Quarterly report pursuant to Section 13 or 15(d)

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

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Derivative Instruments and Hedging Activities Schedule of Interest Rate Swap Receivers 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], Short [Member], USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Derivative [Line Items]    
Derivative, Notional Amount $ 1,494,148 $ 1,099,000
Derivative Maturity Over Four Years From Balance Sheet Date [Member]
   
Derivative [Line Items]    
Derivative, Notional Amount $ 1,494,148 $ 1,099,000
Derivative, Average Variable Interest Rate 0.235% 0.242%
Derivative, Average Fixed Interest Rate 2.463% 2.914%
Derivative, Weighted Average Remaining Maturity 7.828 9.944