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Securities - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2022 | Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items] |  |
Allowance for credit losses - held to maturity securities | $ 32 | $ 32
Amortized cost of debt securities held to maturity rated A or higher by rating agencies (percent) | 99.90% |
Secure government, public and trust deposits |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available for sale securities pledged as collateral | $ 684,687 | 607,681
Short-term borrowings |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available for sale securities pledged as collateral | $ 18,305 | $ 21,493

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