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Borrowings (Securities Sold Under Agreement to Repurchase by Counterparties) (Details) - USD ($)
Mar. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Borrowings $ 1,072,716,000 $ 1,371,534,000
Securities Sold under Agreements to Repurchase [Member]    
Debt Instrument [Line Items]    
Borrowings 634,500,000 932,500,000
Fair Value of Underlying Collateral 691,940,000 1,021,370,000
Securities Sold under Agreements to Repurchase [Member] | Jp Morgan Chase Bank Na [Member]    
Debt Instrument [Line Items]    
Borrowings 232,500,000 262,500,000
Fair Value of Underlying Collateral 252,402,000 283,483,000
Securities Sold under Agreements to Repurchase [Member] | Credit Suisse Securities LLC [Member]    
Debt Instrument [Line Items]    
Borrowings 402,000,000 670,000,000
Fair Value of Underlying Collateral $ 439,538,000 $ 737,887,000