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Investments - Below investment grade securities (Details) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015
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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 |

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