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Borrowings (Repurchase Agreements) (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Borrowing Balance $ 627,292 $ 795,354
Securities Sold under Agreements to Repurchase [Member]    
Debt Instrument [Line Items]    
Borrowing Balance $ 452,850 $ 652,229
Weighted Average Coupon 1.56%  
Securities Sold under Agreements to Repurchase [Member] | Due date: 7/3/2017 [Member]    
Debt Instrument [Line Items]    
Borrowing Balance $ 37,001  
Weighted Average Coupon 1.65%  
Settlement Date Jun. 27, 2017  
Investment Repurchase Agreement, Repurchase Date Jul. 03, 2017  
Securities Sold under Agreements to Repurchase [Member] | Due Date: 7/5/2017 [Member]    
Debt Instrument [Line Items]    
Borrowing Balance $ 57,281  
Weighted Average Coupon 1.55%  
Settlement Date Jun. 28, 2017  
Investment Repurchase Agreement, Repurchase Date Jul. 05, 2017  
Securities Sold under Agreements to Repurchase [Member] | Due Date: 7/7/2017 [Member]    
Debt Instrument [Line Items]    
Borrowing Balance $ 66,068  
Weighted Average Coupon 1.50%  
Settlement Date Jun. 28, 2017  
Investment Repurchase Agreement, Repurchase Date Jul. 07, 2017  
Securities Sold under Agreements to Repurchase [Member] | Due Date: 04 29 2018 [Member]    
Debt Instrument [Line Items]    
Borrowing Balance $ 182,500  
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: 09 03 2019 [Member]    
Debt Instrument [Line Items]    
Borrowing Balance $ 50,000  
Weighted Average Coupon 1.72%  
Settlement Date Mar. 02, 2017  
Investment Repurchase Agreement, Repurchase Date Sep. 03, 2019  
Securities Sold under Agreements to Repurchase [Member] | Due Date: 3/2/2020 [Member]    
Debt Instrument [Line Items]    
Borrowing Balance $ 60,000  
Weighted Average Coupon 1.85%  
Settlement Date Mar. 02, 2017  
Investment Repurchase Agreement, Repurchase Date Mar. 02, 2020