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Short-term borrowings - Summary of Short-term Borrowings (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Short-term Debt [Line Items]    
Short-term borrowings $ 38,325 $ 19,557
Short-term borrowings, Average Balance 13,480 14,871
Short-term borrowings, Maximum Month-End Balance $ 54,425 $ 41,715
Short-term borrowings, Weighted Average Rate for the Year 0.39% 0.48%
Short-term borrowings, Weighted Average Rate at end of the Year 0.43% 0.28%
FHLB Advances [Member]    
Short-term Debt [Line Items]    
Short-term borrowings $ 38,325 $ 18,875
Short-term borrowings, Average Balance 13,458 2,142
Short-term borrowings, Maximum Month-End Balance $ 54,425 $ 18,875
Short-term borrowings, Weighted Average Rate for the Year 0.39% 0.25%
Short-term borrowings, Weighted Average Rate at end of the Year 0.43% 0.28%
Repurchase Agreements [Member]    
Short-term Debt [Line Items]    
Short-term borrowings   $ 682
Short-term borrowings, Average Balance $ 22 12,729
Short-term borrowings, Maximum Month-End Balance   $ 22,840
Short-term borrowings, Weighted Average Rate for the Year 1.11% 0.53%
Short-term borrowings, Weighted Average Rate at end of the Year   0.38%