Annual report pursuant to Section 13 and 15(d)

Derivative Instruments and Hedging Activities Schedule of Interest Rate Swaps Associated with Repurchase Agreements (Details)

v2.4.0.8
Derivative Instruments and Hedging Activities Schedule of Interest Rate Swaps Associated with Repurchase Agreements (Details) (Interest Rate Swaps Associated with Repurchase Agreements [Member], USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Derivative [Line Items]    
Derivative, Notional Amount $ 14,425,000 $ 12,570,000
Derivative, Average Fixed Interest Rate 0.698% 0.85%
Derivative, Average Variable Interest Rate 0.235% 0.315%
Derivative, Weighted Average Remaining Maturity 2.501 2.847
Derivative Maturity Within One Year From Balance Sheet Date [Member]
    
Derivative [Line Items]    
Derivative, Notional Amount 3,900,000 2,275,000
Derivative, Average Fixed Interest Rate 0.30% 0.713%
Derivative, Average Variable Interest Rate 0.245% 0.315%
Derivative, Weighted Average Remaining Maturity .764 .558
Derivative Maturity Over One And Within Two Years From Balance Sheet Date [Member]
    
Derivative [Line Items]    
Derivative, Notional Amount 1,000,000 1,675,000
Derivative, Average Fixed Interest Rate 0.383% 0.644%
Derivative, Average Variable Interest Rate 0.244% 0.311%
Derivative, Weighted Average Remaining Maturity 1.044 1.566
Derivative Maturity Over Two And Within Three Years From Balance Sheet Date [Member]
    
Derivative [Line Items]    
Derivative, Notional Amount 2,950,000 2,770,000
Derivative, Average Fixed Interest Rate 0.626% 0.908%
Derivative, Average Variable Interest Rate 0.246% 0.313%
Derivative, Weighted Average Remaining Maturity 2.417 2.427
Derivative Maturity Over Three And Within Four Years From Balance Sheet Date [Member]
    
Derivative [Line Items]    
Derivative, Notional Amount 5,300,000 1,940,000
Derivative, Average Fixed Interest Rate 0.92% 0.874%
Derivative, Average Variable Interest Rate 0.217% 0.323%
Derivative, Weighted Average Remaining Maturity 3.49 3.456
Derivative Maturity Over Four Years From Balance Sheet Date [Member]
    
Derivative [Line Items]    
Derivative, Notional Amount $ 1,275,000 $ 3,910,000
Derivative, Average Fixed Interest Rate 1.406% 0.96%
Derivative, Average Variable Interest Rate 0.242% 0.313%
Derivative, Weighted Average Remaining Maturity 5.041 4.723