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Borrowings (Securities Sold Under Agreement to Repurchase by Counterparties) (Details) - USD ($)
Dec. 31, 2015
Dec. 31, 2014
Debt Instrument [Line Items]    
Borrowings $ 1,371,534,000 $ 1,420,006,000
Securities Sold under Agreements to Repurchase [Member]    
Debt Instrument [Line Items]    
Borrowings 932,500,000 977,816,000
Fair Value of Underlying Collateral 1,021,370,000 1,088,525,000
Securities Sold under Agreements to Repurchase [Member] | Jp Morgan Chase Bank Na [Member]    
Debt Instrument [Line Items]    
Borrowings 262,500,000 307,816,000
Fair Value of Underlying Collateral 283,483,000 328,198,000
Securities Sold under Agreements to Repurchase [Member] | Credit Suisse Securities LLC [Member]    
Debt Instrument [Line Items]    
Borrowings 670,000,000 670,000,000
Fair Value of Underlying Collateral $ 737,887,000 $ 760,327,000