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SECURED BORROWINGS (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Dec. 31, 2015
Jun. 30, 2016
Jun. 30, 2015
Secured Borrowings, Including Interest Rate Hedging Activity [Line Items]        
Proceeds from sale of federal home loan bank stock     $ 30,000 $ 0
Total collateral carrying amount $ 13,480,000 $ 13,540,000 13,480,000  
Total borrowings outstanding 12,802,629 12,958,394 $ 12,802,629  
Average borrowings for the effects of related derivatives held as cash flow hedges $ 12,866,495 $ 13,160,703    
Effective borrowing rate considering cash flow hedges 0.84% 0.73% 0.84%  
Quarter-End Borrowing Rates Adjusted for Effects of Related Derivative Financial Instruments ("Derivatives") Held as Cash Flow Hedges [Member]        
Secured Borrowings, Including Interest Rate Hedging Activity [Line Items]        
Average borrowing rates 0.84%   0.84%  
Year-End Borrowing Rates Adjusted for Effects of Related Derivatives Held as Cash Flow Hedges [Member]        
Secured Borrowings, Including Interest Rate Hedging Activity [Line Items]        
Average borrowing rates   0.85%    
FHLB Advances [Member]        
Secured Borrowings, Including Interest Rate Hedging Activity [Line Items]        
Proceeds from sale of federal home loan bank stock     $ 30,000  
Investment in federal home loan bank stock $ 30,000   30,000  
Collateral carrying amount for FHLB advances 775,991 $ 2,956,908 775,991  
Accrued interest receivable 3,218 11,422 3,218  
Borrowings outstanding for FHLB advance $ 750,000 $ 2,875,000 $ 750,000  
Average borrowing rates 0.64% 0.43% 0.64%  
Agency Securities [Member]        
Secured Borrowings, Including Interest Rate Hedging Activity [Line Items]        
Collateral carrying amount $ 12,704,204 $ 10,579,208 $ 12,704,204  
Accrued interest receivable 27,165 21,884 27,165  
Borrowings outstanding 12,052,629 10,083,394 12,052,629  
Agency Securities [Member] | Borrowings with Maturities of 30 Days or Less [Member]        
Secured Borrowings, Including Interest Rate Hedging Activity [Line Items]        
Collateral carrying amount 11,881,413 9,080,363 11,881,413  
Accrued interest receivable 25,232 18,504 25,232  
Borrowings outstanding $ 11,092,153 $ 8,585,336 $ 11,092,153  
Average borrowing rates 0.66% 0.67% 0.66%  
Agency Securities [Member] | Borrowings with Maturities of 31 to 90 Days [Member]        
Secured Borrowings, Including Interest Rate Hedging Activity [Line Items]        
Collateral carrying amount $ 738,471 $ 423,710 $ 738,471  
Accrued interest receivable 1,556 861 1,556  
Borrowings outstanding $ 408,711 $ 346,177 $ 408,711  
Average borrowing rates 0.72% 0.63% 0.72%  
Agency Securities [Member] | Borrowings with Maturities Greater than 90 Days [Member]        
Secured Borrowings, Including Interest Rate Hedging Activity [Line Items]        
Collateral carrying amount $ 82,555 $ 1,073,254 $ 82,555  
Accrued interest receivable 377 2,519 377  
Borrowings outstanding $ 550,000 $ 1,150,000 $ 550,000  
Average borrowing rates 0.82% 0.75% 0.82%  
Agency Securities [Member] | Similar Borrowings [Member]        
Secured Borrowings, Including Interest Rate Hedging Activity [Line Items]        
Collateral carrying amount $ 1,765 $ 1,881 $ 1,765  
Accrued interest receivable 0 0 0  
Borrowings outstanding $ 1,765 $ 1,881 $ 1,765  
Average borrowing rates 8.12% 8.12% 8.12%  
Agency Securities [Member] | FHLB Advances [Member]        
Secured Borrowings, Including Interest Rate Hedging Activity [Line Items]        
Total collateral carrying amount $ 13,480,195 $ 13,536,116 $ 13,480,195  
Accrued interest receivable 30,383 33,306 30,383  
Total borrowings outstanding $ 12,802,629 $ 12,958,394 $ 12,802,629  
Average borrowing rates 0.67% 0.62% 0.67%