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Nature of Banking Activities and Significant Accounting Policies (Components of Accumulated Other Comprehensive Income, Net of Deferred Taxes) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Organization, Consolidation and Presentation of Financial Statements [Abstract]        
Unrealized Gain (Loss) on Securities, Balance at end of year $ (63) $ 1,012 $ 1,466  
Change in Fair Value of Interest Rate Swap, Balance at end of year 0 0 (190)  
Post Retirement Benefit Plan, Balance at end of year 39 39 39  
Total accumulated other comprehensive income (24) 1,051 1,315 $ 305
Unrealized Gain (Loss) on Securities, Change (1,075) (454) 919  
Change in Fair Value of Interest Rate Swap, Change 0 190    
Post Retirement Benefit Plan, Change 0 0    
Total other comprehensive (loss) income $ (1,075) $ (264) $ 1,010