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INVESTMENT SECURITIES (Gross Unrealized Loss and Fair Value of AFS Debt Securities) (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Fair Value    
Less than 12 months $ 755,910 $ 3,269,692
12 months or longer 93,894 2,903,310
Unrealized Losses    
Less than 12 months (1,286) (12,994)
12 months or longer (1,686) (36,974)
U.S. Treasury securities    
Fair Value    
Less than 12 months 139,982 200,096
12 months or longer 0 499,883
Unrealized Losses    
Less than 12 months (1) (167)
12 months or longer 0 (125)
Corporate debt securities    
Fair Value    
Less than 12 months 56,893 110,802
12 months or longer 0 0
Unrealized Losses    
Less than 12 months (13) (22)
12 months or longer 0 0
ABS    
Fair Value    
Less than 12 months 12,779 27,662
12 months or longer 38,538 47,616
Unrealized Losses    
Less than 12 months (69) (44)
12 months or longer (1,260) (1,429)
GNMA - Residential    
Fair Value    
Less than 12 months 21,157 2,053,763
12 months or longer 28,479 997,024
Unrealized Losses    
Less than 12 months (26) (6,895)
12 months or longer (135) (9,171)
GNMA - Commercial    
Fair Value    
Less than 12 months 0 217,291
12 months or longer 0 14,300
Unrealized Losses    
Less than 12 months 0 (1,756)
12 months or longer 0 (29)
FHLMC and FNMA - Residential    
Fair Value    
Less than 12 months 525,099 660,078
12 months or longer 26,452 1,344,057
Unrealized Losses    
Less than 12 months (1,177) (4,110)
12 months or longer (288) (26,215)
FHLMC and FNMA - Commercial    
Fair Value    
Less than 12 months 0 0
12 months or longer 425 430
Unrealized Losses    
Less than 12 months 0 0
12 months or longer $ (3) $ (5)