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Federal funds purchased and securities sold under agreements to repurchase - Summary (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Federal funds purchased and securities sold under agreements to repurchase    
Federal funds purchased $ 0 $ 8,000
Repurchase agreements 27,191 16,647
Total $ 27,191 $ 24,647