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

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