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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%

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