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Securities - Amortized Cost and Estimated Fair Value of Held-to-Maturity Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Amortized Cost |  |
Held-to-maturity debt securities: | $ 312,415 | $ 312,401
Total held-to-maturity debt securities | 312,415 | 312,401
Fair Value |  |
Due after five years through ten years | 265,102 | 267,455
Total held-to-maturity debt securities | $ 265,102 | $ 267,455

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