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Securities (Narrative) (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
security
Dec. 31, 2016
USD ($)
security
Dec. 31, 2015
USD ($)
Available-for-sale Securities [Abstract]      
Sales and calls of securities available for sale $ 20,283 $ 11,356 $ 3,653
Available-for-sale Securities, Gross Realized Gain (Loss) 94 108 $ 124
Available-for-sale Securities, Gross Realized Losses $ 104 $ 10  
Debt securities included in gross unrealized losses on available for sale securities | security 54 80  
Carrying value of securities pledged as collateral $ 2,600