Troubled Debt Restructurings (Details Textual) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($) Investment	Dec. 31, 2017 USD ($) Investment	Mar. 31, 2017 USD ($)
Troubled Debt Restructurings (Textual)
Total number of loans classified under troubled debt restructurings (TDRs) | Investment	22	21
Total sum of loans classified as troubled debt restructurings (TDRs)	$ 8,500	$ 7,800
Number of months previous loan payment defaulted	12 months
Recorded investment			$ 187,000