade securities (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Schedule of Available-for-sale Securities    
Debt securities, amortized cost $ 487,631  
Available-for-sale investment securities 510,401 $ 477,554
Private label residential mortgage backed securities    
Schedule of Available-for-sale Securities    
Debt securities, amortized cost 2,078 $ 2,356
Below investment grade | Private label residential mortgage backed securities    
Schedule of Available-for-sale Securities    
Debt securities, amortized cost $ 1,875