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Investment Securities (Unrealized Gain (Loss) on Investments) (Details) - USD ($)
Mar. 31, 2018
Dec. 31, 2017
Schedule of Investments [Line Items]    
Available-for-sale debt securities, Amortized Cost $ 127,384,000 $ 95,648,000
Available-for-sale debt securities, Unrealized Gains 58,000 14,000
Available-for-sale debt securities, Unrealized Losses 5,100,000 2,703,000
Available for sale debt securities, Fair Value 122,342,000 92,959,000
Held-to-maturity debt securities, Amortized Cost 131,293,000 101,356,000
Held-to-maturity debt securities, Unrealized Gains 54,000 41,000
Held-to-maturity debt securities, Unrealized Losses 2,996,000 914,000
Held-to-maturity debt securities, Fair Value 128,352,000 100,483,000
Available-for-sale securities and Held-to-maturity debt securities, Amortized Cost 258,677,000 197,554,000
Available-for-sale securities and Held-to-maturity debt securities, Unrealized Gains 112,000 55,000
Available-for-sale securities and Held-to-maturity debt securities, Unrealized Losses 8,096,000 3,661,000
Available-for-sale securities and Held-to-maturity debt securities, Fair Value 250,694,000 193,948,000
Available-for-sale equity securities, Amortized Cost   550,000
Available-for-sale equity securities, Unrealized Losses   44,000
Available for sale equity securities, Fair Value 496,000 506,000
U.S. Treasury and U.S. government agencies [Member]    
Schedule of Investments [Line Items]    
Available-for-sale debt securities, Amortized Cost 40,604,000 40,125,000
Available-for-sale debt securities, Unrealized Gains 3,000  
Available-for-sale debt securities, Unrealized Losses 2,082,000 1,395,000
Available for sale debt securities, Fair Value 38,525,000 38,730,000
Held-to-maturity debt securities, Amortized Cost 10,984,000 10,984,000
Held-to-maturity debt securities, Unrealized Losses 174,000 90,000
Held-to-maturity debt securities, Fair Value 10,810,000 10,894,000
Mortgage-backed U.S. Government Agencies [Member]    
Schedule of Investments [Line Items]    
Available-for-sale debt securities, Amortized Cost 45,710,000 26,398,000
Available-for-sale debt securities, Unrealized Gains 6,000 2,000
Available-for-sale debt securities, Unrealized Losses 1,077,000 569,000
Available for sale debt securities, Fair Value 44,639,000 25,831,000
Held-to-maturity debt securities, Amortized Cost 69,901,000 53,472,000
Held-to-maturity debt securities, Unrealized Gains 18,000  
Held-to-maturity debt securities, Unrealized Losses 1,345,000 523,000
Held-to-maturity debt securities, Fair Value 68,575,000 52,949,000
State and political subdivision obligations [Member]    
Schedule of Investments [Line Items]    
Available-for-sale debt securities, Amortized Cost 38,222,000 27,775,000
Available-for-sale debt securities, Unrealized Gains 34,000 7,000
Available-for-sale debt securities, Unrealized Losses 1,941,000 739,000
Available for sale debt securities, Fair Value 36,315,000 27,043,000
Held-to-maturity debt securities, Amortized Cost 50,408,000 36,900,000
Held-to-maturity debt securities, Unrealized Gains 36,000 41,000
Held-to-maturity debt securities, Unrealized Losses 1,477,000 301,000
Held-to-maturity debt securities, Fair Value 48,967,000 36,640,000
Corporate debt securities [Member]    
Schedule of Investments [Line Items]    
Available-for-sale debt securities, Amortized Cost 2,848,000 1,350,000
Available-for-sale debt securities, Unrealized Gains 15,000 5,000
Available for sale debt securities, Fair Value $ 2,863,000 1,355,000
Equity Securities [Member]    
Schedule of Investments [Line Items]    
Available-for-sale equity securities, Amortized Cost   550,000
Available-for-sale equity securities, Unrealized Losses   44,000
Available for sale equity securities, Fair Value   $ 506,000