Quarterly report pursuant to Section 13 or 15(d)

Derivative Financial Instruments (BS Offsetting) (Details 4)

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Derivative Financial Instruments (BS Offsetting) (Details 4) (Deriviative Contract [Member], USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Deriviative Contract [Member]
   
Derivative Asset, Fair Value, Amount Offset Against Collateral [Abstract]    
Cash collateral received $ (322) $ (755)
Derivative Assets [Abstract]    
Gross amounts offset in the statement of financial position 103,945 101,620
Gross amounts not offset in the statement of financial position - financial instruments 30,889 62,409
Derivative Assets 176,424 308,590
Derivative Asset, Fair Value, Net [Abstract]    
Gross amounts of recognized assets 311,580 473,374
Net amounts of assets presented in the statement of financial position 207,635 371,754
Derivative Liability, Fair Value, Amount Offset Against Collateral [Abstract]    
Cash collateral given 1,595 (455)
Derivative Liabilities [Abstract]    
Gross amounts offset in the statement of financial position (69,008) (85,667)
Gross amounts not offset in the statement of financial position - financial instruments 100,522 97,233
Derivative Liabilities 19,831 52,309
Derivative Liability, Fair Value, Net [Abstract]    
Gross amounts of recognized liabilities 187,766 235,664
Net amounts of assets presented in the statement of financial position $ 118,758 $ 149,997