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Borrowings (Securities Sold Under Agreement to Repurchase by Counterparties) (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Debt Instrument [Line Items]    
Borrowings $ 1,437,705 $ 1,420,006
Securities Sold under Agreements to Repurchase [Member]    
Debt Instrument [Line Items]    
Borrowings 998,532 977,816
Fair Value of Underlying Collateral 1,099,378 1,088,525
Securities Sold under Agreements to Repurchase [Member] | Jp Morgan Chase Bank Na [Member]    
Debt Instrument [Line Items]    
Borrowings 328,532 670,000
Fair Value of Underlying Collateral 354,353 328,198
Securities Sold under Agreements to Repurchase [Member] | Credit Suisse Securities LLC [Member]    
Debt Instrument [Line Items]    
Borrowings 670,000 307,816
Fair Value of Underlying Collateral $ 745,025 $ 760,327