Fair Value Measurements and Fair Value of Financial Instruments (Details) - Schedule of fair value no recurring item basis - Municipal Securities [Member] - USD ($)
$ in Thousands

12 Months Ended

Dec. 31, 2017

Dec. 31, 2016

Fair value

$ 9,632

$ 18,218

Valuation Techniques

Discounted Cash Flows

Discounted Cash Flows

Unobservable Input

 Discount Rate

 Discount Rate

Range

2.90%

2.80%