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Securities - Schedule of Held-to-Maturity Securities Amortized Cost and Estimated Fair Value (Details) - USD ($) | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Amortized Cost |  |
Due after five years through ten years | $ 269,268,000 |
Total held-to-maturity debt securities | 269,268,000 | $ 0
Fair Value |  |
Due after five years through ten years | 268,283,000 |
Total held-to-maturity debt securities | $ 268,283,000 | $ 0

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