Investment Securities (Amortized Cost and Estimated Fair Value by Maturity Date) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Amortized Cost, Due in one year or less	$ 12,005
Available for sale, Amortized Cost, Due after one year through five years	34,992
Available for sale, Amortized Cost, Due after five years through ten years	18,649
Available for sale, Amortized Cost, Due after ten years	134,902
Available for sale, Amortized Cost, Debt maturities	200,548
Available-for-sale securities, Amortized Cost	201,207	$ 165,462
Available for sale, Estimated Fair Value, Due in one year or less	11,997
Available for sale, Estimated Fair Value, Due after one year through five years	34,997
Available for sale, Estimated Fair Value, Due after five years through ten years	18,651
Available for sale, Estimated Fair Value, Due after ten years	135,284
Available for sale, Estimated Fair Value, Debt maturities	200,929
Available for sale, Estimated Fair Value, Total	201,587	163,902
Held to maturity securities, Amortized Cost, Due after one year through five years	501
Held to maturity securities, Amortized Cost, Due after five years through ten years	903
Held to maturity securities, Amortized Cost, Due after ten years	2,007
Held to maturity securities, Amortized Cost, Debt maturities	3,411
Held to maturity securities, Amortized Cost, Total	6,411	6,704
Held to maturity securities, Estimated Fair Value, Due after one year through five years	527
Held to maturity securities, Estimated Fair Value, Due after five years through ten years	949
Held to maturity securities, Estimated Fair Value, Due after ten years	2,063
Held to maturity securities, Estimated Fair Value, Debt maturities	3,539
Held-to-maturity securities, Estimated Fair Value, Total	6,663	6,806
Equity [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Amortized Cost	659	652
Available for sale, Estimated Fair Value, Total	658	$ 640
Held to maturity securities, Amortized Cost, Total	3,000
Held to maturity securities, Estimated Fair Value, Debt maturities	$ 3,124