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Securities sold under repurchase agreements (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Securities sold under repurchase agreements      
Financing transactions under repurchase agreements $ 10,663 $ 40,530  
Interest expense related to financing transactions $ 432 $ 1,100 $ 635