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INVESTMENTS (Schedule of Amortized Cost and Estimated Fair Values of Debt Securities by Contractual Maturity) (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Available-for-sale, Amortized Cost |  |
Due in one year or less | $ 115 |
Due after one year through five years | 13,865 |
Due after five years through ten years | 9,150 |
Due after ten years | 0 |
Subtotal | 23,130 |
Mortgage-related securities | 912,505 |
Available-for-sale securities, book value | 935,635 | $ 673,003
Available-for-sale, Fair Value |  |
Due in one year or less | 115 |
Due after one year through five years | 13,560 |
Due after five years through ten years | 8,807 |
Due after ten years | 0 |
Subtotal | 22,482 |
Mortgage-related securities | 867,283 |
Fair value, total | $ 889,765 | $ 593,749

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