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Borrowings under Repurchase Agreements (Details 2) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
item
Certain characteristics of the Company's repurchase agreements    
Total $ 3,961,629 $ 4,794,730
Number of linked transactions   0
Linked Transactions
   
Certain characteristics of the Company's repurchase agreements    
Total 3,300  
Overnight
   
Certain characteristics of the Company's repurchase agreements    
Total 66,083  
2 to 29 days
   
Certain characteristics of the Company's repurchase agreements    
Total 2,108,710  
30 to 59 days
   
Certain characteristics of the Company's repurchase agreements    
Total 1,401,570  
60 to 89 days
   
Certain characteristics of the Company's repurchase agreements    
Total $ 385,266