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SECURED BORROWINGS (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 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 13,290,000 $ 13,540,000  
Average borrowings for the effects of related derivatives held as cash flow hedges $ 13,042,541 $ 13,160,703  
Effective borrowing rate considering cash flow hedges 0.82% 0.73%  
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%    
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]      
Investment in federal home loan bank stock $ 30,000    
Proceeds from sale of federal home loan bank stock 30,000    
Collateral carrying amount for FHLB advances 768,513 $ 2,956,908  
Accrued interest receivable 3,152 11,422  
Borrowings outstanding for FHLB advance $ 750,000 $ 2,875,000  
Average borrowing rates 0.64% 0.43%  
Agency Securities [Member]      
Secured Borrowings, Including Interest Rate Hedging Activity [Line Items]      
Collateral carrying amount $ 12,517,556 $ 10,579,208  
Accrued interest receivable 26,661 21,884  
Borrowings outstanding 11,873,699 10,083,394  
Agency Securities [Member] | Borrowings with Maturities of 30 Days or Less [Member]      
Secured Borrowings, Including Interest Rate Hedging Activity [Line Items]      
Collateral carrying amount 10,815,418 9,080,363  
Accrued interest receivable 22,692 18,504  
Borrowings outstanding $ 10,267,015 $ 8,585,336  
Average borrowing rates 0.66% 0.67%  
Agency Securities [Member] | Borrowings with Maturities of 31 to 90 Days [Member]      
Secured Borrowings, Including Interest Rate Hedging Activity [Line Items]      
Collateral carrying amount $ 500,212 $ 423,710  
Accrued interest receivable 1,150 861  
Borrowings outstanding $ 461,665 $ 346,177  
Average borrowing rates 0.67% 0.63%  
Agency Securities [Member] | Borrowings with Maturities Greater than 90 Days [Member]      
Secured Borrowings, Including Interest Rate Hedging Activity [Line Items]      
Collateral carrying amount $ 1,200,086 $ 1,073,254  
Accrued interest receivable 2,819 2,519  
Borrowings outstanding $ 1,143,179 $ 1,150,000  
Average borrowing rates 0.79% 0.75%  
Agency Securities [Member] | Similar Borrowings [Member]      
Secured Borrowings, Including Interest Rate Hedging Activity [Line Items]      
Collateral carrying amount $ 1,840 $ 1,881  
Accrued interest receivable 0 0  
Borrowings outstanding $ 1,840 $ 1,881  
Average borrowing rates 8.12% 8.12%  
Agency Securities [Member] | FHLB Advances [Member]      
Secured Borrowings, Including Interest Rate Hedging Activity [Line Items]      
Total collateral carrying amount $ 13,286,069 $ 13,536,116  
Accrued interest receivable 29,813 33,306  
Borrowings outstanding $ 12,623,699 $ 12,958,394  
Average borrowing rates 0.67% 0.62%