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Federal funds purchased and securities sold under agreements to repurchase (Details 1) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements $ 34,795 $ 27,560
U.S. Treasury    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements 1,948 1,964
U.S. government and federal agency obligations    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements 2,987 2,977
Government sponsored enterprises    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements 9,220 8,382
Asset-backed securities    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements 20,640 14,237
Overnight and continuous    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements 34,795 27,560
Overnight and continuous | U.S. Treasury    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements 1,948 1,964
Overnight and continuous | U.S. government and federal agency obligations    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements 2,987 2,977
Overnight and continuous | Government sponsored enterprises    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements 9,220 8,382
Overnight and continuous | Asset-backed securities    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements 20,640 14,237
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. Treasury    
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. Treasury    
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