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Investment Securities (Unrealized Gain (Loss) on Investments) (Details) - USD ($) | Sep. 30, 2018 | Dec. 31, 2017
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Schedule of Investments [Line Items] |  |
Available-for-sale debt securities, Amortized Cost | $ 116,823,000 | $ 95,648,000
Available-for-sale debt securities, Unrealized Gains | 54,000 | 14,000
Available-for-sale debt securities, Unrealized Losses | 6,350,000 | 2,703,000
Available for sale debt securities, Fair Value | 110,527,000 | 92,959,000
Held-to-maturity debt securities, Amortized Cost | 171,521,000 | 101,356,000
Held-to-maturity debt securities, Unrealized Gains | 26,000 | 41,000
Held-to-maturity debt securities, Unrealized Losses | 4,427,000 | 914,000
Held-to-maturity debt securities, Fair Value | 167,120,000 | 100,483,000
Available-for-sale securities and Held-to-maturity debt securities, Amortized Cost | 288,344,000 | 197,554,000
Available-for-sale securities and Held-to-maturity debt securities, Unrealized Gains | 80,000 | 55,000
Available-for-sale securities and Held-to-maturity debt securities, Unrealized Losses | 10,777,000 | 3,661,000
Available-for-sale securities and Held-to-maturity debt securities, Fair Value | 277,647,000 | 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 | 488,000 | 506,000
U.S. Treasury and U.S. government agencies [Member] |  |
Schedule of Investments [Line Items] |  |
Available-for-sale debt securities, Amortized Cost | 40,590,000 | 40,125,000
Available-for-sale debt securities, Unrealized Losses | 2,640,000 | 1,395,000
Available for sale debt securities, Fair Value | 37,950,000 | 38,730,000
Held-to-maturity debt securities, Amortized Cost | 16,480,000 | 10,984,000
Held-to-maturity debt securities, Unrealized Gains | 5,000 |
Held-to-maturity debt securities, Unrealized Losses | 261,000 | 90,000
Held-to-maturity debt securities, Fair Value | 16,224,000 | 10,894,000
Mortgage-backed U.S. Government Agencies [Member] |  |
Schedule of Investments [Line Items] |  |
Available-for-sale debt securities, Amortized Cost | 41,677,000 | 26,398,000
Available-for-sale debt securities, Unrealized Gains |  | 2,000
Available-for-sale debt securities, Unrealized Losses | 1,490,000 | 569,000
Available for sale debt securities, Fair Value | 40,187,000 | 25,831,000
Held-to-maturity debt securities, Amortized Cost | 69,344,000 | 53,472,000
Held-to-maturity debt securities, Unrealized Gains | 2,000 |
Held-to-maturity debt securities, Unrealized Losses | 1,998,000 | 523,000
Held-to-maturity debt securities, Fair Value | 67,348,000 | 52,949,000
State and political subdivision obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Available-for-sale debt securities, Amortized Cost | 33,306,000 | 27,775,000
Available-for-sale debt securities, Unrealized Gains | 54,000 | 7,000
Available-for-sale debt securities, Unrealized Losses | 2,213,000 | 739,000
Available for sale debt securities, Fair Value | 31,147,000 | 27,043,000
Held-to-maturity debt securities, Amortized Cost | 84,154,000 | 36,900,000
Held-to-maturity debt securities, Unrealized Gains | 19,000 | 41,000
Held-to-maturity debt securities, Unrealized Losses | 2,157,000 | 301,000
Held-to-maturity debt securities, Fair Value | 82,016,000 | 36,640,000
Corporate debt securities [Member] |  |
Schedule of Investments [Line Items] |  |
Available-for-sale debt securities, Amortized Cost | 1,250,000 | 1,350,000
Available-for-sale debt securities, Unrealized Gains |  | 5,000
Available-for-sale debt securities, Unrealized Losses | 7,000 |
Available for sale debt securities, Fair Value | 1,243,000 | 1,355,000
Held-to-maturity debt securities, Amortized Cost | 1,543,000 |
Held-to-maturity debt securities, Unrealized Losses | 11,000 |
Held-to-maturity debt securities, Fair Value | 1,532,000 |
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 | $ 488,000 | $ 506,000

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