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Derivatives and hedging activities - Fair Values of Derivative Instruments on the Balance Sheet (Details)
$ in Thousands
Jun. 30, 2018
USD ($)
security
Dec. 31, 2017
USD ($)
security
Interest rate swap.    
Derivatives, Fair Value    
Number of instruments held | security 6 5
Notional amount $ 63,226 $ 55,928
Derivatives designated as hedging instruments | Other Assets. | Interest Rate Products    
Derivatives, Fair Value    
Asset Derivatives 574 655
Derivatives designated as hedging instruments | Other Liabilities | Interest Rate Products    
Derivatives, Fair Value    
Liability Derivatives 568 733
Derivatives not designated as hedging instruments    
Derivatives, Fair Value    
Asset Derivatives 574 655
Liability Derivatives $ 568 $ 733