Investment Securities (Amortized Cost and Estimated Fair Value by Maturity Date) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Investment Securities [Abstract]
Available for sale, Amortized Cost, Due in one year or less	$ 5,994
Available for sale, Amortized Cost, Due after one year through five years	29,105
Available for sale, Amortized Cost, Due after five years through ten years	63,477
Available for sale, Amortized Cost, Due after ten years	54,270
Available for sale, Amortized Cost, Debt maturities	152,846
Available for sale, Estimated Fair Value, Due in one year or less	5,949
Available for sale, Estimated Fair Value, Due after one year through five years	28,741
Available for sale, Estimated Fair Value, Due after five years through ten years	62,754
Available for sale, Estimated Fair Value, Due after ten years	53,370
Available for sale, Estimated Fair Value, Debt maturities	150,814
Available for sale, Estimated Fair Value, Total	152,113	$ 155,701
Held to maturity securities, Amortized Cost, Due in one year or less	500
Held to maturity securities, Amortized Cost, Due after one year through five years	400
Held to maturity securities, Amortized Cost, Due after five years through ten years	3,501
Held to maturity securities, Amortized Cost, Due after ten years	1,498
Held to maturity securities, Amortized Cost, Debt maturities	5,899
Held to maturity securities, Amortized Cost, Total	5,899	6,043
Held to maturity securities, Estimated Fair Value, Due in one year or less	503
Held to maturity securities, Estimated Fair Value, Due after one year through five years	403
Held to maturity securities, Estimated Fair Value, Due after five years through ten years	3,472
Held to maturity securities, Estimated Fair Value, Due after ten years	1,487
Held to maturity securities, Estimated Fair Value, Debt maturities	5,865
Held-to-maturity securities, Estimated Fair Value, Total	$ 5,865	$ 6,000