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Security Types (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Debt Maturities, within One Year, Fair Value | $ 0 | $ 3,047
Available-for-sale Securities, Debt Maturities, after One Through Five Years, Fair Value | 31,593 | 25,983
Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Fair Value | 46,753 | 46,274
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value | 186,825 | 168,268
Available-for-sale Securities, Fair Value, Total | 265,171 | 243,572
Available For Sale Securities, Gross Unrealized Gains | 2,416 | 2,391
Available For Sale Securities, Gross Unrealized Losses | 2,191 | 3,512
Available-for-sale Securities, Amortized Cost Basis | 264,946 | 244,693
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 | 3,047
Available-for-sale Securities, Debt Maturities, after One Through Five Years, Fair Value | 29,496 | 22,531
Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Fair Value | 24,009 | 19,893
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value | 0 | 0
Available-for-sale Securities, Fair Value, Total | 53,505 | 45,471
Available For Sale Securities, Gross Unrealized Gains | 230 | 331
Available For Sale Securities, Gross Unrealized Losses | 654 | 973
Available-for-sale Securities, Amortized Cost Basis | 53,929 | 46,113
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 | 972
Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Fair Value | 12,028 | 16,171
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value | 127,778 | 110,644
Available-for-sale Securities, Fair Value, Total | 139,806 | 127,787
Available For Sale Securities, Gross Unrealized Gains | 606 | 551
Available For Sale Securities, Gross Unrealized Losses | 1,174 | 1,805
Available-for-sale Securities, Amortized Cost Basis | 140,374 | 129,041
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 | 2,097 | 2,480
Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Fair Value | 10,716 | 10,210
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value | 59,047 | 57,624
Available-for-sale Securities, Fair Value, Total | 71,860 | 70,314
Available For Sale Securities, Gross Unrealized Gains | 1,580 | 1,509
Available For Sale Securities, Gross Unrealized Losses | 363 | 734
Available-for-sale Securities, Amortized Cost Basis | $ 70,643 | $ 69,539

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