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Federal funds purchased and securities sold under agreements to repurchase (Details 1) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements $ 32,555 $ 30,023
U.S. government and federal agency obligations    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements 3,225 3,489
Government sponsored enterprises    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements 9,134 7,324
Asset-backed securities    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements 20,196 19,210
Overnight and continuous    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements 32,555 30,023
Overnight and continuous | U.S. government and federal agency obligations    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements 3,225 3,489
Overnight and continuous | Government sponsored enterprises    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements 9,134 7,324
Overnight and continuous | Asset-backed securities    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements 20,196 19,210
Less than 90 days    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements 0 0
Less than 90 days | U.S. government and federal agency obligations    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements 0 0
Less than 90 days | Government sponsored enterprises    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements 0 0
Less than 90 days | Asset-backed securities    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements 0 0
Greater than 90 days    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements 0 0
Greater than 90 days | U.S. government and federal agency obligations    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements 0 0
Greater than 90 days | Government sponsored enterprises    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements 0 0
Greater than 90 days | Asset-backed securities    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements $ 0 $ 0