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FAIR VALUE - Securities in Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Securities in an unrealized loss position, fair value [Abstract]    
Fair Value, Total $ 1,491,956 $ 4,480,246
Securities in an unrealized loss position, aggregate loss [Abstract]    
Unrealized Losses, Total 13,438 30,886
Fannie Mae/Freddie Mac [Member]    
Securities in an unrealized loss position, fair value [Abstract]    
One year or greater 766,235 2,030,192
Less than one year 672,510 1,473,144
Securities in an unrealized loss position, aggregate loss [Abstract]    
One year or greater 9,739 17,069
Less than one year 3,248 6,684
Ginnie Mae [Member]    
Securities in an unrealized loss position, fair value [Abstract]    
One year or greater 26,214 560,022
Less than one year 26,997 416,888
Securities in an unrealized loss position, aggregate loss [Abstract]    
One year or greater 265 5,775
Less than one year $ 186 $ 1,358