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Troubled Debt Restructurings (Details Textual)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2019
USD ($)
Investments
Dec. 31, 2018
USD ($)
Investments
Troubled Debt Restructurings (Textual)    
Total number of loans classified under troubled debt restructurings (TDRs) | Investments 26 26
Total sum of loans classified as troubled debt restructurings (TDRs) | $ $ 9,300 $ 9,300
Number of months previous loan payment defaulted 12 months 12 months