Investment Securities (Investments Classified by Contractual Maturity Date) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Investment Securities [Abstract]
Held to Maturity, Due in one year or less, Amortized Cost	$ 11,668
Held to Maturity, Due after one year through five years, Amortized Cost	14,974
Held to Maturity, Due after five years through ten years, Amortized Cost	26,711
Held to Maturity, Due after ten years, Amortized Cost	7,647
Held-to-maturity Securities, Amortized Cost	61,000	$ 62,026
Held to Maturity, Due in one year or less, Estimated Fair Value	11,701
Held to Maturity, Due after one year through five years, Estimated Fair Value	15,035
Held to Maturity, Due after five years through ten years, Estimated Fair Value	26,720
Held to Maturity, Due after ten years, Estimated Fair Value	7,450
Held-to-maturity, Total investment securities, Estimated Fair Value	60,906	61,135
Available for Sale, Due in one year or less, Amortized Cost	15,555
Available for Sale, Due after one year through five years, Amortized Cost	30,137
Available for Sale, Due after five years through ten years, Amortized Cost	18,405
Available for Sale, Due after ten years, Amortized Cost	24,337
Available-for-sale Securities, Amortized Cost	88,434	98,765
Available for Sale, Due in one year or less, Estimated Fair Value	15,508
Available for Sale, Due after one year through five years, Estimated Fair Value	29,957
Available for Sale, Due after five years through ten years, Estimated Fair Value	18,067
Available for Sale, Due after ten years, Estimated Fair Value	23,590
Available for Sale, Total investment securities, Estimated Fair Value	$ 87,122	$ 96,643