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Securities - Amortized Cost and Estimated Fair Value of Investments in Debt Securities by Contractual Maturity (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Available for sale, Amortized Cost |  |
Due in one year or less | $ 176,356 |
Due after one year through five years | 1,797 |
Due after five years through ten years | 25,600 |
Due after ten years | 453,785 |
Total available-for-sale investment securities | 657,538 |
MBS: | 775,559 |
Amortized Cost | 1,433,097 | $ 1,332,467
Available for sale, Fair Value |  |
Due in one year or less | 176,436 |
Due after one year through five years | 1,810 |
Due after five years through ten years | 25,193 |
Due after ten years | 422,014 |
Total available-for-sale investment securities | 625,453 |
MBS: | 782,984 |
Total | 1,408,437 | 1,296,294
Held to maturity, Amortized Cost |  |
Due in one year or less | 4,118 |
Due after one year through five years | 11,920 |
Due after five years through ten years | 141,206 |
Due after ten years | 1,015,088 |
Total held-to-maturity investment securities | 1,172,332 |
Mortgage-backed securities | 116,071 |
Amortized cost | 1,288,403 | 1,307,053
Held to maturity, Fair Value |  |
Due in one year or less | 4,087 |
Due after one year through five years | 11,695 |
Due after five years through ten years | 131,105 |
Due after ten years | 913,482 |
Total held-to-maturity investment securities | 1,060,369 |
Mortgage-backed securities | 109,154 |
Total | $ 1,169,523 | $ 1,166,162

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