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Security Types (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
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Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Debt Maturities, within One Year, Fair Value | $ 0 | $ 0
Available-for-sale Securities, Debt Maturities, after One Through Five Years, Fair Value | 32,447 | 31,817
Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Fair Value | 40,525 | 45,009
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value | 186,205 | 180,871
Available-for-sale Securities, Fair Value, Total | 259,177 | 257,697
Available For Sale Securities, Gross Unrealized Gains | 1,026 | 2,025
Available For Sale Securities, Gross Unrealized Losses | 5,948 | 2,780
Available-for-sale Securities, Amortized Cost Basis | 264,099 | 258,452
US Government and Government Agencies and Authorities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Debt Maturities, within One Year, Fair Value | 0 | 0
Available-for-sale Securities, Debt Maturities, after One Through Five Years, Fair Value | 29,027 | 29,253
Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Fair Value | 22,654 | 23,809
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value | 0 | 0
Available-for-sale Securities, Fair Value, Total | 51,681 | 53,062
Available For Sale Securities, Gross Unrealized Gains | 6 | 79
Available For Sale Securities, Gross Unrealized Losses | 1,399 | 904
Available-for-sale Securities, Amortized Cost Basis | 53,074 | 53,887
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Debt Maturities, within One Year, Fair Value | 0 | 0
Available-for-sale Securities, Debt Maturities, after One Through Five Years, Fair Value | 0 | 0
Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Fair Value | 10,356 | 11,201
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value | 125,437 | 121,871
Available-for-sale Securities, Fair Value, Total | 135,793 | 133,072
Available For Sale Securities, Gross Unrealized Gains | 137 | 330
Available For Sale Securities, Gross Unrealized Losses | 3,871 | 1,639
Available-for-sale Securities, Amortized Cost Basis | 139,527 | 134,381
US States and Political Subdivisions Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Debt Maturities, within One Year, Fair Value | 0 | 0
Available-for-sale Securities, Debt Maturities, after One Through Five Years, Fair Value | 3,420 | 2,564
Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Fair Value | 7,515 | 9,999
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value | 60,768 | 59,000
Available-for-sale Securities, Fair Value, Total | 71,703 | 71,563
Available For Sale Securities, Gross Unrealized Gains | 883 | 1,616
Available For Sale Securities, Gross Unrealized Losses | 678 | 237
Available-for-sale Securities, Amortized Cost Basis | $ 71,498 | $ 70,184

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