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Federal funds purchased and securities sold under agreements to repurchase (Tables)
 3 Months Ended
Mar. 31, 2018
Federal Funds Purchased and Securities Sold under Agreements to Repurchase [Abstract]  
Schedule of federal funds purchased and securities sold under agreements to repurchase
    March 31,     December 31,  
    2018     2017  
Federal funds purchased   $ 0     $ 0  
Repurchase agreements     34,795       27,560  
Total   $ 34,795     $ 27,560  
Schedule of repurchase agreements by remaining maturity of the agreements
Repurchase Agreements   Remaining Contractual Maturity of the Agreements  
    Overnight     Less     Greater        
    and     than     than        
(in thousands)   continuous     90 days     90 days     Total  
At March 31, 2018                        
U.S. Treasury   $ 1,948     $ 0     $ 0     $ 1,948  
U.S. government and federal agency obligations     2,987       0       0       2,987  
Government sponsored enterprises     9,220       0       0       9,220  
Asset-backed securities     20,640       0       0       20,640  
Total   $ 34,795     $ 0     $ 0     $ 34,795  
                                 
At December 31, 2017                                
U.S. Treasury   $ 1,964     $ 0     $ 0     $ 1,964  
U.S. government and federal agency obligations     2,977       0       0       2,977  
Government sponsored enterprises     8,382       0       0       8,382  
Asset-backed securities     14,237       0       0       14,237  
Total   $ 27,560     $ 0     $ 0     $ 27,560