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Short-term borrowings - Summary of Short-term Borrowings (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Short-term Debt    
Short-term borrowings $ 82,700 $ 38,325
Short-term borrowings, Average Balance 67,553 13,480
Short-term borrowings, Maximum Month-End Balance $ 86,300 $ 54,425
Short-term borrowings, Weighted Average Rate for the Year 0.60% 0.39%
Short-term borrowings, Weighted Average Rate at end of the Year 0.74% 0.43%
FHLB Advances    
Short-term Debt    
Short-term borrowings $ 82,700 $ 38,325
Short-term borrowings, Average Balance 67,553 13,458
Short-term borrowings, Maximum Month-End Balance $ 86,300 $ 54,425
Short-term borrowings, Weighted Average Rate for the Year 0.60% 0.39%
Short-term borrowings, Weighted Average Rate at end of the Year 0.74% 0.43%
Repurchase Agreements    
Short-term Debt    
Short-term borrowings, Average Balance   $ 22
Short-term borrowings, Weighted Average Rate for the Year   1.11%