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Short-term borrowings - Summary of Short-term Borrowings (Details) - USD ($)
9 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Short-term Debt    
Ending Balance $ 99,450,000 $ 123,675,000
FHLB advances    
Short-term Debt    
Ending Balance 99,450 123,675
Average Balance 153,669 76,846
Maximum Month-End Balance $ 189,275 $ 123,675
Weighted Average Rate for 2.02% 1.17%
Weighted Average Rate at 2.38% 1.54%