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Short-term borrowings - Summary of Short-term Borrowings (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Short-term Debt    
Short-term borrowings $ 123,675 $ 82,700
FHLB advances    
Short-term Debt    
Short-term borrowings 123,675 82,700
Average Balance 76,846 67,553
Maximum Month-End Balance $ 123,675 $ 86,300
Weighted Average Rate for the Year 1.17% 0.60%
Weighted Average Rate at End of the Year 1.54% 0.74%