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Securities - Schedule of Amortized Cost and Estimated Fair Value of Debt Securities by Contractual Maturity (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Available for Sale Securities, Amortized Cost |  |
Due in one year or less, Amortized Cost | $ 97,927 |
Due from one year to five years, Amortized Cost | 142,072 |
Due from five years to ten years, Amortized Cost | 33,653 |
Due after ten years, Amortized Cost | 9,434 |
Available for Sale Securities, with single maturity date, Amortized Cost | 283,086 |
Available for sale securities, Amortized Cost | 337,988 | $ 251,381
Available for Sale Securities, Fair Value |  |
Due in one year or less, Fair Value | 97,560 |
Due from one year to five years, Fair Value | 141,574 |
Due from five years to ten years, Fair Value | 33,370 |
Due after ten years, Fair Value | 9,314 |
Available for Sale Securities, with single maturity date, Fair Value | 281,818 |
Available for Sale Securities, Fair Value | 336,423 | 250,603
Held to Maturity Securities, Amortized Cost |  |
Due from five years to ten years, Amortized Cost | 6,648 |
Due after ten years, Amortized Cost | 1,839 |
Held to Maturity Securities, with single maturity date, Amortized Cost | 8,487 |
Held to maturity securities, Amortized Cost | 8,487 | 8,557
Held to Maturity Securities, Fair Value |  |
Due from five years to ten years, Fair Value | 5,713 |
Due after ten years, Fair Value | 1,613 |
Held to Maturity Securities, with single maturity date, Fair Value | 7,326 |
Held to Maturity Securities, Fair Value | 7,326 | 7,527
Mortgage-backed Securities, Residential |  |
Available for Sale Securities, Amortized Cost |  |
Available for Sale Securities, without single maturity date, Amortized Cost | 39,971 |
Available for sale securities, Amortized Cost | 39,971 | 33,537
Available for Sale Securities, Fair Value |  |
Available for Sale Securities, without single maturity date, Fair Value | 39,736 |
Available for Sale Securities, Fair Value | 39,736 | 33,663
Asset Backed Securities |  |
Available for Sale Securities, Amortized Cost |  |
Available for Sale Securities, without single maturity date, Amortized Cost | 10,165 |
Available for sale securities, Amortized Cost | 10,165 | 11,883
Available for Sale Securities, Fair Value |  |
Available for Sale Securities, without single maturity date, Fair Value | 10,145 |
Available for Sale Securities, Fair Value | 10,145 | 11,845
SBA Pooled Securities |  |
Available for Sale Securities, Amortized Cost |  |
Available for Sale Securities, without single maturity date, Amortized Cost | 4,766 |
Available for sale securities, Amortized Cost | 4,766 | 3,535
Available for Sale Securities, Fair Value |  |
Available for Sale Securities, without single maturity date, Fair Value | 4,724 |
Available for Sale Securities, Fair Value | $ 4,724 | $ 3,560

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