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INVESTMENTS (Schedule of Amortized Cost and Estimated Fair Values of Debt Securities by Contractual Maturity) (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Available-for-sale, Amortized Cost
Due in one year or less	$ 116
Due after one year through five years	11,695
Due after five years through ten years	11,303
Due after ten years	0
Subtotal	23,114
Mortgage-related securities	875,031
Available-for-sale securities, book value	898,145	$ 673,003
Available-for-sale, Fair Value
Due in one year or less	116
Due after one year through five years	11,207
Due after five years through ten years	10,232
Due after ten years	0
Subtotal	21,555
Mortgage-related securities	814,575
Fair value, total	$ 836,130	$ 593,749

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