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Fair Value Disclosures - Assets Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Available for sale securities: |  |
Available for Sale Securities, Fair Value | $ 255,609 | $ 275,029
Fair Value, Measurements, Recurring [Member] |  |
Available for sale securities: |  |
Available for Sale Securities, Fair Value | 255,609 | 275,029
Mutual Fund |  |
Available for sale securities: |  |
Securities available for sale | 5,006 | 2,011
Mutual Fund | Fair Value, Measurements, Recurring [Member] |  |
Available for sale securities: |  |
Securities available for sale | 5,006 | 2,011
U.S. Government Agency Obligations |  |
Available for sale securities: |  |
Securities available for sale | 109,890 | 180,942
U.S. Government Agency Obligations | Fair Value, Measurements, Recurring [Member] |  |
Available for sale securities: |  |
Securities available for sale | 109,890 | 180,942
U.S. Treasury notes | Fair Value, Measurements, Recurring [Member] |  |
Available for sale securities: |  |
Securities available for sale | 1,934 |
Mortgage-backed Securities, Residential |  |
Available for sale securities: |  |
Securities available for sale | 33,663 | 24,990
Mortgage-backed Securities, Residential | Fair Value, Measurements, Recurring [Member] |  |
Available for sale securities: |  |
Securities available for sale | 33,663 | 24,990
Asset Backed Securities |  |
Available for sale securities: |  |
Securities available for sale | 11,845 | 12,902
Asset Backed Securities | Fair Value, Measurements, Recurring [Member] |  |
Available for sale securities: |  |
Securities available for sale | 11,845 | 12,902
State and Municipal |  |
Available for sale securities: |  |
Securities available for sale | 74,391 | 26,637
State and Municipal | Fair Value, Measurements, Recurring [Member] |  |
Available for sale securities: |  |
Securities available for sale | 74,391 | 26,637
Corporate Bonds |  |
Available for sale securities: |  |
Securities available for sale | 15,320 | 27,390
Corporate Bonds | Fair Value, Measurements, Recurring [Member] |  |
Available for sale securities: |  |
Securities available for sale | 15,320 | 27,390
SBA Pooled Securities |  |
Available for sale securities: |  |
Securities available for sale | 3,560 | 157
SBA Pooled Securities | Fair Value, Measurements, Recurring [Member] |  |
Available for sale securities: |  |
Securities available for sale | 3,560 | 157
Level 1 | Fair Value, Measurements, Recurring [Member] |  |
Available for sale securities: |  |
Available for Sale Securities, Fair Value | 5,006 | 2,011
Level 1 | Mutual Fund | Fair Value, Measurements, Recurring [Member] |  |
Available for sale securities: |  |
Securities available for sale | 5,006 | 2,011
Level 2 | Fair Value, Measurements, Recurring [Member] |  |
Available for sale securities: |  |
Available for Sale Securities, Fair Value | 250,603 | 273,018
Level 2 | U.S. Government Agency Obligations | Fair Value, Measurements, Recurring [Member] |  |
Available for sale securities: |  |
Securities available for sale | 109,890 | 180,942
Level 2 | U.S. Treasury notes | Fair Value, Measurements, Recurring [Member] |  |
Available for sale securities: |  |
Securities available for sale | 1,934 |
Level 2 | Mortgage-backed Securities, Residential | Fair Value, Measurements, Recurring [Member] |  |
Available for sale securities: |  |
Securities available for sale | 33,663 | 24,990
Level 2 | Asset Backed Securities | Fair Value, Measurements, Recurring [Member] |  |
Available for sale securities: |  |
Securities available for sale | 11,845 | 12,902
Level 2 | State and Municipal | Fair Value, Measurements, Recurring [Member] |  |
Available for sale securities: |  |
Securities available for sale | 74,391 | 26,637
Level 2 | Corporate Bonds | Fair Value, Measurements, Recurring [Member] |  |
Available for sale securities: |  |
Securities available for sale | 15,320 | 27,390
Level 2 | SBA Pooled Securities | Fair Value, Measurements, Recurring [Member] |  |
Available for sale securities: |  |
Securities available for sale | $ 3,560 | $ 157

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