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Securities - Narrative (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Secure government, public and trust deposits |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available for sale securities pledged as collateral | $ 536,018 | $ 582,338
Short-term borrowings |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available for sale securities pledged as collateral | $ 21,445 | $ 32,272

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