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SECURED FINANCING - Additional Information (Details) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Repurchase Agreements:    
Netted amounts $ 67,163,598 $ 101,740,728 [1]
Repurchase agreements - weighted average effective borrowing rates 0.70% 1.99%
Repurchase agreements - weighted average remaining maturities 74 days 65 days
Repurchase agreement amount $ 2,100,000  
Remaining capacity of repurchase agreement 1,700,000  
Other secured financing long term, amount 1,538,996 $ 4,455,700 [1]
Secured financings and interest rate swaps - collateral held, estimated fair value 74,300,000 112,800,000
Secured financings and interest rate swaps - collateral held, accrued interest $ 225,800 $ 357,900
Minimum    
Repurchase Agreements:    
Maturity period (in years) 5 years  
Maximum    
Repurchase Agreements:    
Maturity period (in years) 7 years  
Maturity Period Beyond Three Years | Period One | Maximum    
Repurchase Agreements:    
Maturity period (in years) 1 year 1 year
Maturity Period Beyond Three Years | Period Two | Minimum    
Repurchase Agreements:    
Maturity period (in years)   1 year
Maturity Period Beyond Three Years | Period Two | Maximum    
Repurchase Agreements:    
Maturity period (in years)   3 years
FHLB De Moines    
Repurchase Agreements:    
Debt weighted average interest rate 1.55% 2.16%
Stock held in FHLB $ 28,800 $ 147,900
FHLB De Moines | Maturity Period Beyond Three Years | Period One    
Repurchase Agreements:    
Other secured financing long term, amount $ 600,000 1,400,000
FHLB De Moines | Maturity Period Beyond Three Years | Period Two    
Repurchase Agreements:    
Other secured financing long term, amount   $ 2,100,000
[1]
Derived from the audited consolidated financial statements at December 31, 2019.