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Investment Securities (Unrealized Gain (Loss) on Investments) (Details) - USD ($)
Sep. 30, 2017
Dec. 31, 2016
Schedule of Investments [Line Items]    
Available-for-sale securities, Amortized Cost $ 98,164,000 $ 138,048,000
Available-for-sale securities, Unrealized Gains 53,000 142,000
Available-for-sale securities, Unrealized Losses 1,704,000 4,565,000
Available for sale Securities, Fair Value 96,513,000 133,625,000
Held-to-maturity securities, Amortized Cost 82,625,000 0
Held-to-maturity securities, Unrealized Gains 241,000  
Held-to-maturity securities, Unrealized Losses 150,000  
Held-to-maturity securities, Fair Value 82,716,000 0
Available-for-sale securities and Held-to-maturity securities, Amortized Cost 180,789,000  
Available-for-sale securities and Held-to-maturity securities, Unrealized Gains 294,000  
Available-for-sale securities and Held-to-maturity securities, Unrealized Losses 1,854,000  
Available-for-sale securities and Held-to-maturity securities, Fair Value 179,229,000  
U.S. Treasury and U.S. government agencies [Member]    
Schedule of Investments [Line Items]    
Available-for-sale securities, Amortized Cost 40,133,000 48,520,000
Available-for-sale securities, Unrealized Gains   34,000
Available-for-sale securities, Unrealized Losses 880,000 1,542,000
Available for sale Securities, Fair Value 39,253,000 47,012,000
Held-to-maturity securities, Amortized Cost 10,984,000  
Held-to-maturity securities, Unrealized Gains 21,000  
Held-to-maturity securities, Unrealized Losses 7,000  
Held-to-maturity securities, Fair Value 10,998,000  
Mortgage-backed U.S. Government Agencies [Member]    
Schedule of Investments [Line Items]    
Available-for-sale securities, Amortized Cost 27,370,000 26,181,000
Available-for-sale securities, Unrealized Gains 11,000 17,000
Available-for-sale securities, Unrealized Losses 335,000 579,000
Available for sale Securities, Fair Value 27,046,000 25,619,000
Held-to-maturity securities, Amortized Cost 51,326,000  
Held-to-maturity securities, Unrealized Gains 96,000  
Held-to-maturity securities, Unrealized Losses 102,000  
Held-to-maturity securities, Fair Value 51,320,000  
State and political subdivision obligations [Member]    
Schedule of Investments [Line Items]    
Available-for-sale securities, Amortized Cost 28,393,000 61,079,000
Available-for-sale securities, Unrealized Gains 35,000 91,000
Available-for-sale securities, Unrealized Losses 450,000 2,332,000
Available for sale Securities, Fair Value 27,978,000 58,838,000
Held-to-maturity securities, Amortized Cost 20,315,000  
Held-to-maturity securities, Unrealized Gains 124,000  
Held-to-maturity securities, Unrealized Losses 41,000  
Held-to-maturity securities, Fair Value 20,398,000  
Corporate debt securities [Member]    
Schedule of Investments [Line Items]    
Available-for-sale securities, Amortized Cost 1,000,000 1,100,000
Available-for-sale securities, Unrealized Gains 5,000  
Available for sale Securities, Fair Value 1,005,000 1,100,000
Equity Securities [Member]    
Schedule of Investments [Line Items]    
Available-for-sale securities, Amortized Cost 1,268,000 1,168,000
Available-for-sale securities, Unrealized Gains 2,000  
Available-for-sale securities, Unrealized Losses 39,000 112,000
Available for sale Securities, Fair Value $ 1,231,000 $ 1,056,000