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Troubled Debt Restructurings (Details Textual)
$ in Thousands
6 Months Ended
Jun. 30, 2018
USD ($)
Investments
Jun. 30, 2017
Dec. 31, 2017
USD ($)
Investments
Troubled Debt Restructurings (Textual)      
Total number of loans classified under troubled debt restructurings (TDRs) | Investments 28   21
Total sum of loans classified as troubled debt restructurings (TDRs) | $ $ 10,600   $ 7,800
Number of months previous loan payment defaulted 12 months 12 months