Investment Securities (Investments Classified by Contractual Maturity Date) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Investment Securities [Abstract]
Held to Maturity, Due after one year through five years, Amortized Cost	$ 26,118
Held to Maturity, Due after five years through ten years, Amortized Cost	28,381
Held to Maturity, Due after ten years, Amortized Cost	12,641
Held-to-maturity Securities, Amortized Cost	67,140	$ 67,022
Held to Maturity, Due after one year through five years, Fair Value	26,573
Held to Maturity, Due after five years through ten years, Fair Value	28,346
Held to Maturity, Due after ten years, Fair Value	12,310
Held-to-maturity, Total investment securities, Fair Value	67,229	66,124
Available for Sale, Due in one year or less, Amortized Cost	14,220
Available for Sale, Due after one year through five years, Amortized Cost	43,350
Available for Sale, Due after five years through ten years, Amortized Cost	11,564
Available for Sale, Due after ten years, Amortized Cost	40,128
Available-for-sale Securities, Amortized Cost	109,262	116,830
Available for Sale, Due in one year or less, Fair Value	14,200
Available for Sale, Due after one year through five years, Fair Value	43,153
Available for Sale, Due after five years through ten years, Fair Value	11,408
Available for Sale, Due after ten years, Fair Value	39,247
Available for Sale, Total investment securities, Fair Value	$ 108,008	$ 115,184