Investments (Details 3) $ in Thousands	Sep. 30, 2017 USD ($)
Contractual Maturity of Investment Securities
Due in less than one year, Amortized Cost	$ 1,563
Due after one year through five years, Amortized Cost	4,066
Due after five years through ten years, Amortized Cost	2,624
Due after ten years, Amortized Cost	6,893
Amortized Cost - Available-for sale Debt Securities	15,146
Due in less than one year, Fair Value	1,552
Due after one year through five years, Fair Value	4,003
Due after five years through ten years, Fair Value	2,555
Due after ten years, Fair Value	6,976
Total Fair Value - Available-for-sale Debt Securities	$ 15,086