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Security Types (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Debt Maturities, within One Year, Fair Value | $ 9,453 | $ 0
Available-for-sale Securities, Debt Maturities, after One Through Five Years, Fair Value | 22,836 | 31,817
Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Fair Value | 38,484 | 45,009
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value | 172,563 | 180,871
Available-for-sale Securities, Fair Value, Total | 243,336 | 257,697
Available For Sale Securities, Gross Unrealized Gains | 507 | 2,025
Available For Sale Securities, Gross Unrealized Losses | 8,295 | 2,780
Available-for-sale Securities, Amortized Cost Basis | 251,124 | 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 | 9,453 | 0
Available-for-sale Securities, Debt Maturities, after One Through Five Years, Fair Value | 19,445 | 29,253
Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Fair Value | 21,591 | 23,809
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value | 0 | 0
Available-for-sale Securities, Fair Value, Total | 50,489 | 53,062
Available For Sale Securities, Gross Unrealized Gains | 0 | 79
Available For Sale Securities, Gross Unrealized Losses | 1,899 | 904
Available-for-sale Securities, Amortized Cost Basis | 52,388 | 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 | 8,893 | 11,201
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value | 113,147 | 121,871
Available-for-sale Securities, Fair Value, Total | 122,040 | 133,072
Available For Sale Securities, Gross Unrealized Gains | 46 | 330
Available For Sale Securities, Gross Unrealized Losses | 5,230 | 1,639
Available-for-sale Securities, Amortized Cost Basis | 127,224 | 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 | 3,391 | 2,564
Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Fair Value | 8,000 | 9,999
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value | 59,416 | 59,000
Available-for-sale Securities, Fair Value, Total | 70,807 | 71,563
Available For Sale Securities, Gross Unrealized Gains | 461 | 1,616
Available For Sale Securities, Gross Unrealized Losses | 1,166 | 237
Available-for-sale Securities, Amortized Cost Basis | $ 71,512 | $ 70,184

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