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Offsetting Arrangement (Liabilities Offsetting) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Offsetting Liabilities [Line Items]    
Gross amount of Recognized Liabilities $ 1,035,950 $ 1,295,672
Gross amount Offset in the Statement of Financial Condition 0 0
Net Amount of Liabilities Presented in the Statement of Financial Condition 1,035,950 1,295,672
Financial Instruments 1,133,922 1,277,919
Cash Collateral Provided 2,980 69,378
Net Amount (100,952) (51,625)
Derivative Financial Instruments, Liabilities [Member]
    
Offsetting Liabilities [Line Items]    
Gross amount of Recognized Liabilities 25,950 30,672
Gross amount Offset in the Statement of Financial Condition 0 0
Net Amount of Liabilities Presented in the Statement of Financial Condition 25,950 30,672
Financial Instruments 0 0
Cash Collateral Provided 2,980 2,349
Net Amount 22,970 28,323
Securities Loaned or Sold under Agreements to Repurchase
    
Offsetting Liabilities [Line Items]    
Gross amount of Recognized Liabilities 1,010,000 1,265,000
Gross amount Offset in the Statement of Financial Condition 0 0
Net Amount of Liabilities Presented in the Statement of Financial Condition 1,010,000 1,265,000
Financial Instruments 1,133,922 1,277,919
Cash Collateral Provided 0 67,029
Net Amount $ (123,922) $ (79,948)