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FAIR VALUES OF FINANCIAL INSTRUMENTS - Securities in Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Securities in an unrealized loss position, fair value [Abstract]    
Fair Value, Total $ 1,343,086 $ 4,480,246
Securities in an unrealized loss position, aggregate loss [Abstract]    
Unrealized Losses, Total 13,148 30,886
Fannie Mae/Freddie Mac [Member]    
Securities in an unrealized loss position, fair value [Abstract]    
One year or greater 690,227 2,030,192
Less than one year 583,870 1,473,144
Securities in an unrealized loss position, aggregate loss [Abstract]    
One year or greater 9,533 17,069
Less than one year 3,107 6,684
Ginnie Mae [Member]    
Securities in an unrealized loss position, fair value [Abstract]    
One year or greater 27,462 560,022
Less than one year 41,527 416,888
Securities in an unrealized loss position, aggregate loss [Abstract]    
One year or greater 285 5,775
Less than one year $ 223 $ 1,358