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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, 2020
Dec. 31, 2019
Available-for-sale, Amortized Cost    
Due in one year or less $ 4,415  
Due after one year through five years 64,310  
Due after five years through ten years 229,933  
Due after ten years 771,821  
Amortized cost, total 1,070,479  
Available-for-sale, Fair Value    
Due in one year or less 4,448  
Due after one year through five years 66,551  
Due after five years through ten years 244,118  
Due after ten years 791,952  
Fair value, total 1,107,069  
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]    
Due in one year or less 0  
Due after one year through five years 510  
Due after five years through ten years 788  
Due after ten years 0  
Amortized Cost 1,298 $ 1,302
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Fair Value [Abstract]    
Due in one year or less 0  
Due after one year through five years 547  
Due after five years through ten years 856  
Due after ten years 0  
Fair value, total $ 1,403 $ 1,359