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Borrowings (Securities Sold Under Agreement to Repurchase by Counterparties) (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Borrowings $ 1,037,325 $ 1,371,534
Securities Sold under Agreements to Repurchase [Member]    
Debt Instrument [Line Items]    
Borrowings 624,500 932,500
Fair Value of Underlying Collateral 668,689 1,021,370
Securities Sold under Agreements to Repurchase [Member] | Jp Morgan Chase Bank Na [Member]    
Debt Instrument [Line Items]    
Borrowings 222,500 262,500
Fair Value of Underlying Collateral 231,586 283,483
Securities Sold under Agreements to Repurchase [Member] | Credit Suisse Securities LLC [Member]    
Debt Instrument [Line Items]    
Borrowings 402,000 670,000
Fair Value of Underlying Collateral $ 437,103 $ 737,887