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Short-Term Borrowings - Narrative (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018 | Sep. 30, 2018
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Short-term borrowings |  |  |
Short‑term borrowings | $ 0 | $ 93,460 |
Federal Funds Purchased |  |  |
Short-term borrowings |  |  |
Short‑term borrowings |  | $ 93,500 | $ 73,930

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