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Securities (Narrative Disclosures) (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
USD ($)
securities
Mar. 31, 2017
USD ($)
securities
Dec. 31, 2017
USD ($)
Investments, Debt and Equity Securities [Abstract]      
Number of available-for-sale securities sold 0 0  
Available-for-sale securities pledged as collateral | $ $ 2,600   $ 2,800
Number of available-for-sales securities in an unrealized loss position 158    
Number of available-for-sale securities in an unrealized loss position, twelve months or greater 49    
Other than temporary impairment on available-for-sale securities recorded on the income statement | $ $ 0 $ 0  
Number of held-to-maturity securities in an unrealized loss position 81    
Number of held-to-maturity Securities in an unrealized loss position, twelve months or greater 16    
Other than temporary impairment on held-to-maturity securities recorded on the income statement | $ $ 0 $ 0