Troubled Debt Restructurings (Details Textual) $ in Thousands	9 Months Ended
	Sep. 30, 2018 USD ($) Investments	Sep. 30, 2017	Dec. 31, 2017 USD ($) Investments
Troubled Debt Restructurings (Textual)
Total number of loans classified under troubled debt restructurings (TDRs) | Investments	26		21
Total sum of loans classified as troubled debt restructurings (TDRs) | $	$ 8,900		$ 7,800
Number of months previous loan payment defaulted	12 months	12 months