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Federal funds purchased and securities sold under agreements to repurchase (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Federal Funds Purchased and Securities Sold under Agreements to Repurchase [Abstract]    
Federal funds purchased $ 0 $ 992
Repurchase agreements 32,555 30,023
Total $ 32,555 $ 31,015