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Fair Value (Details 1) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Changes in the Level 3 fair value category      
Beginning balance   $ 778 $ 779
Net realized/unrealized gains/(losses) included in:      
Other comprehensive income     21
Purchases, issuance, and settlements     (22)
Ending balance     778
Trust preferred securities      
Changes in the Level 3 fair value category      
Beginning balance $ 825 778  
Net realized/unrealized gains/(losses) included in:      
Other comprehensive income 72 67  
Purchases, issuance, and settlements (2) (20)  
Ending balance $ 895 $ 825 $ 778