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Fair Value (Details 2) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Fair value transfers due to changes in available market observable inputs        
Transfers from level 1 to level 2 $ 0 $ 0 $ 0 $ 0
Transfers from level 2 to level 1 0 0 0 0
Level 3 | Available-for-sale securities        
Roll forward of level 3 fair value measurements on a recurring basis        
Beginning balance 6,309 9,803 10,079 9,352
Included in earnings 10 29 1 (21)
Included in other comprehensive income (53) (23) (41) (48)
Purchases 3,047 2,110 3,047 3,981
Sales (472) (1,283) (965) (3,132)
Transfers into Level 3 5,370 3,626 7,782 5,811
Transfers out of Level 3 (3,091) (4,967) (8,783) (6,648)
Ending balance 11,120 9,295 11,120 9,295
Level 3 | Corporate debt securities | Available-for-sale securities        
Roll forward of level 3 fair value measurements on a recurring basis        
Beginning balance 6,309 9,803 7,879 9,352
Included in earnings 10 29 1 (21)
Included in other comprehensive income (53) (23) (48) (48)
Purchases 3,047 2,110 3,047 3,981
Sales (472) (1,283) (965) (3,132)
Transfers into Level 3 5,370 3,626 7,782 5,811
Transfers out of Level 3 (3,091) (4,967) (6,576) (6,648)
Ending balance 11,120 $ 9,295 11,120 $ 9,295
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   $ 0