Investment Securities (Investments Classified by Contractual Maturity Date) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Investment Securities [Abstract]
Held to Maturity, Due in one year or less, Amortized Cost	$ 1,000
Held to Maturity, Due after one year through five years, Amortized Cost	21,516
Held to Maturity, Due after five years through ten years, Amortized Cost	28,528
Held to Maturity, Due after ten years, Amortized Cost	11,101
Held-to-maturity Securities, Amortized Cost	62,145	$ 62,390
Held to Maturity, Due in one year or less, Fair Value	1,000
Held to Maturity, Due after one year through five years, Fair Value	21,604
Held to Maturity, Due after five years through ten years, Fair Value	27,867
Held to Maturity, Due after ten years, Fair Value	10,344
Held-to-maturity, Total investment securities, Fair Value	60,815	62,420
Available for Sale, Due in one year or less, Amortized Cost	34,760
Available for Sale, Due after one year through five years, Amortized Cost	22,809
Available for Sale, Due after five years through ten years, Amortized Cost	23,062
Available for Sale, Due after ten years, Amortized Cost	25,819
Available-for-sale Securities, Amortized Cost	106,450	113,555
Available for Sale, Due in one year or less, Fair Value	34,531
Available for Sale, Due after one year through five years, Fair Value	22,419
Available for Sale, Due after five years through ten years, Fair Value	22,069
Available for Sale, Due after ten years, Fair Value	24,410
Available for Sale, Total investment securities, Fair Value	$ 103,429	$ 111,783