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Securities (Narrative Disclosures) (Details)
 6 Months Ended
Jun. 30, 2017
USD ($)
securities
Jun. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Investments, Debt and Equity Securities [Abstract]      
Number of available-for-sale securities sold | $ $ 6 $ 3  
Available-for-sale securities pledged as collateral | $ $ 18,900,000   $ 22,400,000
Number of available-for-sales securities in an unrealized loss position | securities 123    
Number of available-for-sale securities in an unrealized loss position, twelve months or greater | securities 16    
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 | securities 17    
Number of held-to-maturity Securities in an unrealized loss position, twelve months or greater | securities 5    
Other than temporary impairment on held-to-maturity securities recorded on the income statement | $ $ 0 $ 0