Investment Securities (Amortized Cost and Estimated Fair Value by Maturity Date) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Amortized Cost, Due in one year or less	$ 9,000
Available for sale, Amortized Cost, Due after one year through five years	40,973
Available for sale, Amortized Cost, Due after five years through ten years	34,242
Available for sale, Amortized Cost, Due after ten years	128,523
Available for sale, Amortized Cost, Debt maturities	212,738
Available-for-sale securities, Amortized Cost	213,400	$ 165,462
Available for sale, Estimated Fair Value, Due in one year or less	8,996
Available for sale, Estimated Fair Value, Due after one year through five years	40,831
Available for sale, Estimated Fair Value, Due after five years through ten years	34,241
Available for sale, Estimated Fair Value, Due after ten years	128,660
Available for sale, Estimated Fair Value, Debt maturities	212,728
Available for sale, Estimated Fair Value, Total	213,390	163,902
Held to maturity securities, Amortized Cost, Due after one year through five years	902
Held to maturity securities, Amortized Cost, Due after five years through ten years	3,502
Held to maturity securities, Amortized Cost, Due after ten years	1,837
Held to maturity securities, Amortized Cost, Debt maturities	6,241
Held to maturity securities, Amortized Cost, Total	6,241	6,704
Held to maturity securities, Estimated Fair Value, Due after one year through five years	946
Held to maturity securities, Estimated Fair Value, Due after five years through ten years	3,626
Held to maturity securities, Estimated Fair Value, Due after ten years	1,879
Held to maturity securities, Estimated Fair Value, Debt maturities	6,451
Held-to-maturity securities, Estimated Fair Value, Total	6,451	6,806
Equity [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Amortized Cost	662	652
Available for sale, Estimated Fair Value, Total	$ 662	$ 640