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FAIR VALUES OF FINANCIAL INSTRUMENTS - Securities in Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Securities in an unrealized loss position, fair value [Abstract]    
One year or greater $ 2,590,214 $ 4,736,171
Less than one year 1,890,032 1,475,120
Fair Value, Total 4,480,246 6,211,291
Securities in an unrealized loss position, aggregate loss [Abstract]    
One year or greater 22,844 83,407
Less than one year 8,042 8,561
Unrealized Losses, Total $ 30,886 $ 91,968