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Securities - Schedule of Amortized Cost and Estimated Fair Value of Securities by Contractual Maturity (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Available for Sale Securities, Amortized Cost |  |
Due in one year or less, Amortized Cost | $ 87,890 |
Due from one year to five years, Amortized Cost | 175,252 |
Due from five years to ten years, Amortized Cost | 38,428 |
Due after ten years, Amortized Cost | 10,589 |
Available for Sale Securities, with single maturity date, Amortized Cost | 312,159 |
Total Available for sale securities, Amortized Cost | 358,981 | $ 251,381
Available for Sale Securities, Fair Value |  |
Due in one year or less, Fair Value | 87,668 |
Due from one year to five years, Fair Value | 173,829 |
Due from five years to ten years, Fair Value | 37,827 |
Due after ten years, Fair Value | 10,403 |
Available for Sale Securities, with single maturity date, Fair Value | 309,727 |
Available for Sale Securities, Fair Value | 355,981 | 250,603
Held to Maturity Securities, Amortized Cost |  |
Due from five years to ten years, Amortized Cost | 3,052 |
Due after ten years, Amortized Cost | 5,351 |
Held to Maturity Securities, with single maturity date, Amortized Cost | 8,403 |
Held to maturity securities, Amortized Cost | 8,403 | 8,557
Held to Maturity Securities, Fair Value |  |
Due from five years to ten years, Fair Value | 3,282 |
Due after ten years, Fair Value | 4,812 |
Held to Maturity Securities, with single maturity date, Fair Value | 8,094 |
Held to Maturity Securities, Fair Value | 8,094 | $ 7,527
Mortgage-backed Securities, Residential |  |
Available for Sale Securities, Amortized Cost |  |
Available for Sale Securities, without single maturity date, Amortized Cost | 31,067 |
Available for Sale Securities, Fair Value |  |
Available for Sale Securities, without single maturity date, Fair Value | 30,581 |
Asset Backed Securities |  |
Available for Sale Securities, Amortized Cost |  |
Available for Sale Securities, without single maturity date, Amortized Cost | 10,803 |
Available for Sale Securities, Fair Value |  |
Available for Sale Securities, without single maturity date, Fair Value | 10,805 |
SBA Pooled Securities |  |
Available for Sale Securities, Amortized Cost |  |
Available for Sale Securities, without single maturity date, Amortized Cost | 4,952 |
Available for Sale Securities, Fair Value |  |
Available for Sale Securities, without single maturity date, Fair Value | $ 4,868 |

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