Investment Securities Debt Securities by Contactual Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Available-for-sale
Due in one year or less, Amortized Cost	$ 627
Due from one to five years, Amortized Cost	5,834
Due from five to ten years, Amortized Cost	24,063
Due after ten years, Amortized Cost	17,351
Debt securities with single maturity date, Amortized Cost	47,875
Agency MBS, Amortized Cost	18,283
Total debt securities available-for-sale, Amortized Cost	66,158
Due in one year or less, Fair Value	631
Due from one to five years, Fair Value	5,882
Due from five to ten years, Fair Value	23,768
Due after ten years, Fair Value	16,831
Debt securities with single maturity date, Fair Value	47,112
Agency MBS, Fair Value	18,041
Total debt securities available-for-sale, Fair Value	65,153
Held-to-maturity
Due from one to five years, Amortized Cost	999
Total debt securities held-to-maturity, Amortized Cost	999	$ 5,217
Due from one to five years, Fair Value	999
Total debt securities held-to-maturity, Fair Value	$ 999	$ 5,100