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Securities (Narrative Disclosures) (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
USD ($)
securities
Dec. 31, 2016
USD ($)
securities
Dec. 31, 2015
USD ($)
Investments, Debt and Equity Securities [Abstract]      
Gain on sale of available-for-sale securities | $ $ (403) $ 10 $ 0
Number of available-for-sale securities sold   3  
Available-for-sale securities pledged as collateral | $ $ 2,800 $ 22,400  
Available-for-sale securities in unrealized loss positions 141    
Available-for-sale securities in an unrealized loss position, twelve months or greater 50    
Other than temporary impairment on available-for-sale securities | $ $ 0 0  
Held-to-maturity securities in unrealized loss positions 36    
Held-to-maturity securities in an unrealized loss position, twelve months or greater 16    
Other than temporary impairment on held-to-maturity securities | $ $ 0 $ 0