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SECURITIES - Amortized Cost and Estimated Fair Value of Investments in Debt Securities By Contractual Maturity (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Available for sale, Amortized Cost |  |
Due in one year or less | $ 139,916 |
Due after one year through five years | 4,260 |
Due after five years through ten years | 22,203 |
Due after ten years | 591,809 |
Total available-for-sale investment securities | 758,188 |
Mortgage-backed Securities | 574,279 |
Amortized cost | 1,332,467 | $ 1,387,874
Available for sale Securities, Fair Value |  |
Due in one year or less | 139,935 |
Due after one year through five years | 4,242 |
Due after five years through ten years | 21,689 |
Due after ten years | 556,697 |
Subtotal | 722,563 |
Mortgage-backed Securities and Other Equity Securities | 573,731 |
Total | 1,296,294 | 1,299,014
Held to Maturity, Amortized Cost |  |
Due in one year or less | 15,969 |
Due after one year through five years | 4,868 |
Due after five years through ten years | 140,774 |
Due after ten years | 1,024,541 |
Subtotal | 1,186,152 |
Mortgage-backed Securities | 120,901 |
Amortized Cost | 1,307,053 | 1,326,729
Held to Maturity, Fair Value |  |
Due in one year or less | 15,092 |
Due after one year through five years | 4,739 |
Due after five years through ten years | 126,474 |
Due after ten years | 908,434 |
Subtotal | 1,054,739 |
Mortgage-backed Securities | 111,423 |
Total | $ 1,166,162 | $ 1,149,156

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