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Borrowings (Repurchase Agreements) (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Debt Instrument [Line Items]    
Borrowing Balance $ 1,437,705 $ 1,420,006
Securities Sold under Agreements to Repurchase [Member]    
Debt Instrument [Line Items]    
Borrowing Balance $ 998,532 $ 977,816
Weighted Average Coupon 2.921%  
Securities Sold under Agreements to Repurchase [Member] | Due Date: 10 1 2015 [Member]    
Debt Instrument [Line Items]    
Borrowing Balance $ 57,400  
Weighted Average Coupon 0.50%  
Settlement Date Aug. 20, 2015  
Investment Repurchase Agreement, Repurchase Date Oct. 01, 2015  
Securities Sold under Agreements to Repurchase [Member] | Due Date: 10 22 2015 [Member]    
Debt Instrument [Line Items]    
Borrowing Balance $ 31,132  
Weighted Average Coupon 0.47%  
Settlement Date Sep. 22, 2015  
Investment Repurchase Agreement, Repurchase Date Oct. 22, 2015  
Securities Sold under Agreements to Repurchase [Member] | Due date: 12 8 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: 9 30 2016 [Member]    
Debt Instrument [Line Items]    
Borrowing Balance $ 240,000  
Weighted Average Coupon 0.95%  
Settlement Date Dec. 10, 2012  
Investment Repurchase Agreement, Repurchase Date Sep. 30, 2016  
Securities Sold under Agreements to Repurchase [Member] | Due date: 3 2 2017 [Member]    
Debt Instrument [Line Items]    
Borrowing Balance $ 500,000  
Weighted Average Coupon 4.78%  
Settlement Date Mar. 02, 2007  
Investment Repurchase Agreement, Repurchase Date Mar. 02, 2017