Investment Securities (Amortized Cost and Estimated Fair Value by Maturity Date) (Details) $ in Thousands	Sep. 30, 2018 USD ($)
Investment Securities [Abstract]
Available for sale, Amortized Cost, Due in one year or less	$ 8,000
Available for sale, Amortized Cost, Due after one year through five years	34,457
Available for sale, Amortized Cost, Due after five years through ten years	63,419
Available for sale, Amortized Cost, Due after ten years	67,342
Available for sale, Amortized Cost, Debt maturities	173,218
Available for sale, Estimated Fair Value, Due in one year or less	7,985
Available for sale, Estimated Fair Value, Due after one year through five years	33,577
Available for sale, Estimated Fair Value, Due after five years through ten years	61,099
Available for sale, Estimated Fair Value, Due after ten years	65,014
Available for sale, Estimated Fair Value, Debt maturities	167,675
Held to maturity securities, Amortized Cost, Due after one year through five years	901
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	1,635
Held to maturity securities, Amortized Cost, Debt maturities	6,037
Held to maturity securities, Estimated Fair Value, Due after one year through five years	913
Held to maturity securities, Estimated Fair Value, Due after five years through ten years	3,485
Held to maturity securities, Estimated Fair Value, Due after ten years	1,585
Held to maturity securities, Estimated Fair Value, Debt maturities	$ 5,983