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Borrowings (Repurchase Agreements) (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Borrowing Balance $ 800,299 $ 1,371,534
Securities Sold under Agreements to Repurchase [Member]    
Debt Instrument [Line Items]    
Borrowing Balance $ 656,635 $ 932,500
Weighted Average Coupon 2.57%  
Securities Sold under Agreements to Repurchase [Member] | Due date: 12 08 2016 [Member]    
Debt Instrument [Line Items]    
Borrowing Balance $ 170,000  
Weighted Average Coupon 1.50%  
Settlement Date Dec. 06, 2012  
Investment Repurchase Agreement, Repurchase Date Dec. 08, 2016  
Securities Sold under Agreements to Repurchase [Member] | Due date: 03 02 2017 [Member]    
Debt Instrument [Line Items]    
Borrowing Balance $ 232,000  
Weighted Average Coupon 4.78%  
Settlement Date Mar. 02, 2007  
Investment Repurchase Agreement, Repurchase Date Mar. 02, 2017  
Securities Sold under Agreements to Repurchase [Member] | Due Date: 04 29 2018 [Member]    
Debt Instrument [Line Items]    
Borrowing Balance $ 212,500  
Weighted Average Coupon 1.42%  
Settlement Date Dec. 10, 2012  
Investment Repurchase Agreement, Repurchase Date Apr. 29, 2018  
Securities Sold under Agreements to Repurchase [Member] | Due Date 10/07/2016 Coupon .57% [Member]    
Debt Instrument [Line Items]    
Borrowing Balance $ 21,635  
Weighted Average Coupon 0.57%  
Settlement Date Sep. 20, 2016  
Investment Repurchase Agreement, Repurchase Date Oct. 07, 2016  
Securities Sold under Agreements to Repurchase [Member] | Due Date 10/07/2016 Coupon .51% [Member]    
Debt Instrument [Line Items]    
Borrowing Balance $ 20,500  
Weighted Average Coupon 0.51%  
Settlement Date Sep. 30, 2016  
Investment Repurchase Agreement, Repurchase Date Oct. 07, 2016