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Fair Value (Details 2) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 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 11,120 9,295 10,079 9,352
Included in earnings 3 24 4 3
Included in other comprehensive income 71 (60) 30 (108)
Purchases 2,444 539 5,491 4,520
Sales (1,416) (1,240) (2,381) (4,372)
Transfers into Level 3 2,735 2,633 10,517 8,444
Transfers out of Level 3 (5,782) (3,276) (14,565) (9,924)
Ending balance 9,175 7,915 9,175 7,915
Level 3 | Corporate debt securities | Available-for-sale securities        
Roll forward of level 3 fair value measurements on a recurring basis        
Beginning balance 11,120 9,295 7,879 9,352
Included in earnings 3 24 4 3
Included in other comprehensive income 71 (60) 23 (108)
Purchases 1,539 539 4,586 4,520
Sales (1,416) (1,240) (2,381) (4,372)
Transfers into Level 3 2,735 2,633 10,517 8,444
Transfers out of Level 3 (5,782) (3,276) (12,358) (9,924)
Ending balance 8,270 $ 7,915 8,270 $ 7,915
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  
Level 3 | Other debt securities | Available-for-sale securities        
Roll forward of level 3 fair value measurements on a recurring basis        
Beginning balance 0   0  
Included in earnings 0   0  
Included in other comprehensive income 0   0  
Purchases 905   905  
Sales 0   0  
Transfers into Level 3 0   0  
Transfers out of Level 3 0   0  
Ending balance $ 905   $ 905