Investment Securities (Investments Classified by Contractual Maturity Date) (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Investment Securities [Abstract]
Held to Maturity, Due in one year or less, Amortized Cost	$ 11,735
Held to Maturity, Due after one year through five years, Amortized Cost	14,149
Held to Maturity, Due after five years through ten years, Amortized Cost	27,454
Held to Maturity, Due after ten years, Amortized Cost	6,611
Held-to-maturity Securities, Amortized Cost	59,949	$ 62,026
Held to Maturity, Due in one year or less, Estimated Fair Value	11,770
Held to Maturity, Due after one year through five years, Estimated Fair Value	14,245
Held to Maturity, Due after five years through ten years, Estimated Fair Value	27,697
Held to Maturity, Due after ten years, Estimated Fair Value	6,610
Held-to-maturity, Total investment securities, Estimated Fair Value	60,322	61,135
Available for Sale, Due in one year or less, Amortized Cost	14,989
Available for Sale, Due after one year through five years, Amortized Cost	18,448
Available for Sale, Due after five years through ten years, Amortized Cost	14,329
Available for Sale, Due after ten years, Amortized Cost	22,640
Available-for-sale Securities, Amortized Cost	70,406	98,765
Available for Sale, Due in one year or less, Estimated Fair Value	14,968
Available for Sale, Due after one year through five years, Estimated Fair Value	18,455
Available for Sale, Due after five years through ten years, Estimated Fair Value	14,214
Available for Sale, Due after ten years, Estimated Fair Value	22,294
Available for Sale, Total investment securities, Estimated Fair Value	$ 69,931	$ 96,643