Investment Securities (Investments Classified by Contractual Maturity Date) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Investment Securities [Abstract]
Held to Maturity, Due in one year or less, Amortized Cost	$ 11,599
Held to Maturity, Due after one year through five years, Amortized Cost	11,715
Held to Maturity, Due after five years through ten years, Amortized Cost	29,359
Held to Maturity, Due after ten years, Amortized Cost	9,353
Held-to-maturity Securities, Amortized Cost	62,026	$ 62,390
Held to Maturity, Due in one year or less, Estimated Fair Value	11,640
Held to Maturity, Due after one year through five years, Estimated Fair Value	11,714
Held to Maturity, Due after five years through ten years, Estimated Fair Value	28,992
Held to Maturity, Due after ten years, Estimated Fair Value	8,789
Held-to-maturity, Total investment securities, Estimated Fair Value	61,135	62,420
Available for Sale, Due in one year or less, Amortized Cost	22,755
Available for Sale, Due after one year through five years, Amortized Cost	33,134
Available for Sale, Due after five years through ten years, Amortized Cost	18,990
Available for Sale, Due after ten years, Amortized Cost	23,886
Available-for-sale Securities, Amortized Cost	98,765	113,555
Available for Sale, Due in one year or less, Estimated Fair Value	22,674
Available for Sale, Due after one year through five years, Estimated Fair Value	32,791
Available for Sale, Due after five years through ten years, Estimated Fair Value	18,380
Available for Sale, Due after ten years, Estimated Fair Value	22,798
Available for Sale, Total investment securities, Estimated Fair Value	$ 96,643	$ 111,783