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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, 2023
Dec. 31, 2022
Available-for-sale, Amortized Cost    
Due in one year or less $ 1,001  
Due after one year through five years 10,304  
Due after five years through ten years 53,030  
Due after ten years 0  
Subtotal 64,335  
Mortgage-related securities 640,684  
Available-for-sale securities, book value 705,019 $ 796,960
Available-for-sale, Fair Value    
Due in one year or less 995  
Due after one year through five years 9,272  
Due after five years through ten years 48,944  
Due after ten years 0  
Subtotal 59,211  
Mortgage-related securities 529,792  
Fair value, total $ 589,003 $ 695,875