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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, 2022	Dec. 31, 2021
Available-for-sale, Amortized Cost
Due in one year or less	$ 501
Due after one year through five years	15,785
Due after five years through ten years	60,070
Due after ten years	0
Subtotal	76,356
Mortgage-related securities	757,532
Available-for-sale securities, book value	833,888	$ 1,508,981
Available-for-sale, Fair Value
Due in one year or less	500
Due after one year through five years	14,033
Due after five years through ten years	57,486
Due after ten years	0
Subtotal	72,019
Mortgage-related securities	651,599
Fair value, total	$ 723,618	$ 1,507,486

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