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Fair Value (Details 2) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Fair value transfers due to changes in available market observable inputs    
Transfers from level 1 to level 2 $ 0 $ 0
Transfers from level 2 to level 1 0 0
Level 3 | Available-for-sale securities    
Roll forward of level 3 fair value measurements on a recurring basis    
Beginning balance 10,079 9,352
Included in earnings (9) (50)
Included in other comprehensive income 12 (25)
Purchases 0 1,871
Sales (493) (1,849)
Transfers into Level 3 2,412 2,185
Transfers out of Level 3 (5,692) (1,681)
Ending balance 6,309 9,803
Level 3 | Corporate debt securities | Available-for-sale securities    
Roll forward of level 3 fair value measurements on a recurring basis    
Beginning balance 7,879 9,352
Included in earnings (9) (50)
Included in other comprehensive income 5 (25)
Purchases 0 1,871
Sales (493) (1,849)
Transfers into Level 3 2,412 2,185
Transfers out of Level 3 (3,485) (1,681)
Ending balance 6,309 $ 9,803
Level 3 | Collateralized debt obligations | Available-for-sale securities    
Roll forward of level 3 fair value measurements on a recurring basis    
Beginning balance 2,200  
Included in earnings 0  
Included in other comprehensive income 7  
Purchases 0  
Sales 0  
Transfers into Level 3 0  
Transfers out of Level 3 (2,207)  
Ending balance $ 0