Investment Securities (Investments Classified by Contractual Maturity Date) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Investment Securities [Abstract]
Held to Maturity, Due after one year through five years, Amortized Cost	$ 22,480
Held to Maturity, Due after five years through ten years, Amortized Cost	27,886
Held to Maturity, Due after ten years, Amortized Cost	11,853
Held-to-maturity Securities, Amortized Cost	62,219	$ 62,390
Held to Maturity, Due after one year through five years, Fair Value	22,637
Held to Maturity, Due after five years through ten years, Fair Value	27,251
Held to Maturity, Due after ten years, Fair Value	11,116
Held-to-maturity, Total investment securities, Fair Value	61,004	62,420
Available for Sale, Due in one year or less, Amortized Cost	27,420
Available for Sale, Due after one year through five years, Amortized Cost	33,510
Available for Sale, Due after five years through ten years, Amortized Cost	18,216
Available for Sale, Due after ten years, Amortized Cost	32,529
Available-for-sale Securities, Amortized Cost	111,675	113,555
Available for Sale, Due in one year or less, Fair Value	27,236
Available for Sale, Due after one year through five years, Fair Value	33,034
Available for Sale, Due after five years through ten years, Fair Value	17,627
Available for Sale, Due after ten years, Fair Value	30,992
Available for Sale, Total investment securities, Fair Value	$ 108,889	$ 111,783