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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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