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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%

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