Investment Securities (Amortized Cost and Estimated Fair Value by Maturity Date) (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Amortized Cost, Due in one year or less	$ 15,012
Available for sale, Amortized Cost, Due after one year through five years	26,022
Available for sale, Amortized Cost, Due after five years through ten years	17,745
Available for sale, Amortized Cost, Due after ten years	118,981
Available for sale, Amortized Cost, Debt maturities	177,760
Available-for-sale securities, Amortized Cost	178,415	$ 165,462
Available for sale, Estimated Fair Value, Due in one year or less	15,007
Available for sale, Estimated Fair Value, Due after one year through five years	25,974
Available for sale, Estimated Fair Value, Due after five years through ten years	17,670
Available for sale, Estimated Fair Value, Due after ten years	118,773
Available for sale, Estimated Fair Value, Debt maturities	177,424
Available for sale, Estimated Fair Value, Total	178,072	163,902
Held to maturity securities, Amortized Cost, Due in one year or less	210
Held to maturity securities, Amortized Cost, Due after one year through five years	500
Held to maturity securities, Amortized Cost, Due after five years through ten years	904
Held to maturity securities, Amortized Cost, Due after ten years	2,001
Held to maturity securities, Amortized Cost, Debt maturities	3,615
Held to maturity securities, Amortized Cost, Total	6,615	6,704
Held to maturity securities, Estimated Fair Value, Due in one year or less	210
Held to maturity securities, Estimated Fair Value, Due after one year through five years	529
Held to maturity securities, Estimated Fair Value, Due after five years through ten years	947
Held to maturity securities, Estimated Fair Value, Due after ten years	2,030
Held to maturity securities, Estimated Fair Value, Debt maturities	3,716
Held-to-maturity securities, Estimated Fair Value, Total	6,855	6,806
Equity [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Amortized Cost	655	652
Available for sale, Estimated Fair Value, Total	648	$ 640
Held to maturity securities, Amortized Cost, Total	3,000
Held to maturity securities, Estimated Fair Value, Debt maturities	$ 3,139