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
Jun. 30, 2013
Dec. 31, 2012
Deriviative Contract [Member]
   
Derivative Asset, Fair Value, Amount Offset Against Collateral [Abstract]    
Cash collateral received $ (7,424) $ (755)
Derivative Assets [Abstract]    
Gross amounts offset in the statement of financial position (106,107) (101,620)
Gross amounts not offset in the statement of financial position - financial instruments (38,509) (62,409)
Derivative Assets 172,888 308,590
Derivative Asset, Fair Value, Net [Abstract]    
Gross amounts of recognized assets 324,928 473,374
Net amounts of assets presented in the statement of financial position 218,821 371,754
Derivative Liability, Fair Value, Amount Offset Against Collateral [Abstract]    
Cash collateral given (4,116) (455)
Derivative Liabilities [Abstract]    
Gross amounts offset in the statement of financial position (92,072) (85,667)
Gross amounts not offset in the statement of financial position - financial instruments (112,279) (97,233)
Derivative Liabilities 17,021 52,309
Derivative Liability, Fair Value, Net [Abstract]    
Gross amounts of recognized liabilities 225,488 235,664
Net amounts of assets presented in the statement of financial position $ 133,416 $ 149,997