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INVESTMENT SECURITIES (Gross Unrealized Loss and Fair Value of AFS Debt Securities) (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Fair Value    
Less than 12 months $ 1,655,498 $ 3,269,692
12 months or longer 82,196 2,903,310
Unrealized Losses    
Less than 12 months (5,859) (12,994)
12 months or longer (1,505) (36,974)
U.S. Treasury securities    
Fair Value    
Less than 12 months 0 200,096
12 months or longer 0 499,883
Unrealized Losses    
Less than 12 months 0 (167)
12 months or longer 0 (125)
Corporate debt securities    
Fair Value    
Less than 12 months 131,377 110,802
12 months or longer 0 0
Unrealized Losses    
Less than 12 months (15) (22)
12 months or longer 0 0
ABS    
Fair Value    
Less than 12 months 4,013 27,662
12 months or longer 46,649 47,616
Unrealized Losses    
Less than 12 months (17) (44)
12 months or longer (1,273) (1,429)
GNMA - Residential    
Fair Value    
Less than 12 months 51,846 2,053,763
12 months or longer 10,756 997,024
Unrealized Losses    
Less than 12 months (178) (6,895)
12 months or longer (16) (9,171)
GNMA - Commercial    
Fair Value    
Less than 12 months 52,123 217,291
12 months or longer 0 14,300
Unrealized Losses    
Less than 12 months (193) (1,756)
12 months or longer 0 (29)
FHLMC and FNMA - Residential    
Fair Value    
Less than 12 months 1,416,139 660,078
12 months or longer 24,369 1,344,057
Unrealized Losses    
Less than 12 months (5,456) (4,110)
12 months or longer (214) (26,215)
FHLMC and FNMA - Commercial    
Fair Value    
Less than 12 months 0 0
12 months or longer 422 430
Unrealized Losses    
Less than 12 months 0 0
12 months or longer $ (2) $ (5)