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Borrowings (Repurchase Agreements) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Borrowing Balance $ 354,337 $ 328,748
Securities Sold under Agreements to Repurchase [Member]    
Debt Instrument [Line Items]    
Borrowing Balance $ 273,500 $ 192,500
Weighted Average Coupon 1.96%  
Securities Sold under Agreements to Repurchase [Member] | Due date: 4/4/2018 [Member]    
Debt Instrument [Line Items]    
Borrowing Balance $ 11,000  
Weighted Average Coupon 2.15%  
Settlement Date Mar. 28, 2018  
Investment Repurchase Agreement, Repurchase Date Apr. 04, 2018  
Securities Sold under Agreements to Repurchase [Member] | Due Date: 3/15/2020 [Member]    
Debt Instrument [Line Items]    
Borrowing Balance $ 50,000  
Weighted Average Coupon 2.61%  
Settlement Date Mar. 15, 2018  
Investment Repurchase Agreement, Repurchase Date Mar. 15, 2020  
Securities Sold under Agreements to Repurchase [Member] | Due Date: 3/23/2020 [Member]    
Debt Instrument [Line Items]    
Borrowing Balance $ 30,000  
Weighted Average Coupon 2.70%  
Settlement Date Mar. 23, 2018  
Investment Repurchase Agreement, Repurchase Date Mar. 23, 2020  
Securities Sold under Agreements to Repurchase [Member] | Due Date: 04 29 2018 [Member]    
Debt Instrument [Line Items]    
Borrowing Balance $ 72,500  
Weighted Average Coupon 1.52%  
Settlement Date Dec. 30, 2015  
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