Investment Securities (Investments Classified by Contractual Maturity Date) (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Investment Securities [Abstract]
Held to Maturity, Due in one year or less, Amortized Cost	$ 11,804
Held to Maturity, Due after one year through five years, Amortized Cost	13,171
Held to Maturity, Due after five years through ten years, Amortized Cost	29,198
Held to Maturity, Due after ten years, Amortized Cost	3,318
Held-to-maturity Securities, Amortized Cost	57,491	$ 62,026
Held to Maturity, Due in one year or less, Estimated Fair Value	11,821
Held to Maturity, Due after one year through five years, Estimated Fair Value	13,210
Held to Maturity, Due after five years through ten years, Estimated Fair Value	29,487
Held to Maturity, Due after ten years, Estimated Fair Value	3,366
Held-to-maturity, Total investment securities, Estimated Fair Value	57,884	61,135
Available for Sale, Due in one year or less, Amortized Cost	15,996
Available for Sale, Due after one year through five years, Amortized Cost	15,546
Available for Sale, Due after five years through ten years, Amortized Cost	12,527
Available for Sale, Due after ten years, Amortized Cost	21,647
Available-for-sale Securities, Amortized Cost	65,716	98,765
Available for Sale, Due in one year or less, Estimated Fair Value	15,990
Available for Sale, Due after one year through five years, Estimated Fair Value	15,559
Available for Sale, Due after five years through ten years, Estimated Fair Value	12,470
Available for Sale, Due after ten years, Estimated Fair Value	21,435
Available for Sale, Total investment securities, Estimated Fair Value	$ 65,454	$ 96,643