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Federal funds purchased and securities sold under agreements to repurchase (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Federal Funds Purchased and Securities Sold under Agreements to Repurchase [Abstract]    
Federal funds purchased $ 0 $ 0
Repurchase agreements 41,523 56,834
Total $ 41,523 $ 56,834