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Investment Securities (Unrealized Gain (Loss) on Investments) (Details) - USD ($) | Mar. 31, 2018 | Dec. 31, 2017
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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

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