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Short-term borrowings - Summary of Short-term Borrowings (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Short-term Debt |  |  |
Ending Balance | $ 152,150 | $ 86,500 |
FHLB advances |  |  |
Short-term Debt |  |  |
Ending Balance | 152,150 | 86,500 | $ 123,675
Average Balance | 62,941 | 133,834 | 76,846
Maximum Month-End Balance | $ 152,150 | $ 189,275 | $ 123,675
Weighted Average Rate for | 2.61% | 2.05% | 1.17%
Weighted Average Rate at | 1.84% | 2.62% | 1.54%

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