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Comprehensive Income (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Unrealized gains/(losses) on securities      
Reclassification adjustments for losses (gains) reclassified into income, net of tax of nil $ (188) $ (10) $ (223)
Accumulated other comprehensive income (loss)      
Beginning balance (2,467)    
Ending balance (1,430) (2,467)  
Parent Company [Member]      
Foreign currency items      
Beginning balance (271) 208  
Other comprehensive income (loss) before reclassifications 862 (479)  
Reclassification adjustments for losses (gains) reclassified into income , net of tax of nil 0 0  
Ending balance 591 (271) 208
Unrealized gains/(losses) on securities      
Beginning balance (353) (238)  
Other comprehensive income (loss) before reclassifications 466 (118)  
Reclassification adjustments for losses (gains) reclassified into income, net of tax of nil (153) 3 (196)
Ending balance (40) (353) (238)
Defined benefit pension plan      
Beginning balance (1,843) (1,849)  
Other comprehensive income (loss) before reclassifications (138) 6  
Reclassification adjustments for losses (gains) reclassified into income, net of tax of nil 0 0  
Ending balance (1,981) (1,843) (1,849)
Accumulated other comprehensive income (loss)      
Beginning balance (2,467) (1,879)  
Other comprehensive income (loss) before reclassifications 1,190 (591)  
Reclassification adjustments for losses (gains) reclassified into income, net of tax of nil (153) 3  
Ending balance $ (1,430) $ (2,467) $ (1,879)