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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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