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Securities - Amortized Cost and Estimated Fair Value of Held-to-Maturity Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Amortized Cost |  |
Due after five years through ten years | $ 284,009 |
Total held-to-maturity debt securities | 284,009 |
Fair Value |  |
Due after five years through ten years | 282,288 |
Total held-to-maturity debt securities | $ 282,288 | $ 0

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