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DEBT AND OTHER OBLIGATIONS - Remaining Contractual Maturity of the Agreements (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Debt Instrument [Line Items]      
Repurchase agreements and repurchase-to-maturity transactions $ 451,895  
Securities lending transactions 72,176 125,271 $ 72,200
Total securities 524,071 1,131,878  
Overnight and Continuous      
Debt Instrument [Line Items]      
Repurchase agreements and repurchase-to-maturity transactions 433,182  
Securities lending transactions 72,176 125,271  
Total securities 505,358 1,131,878  
Up to 30 days      
Debt Instrument [Line Items]      
Repurchase agreements and repurchase-to-maturity transactions 18,713  
Securities lending transactions 0 0  
Total securities 18,713 0  
30 - 90 days      
Debt Instrument [Line Items]      
Repurchase agreements and repurchase-to-maturity transactions 0  
Securities lending transactions 0 0  
Total securities 0 0  
Greater than 90 Days      
Debt Instrument [Line Items]      
Repurchase agreements and repurchase-to-maturity transactions 0  
Securities lending transactions 0 0  
Total securities 0 0  
U.S. Treasury and agency securities      
Debt Instrument [Line Items]      
Repurchase agreements and repurchase-to-maturity transactions 451,895 307,633  
U.S. Treasury and agency securities | Overnight and Continuous      
Debt Instrument [Line Items]      
Repurchase agreements and repurchase-to-maturity transactions 433,182 307,633  
U.S. Treasury and agency securities | Up to 30 days      
Debt Instrument [Line Items]      
Repurchase agreements and repurchase-to-maturity transactions 18,713 0  
U.S. Treasury and agency securities | 30 - 90 days      
Debt Instrument [Line Items]      
Repurchase agreements and repurchase-to-maturity transactions 0 0  
U.S. Treasury and agency securities | Greater than 90 Days      
Debt Instrument [Line Items]      
Repurchase agreements and repurchase-to-maturity transactions 0 0  
Mortgage loans      
Debt Instrument [Line Items]      
Repurchase agreements and repurchase-to-maturity transactions 0 1,006,607  
Mortgage loans | Overnight and Continuous      
Debt Instrument [Line Items]      
Repurchase agreements and repurchase-to-maturity transactions 0 1,006,607  
Mortgage loans | Up to 30 days      
Debt Instrument [Line Items]      
Repurchase agreements and repurchase-to-maturity transactions 0 0  
Mortgage loans | 30 - 90 days      
Debt Instrument [Line Items]      
Repurchase agreements and repurchase-to-maturity transactions 0 0  
Mortgage loans | Greater than 90 Days      
Debt Instrument [Line Items]      
Repurchase agreements and repurchase-to-maturity transactions 0 0  
Corporate Debt Securities      
Debt Instrument [Line Items]      
Securities lending transactions 71,285 118,817  
Corporate Debt Securities | Overnight and Continuous      
Debt Instrument [Line Items]      
Securities lending transactions 71,285 118,817  
Corporate Debt Securities | Up to 30 days      
Debt Instrument [Line Items]      
Securities lending transactions 0 0  
Corporate Debt Securities | 30 - 90 days      
Debt Instrument [Line Items]      
Securities lending transactions 0 0  
Corporate Debt Securities | Greater than 90 Days      
Debt Instrument [Line Items]      
Securities lending transactions 0 0  
Equity securities      
Debt Instrument [Line Items]      
Securities lending transactions 891 5,699  
Equity securities | Overnight and Continuous      
Debt Instrument [Line Items]      
Securities lending transactions 891 5,699  
Equity securities | Up to 30 days      
Debt Instrument [Line Items]      
Securities lending transactions 0 0  
Equity securities | 30 - 90 days      
Debt Instrument [Line Items]      
Securities lending transactions 0 0  
Equity securities | Greater than 90 Days      
Debt Instrument [Line Items]      
Securities lending transactions 0 0  
Redeemable preferred stock      
Debt Instrument [Line Items]      
Securities lending transactions 0 755  
Redeemable preferred stock | Overnight and Continuous      
Debt Instrument [Line Items]      
Securities lending transactions 0 755  
Redeemable preferred stock | Up to 30 days      
Debt Instrument [Line Items]      
Securities lending transactions 0 0  
Redeemable preferred stock | 30 - 90 days      
Debt Instrument [Line Items]      
Securities lending transactions 0 0  
Redeemable preferred stock | Greater than 90 Days      
Debt Instrument [Line Items]      
Securities lending transactions $ 0 0  
Corporate Debt Securities      
Debt Instrument [Line Items]      
Repurchase agreements and repurchase-to-maturity transactions   698,974  
Corporate Debt Securities | Overnight and Continuous      
Debt Instrument [Line Items]      
Repurchase agreements and repurchase-to-maturity transactions   698,974  
Corporate Debt Securities | Up to 30 days      
Debt Instrument [Line Items]      
Repurchase agreements and repurchase-to-maturity transactions   0  
Corporate Debt Securities | 30 - 90 days      
Debt Instrument [Line Items]      
Repurchase agreements and repurchase-to-maturity transactions   0  
Corporate Debt Securities | Greater than 90 Days      
Debt Instrument [Line Items]      
Repurchase agreements and repurchase-to-maturity transactions   $ 0