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Short-term borrowings - Summary of Short-term Borrowings (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Short-term Debt      
Ending Balance $ 86,500 $ 123,675  
FHLB advances      
Short-term Debt      
Ending Balance 86,500 123,675 $ 82,700
Average Balance 133,834 76,846 67,553
Maximum Month-End Balance $ 189,275 $ 123,675 $ 86,300
Weighted Average Rate for 2.05% 1.17% 0.60%
Weighted Average Rate at 2.62% 1.54% 0.74%