Quarterly report pursuant to Section 13 or 15(d)

Derivative Instruments and Hedging Activities Schedule of Interest Rate Swap Payers Associated with Available-for-Sale Securities (Details)

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Derivative Instruments and Hedging Activities Schedule of Interest Rate Swap Payers Associated with Available-for-Sale Securities (Details) (Interest Rate Risk Associated with Available-for-Sale Securities, Mortgage Loans Held-for-Sale and Forward Purchase Commitments [Member], Interest Rate Swap [Member], Long [Member], USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Derivative [Line Items]    
Derivative, Notional Amount $ 1,920,000 $ 2,040,000
Derivative Maturity Over Four Years From Balance Sheet Date [Member]
   
Derivative [Line Items]    
Derivative, Notional Amount $ 1,920,000 $ 2,040,000
Derivative, Average Fixed Interest Rate 1.946% 1.563%
Derivative, Average Variable Interest Rate 0.235% 0.241%
Derivative, Weighted Average Remaining Maturity 5.771 4.944