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
Jun. 30, 2015
Dec. 31, 2014
Derivative Asset, Fair Value, Amount Offset Against Collateral [Abstract]    
Cash collateral received $ (3,688) $ (1,095)
Derivative Assets [Abstract]    
Gross amounts offset in the statement of financial position 115,745 128,161
Gross amounts not offset in the statement of financial position - financial instruments 38,544 27,744
Derivative Assets 335,397 323,803
Derivative Asset, Fair Value, Net [Abstract]    
Gross amounts of recognized assets 493,374 480,803
Net amounts of assets presented in the statement of financial position 377,629 352,642
Derivative Liability, Fair Value, Amount Offset Against Collateral [Abstract]    
Cash collateral given (268) (111)
Derivative Liabilities [Abstract]    
Gross amounts offset in the statement of financial position (39,335) (78,937)
Gross amounts not offset in the statement of financial position - financial instruments 59,024 78,654
Derivative Liabilities 233,852 205,490
Derivative Liability, Fair Value, Net [Abstract]    
Gross amounts of recognized liabilities 332,479 363,192
Net amounts of assets presented in the statement of financial position $ 293,144 $ 284,255