Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation and Significant Accounting Policies Offsetting Assets and Liabilities (Details)

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Basis of Presentation and Significant Accounting Policies Offsetting Assets and Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Derivative Financial Instruments, Assets [Member]
    
Offsetting Assets and Liabilities [Line Items]    
Gross Amount of Recognized Assets (Liabilities) $ 723,246 $ 463,027
Gross Amounts Offset on the Balance Sheet (23,895) (947)
Net Amount of Assets (Liabilities) Presented on the Balance Sheet 699,351 462,080
Gross Amounts of Financial Instruments Not Offset on the Balance Sheet (46,028) (129,294)
Gross Amounts of Cash Collateral Not Offset on the Balance Sheet (189,927) 85,798
Net Amount After Deducting Gross Amounts Not Offset on the Balance Sheet From Net Amount of Assets (Liabilities) Presented on the Balance Sheet 463,396 418,584
Assets [Member]
    
Offsetting Assets and Liabilities [Line Items]    
Gross Amount of Recognized Assets (Liabilities) 723,246 463,027
Gross Amounts Offset on the Balance Sheet (23,895) (947)
Net Amount of Assets (Liabilities) Presented on the Balance Sheet 699,351 462,080
Gross Amounts of Financial Instruments Not Offset on the Balance Sheet (46,028) (129,294)
Gross Amounts of Cash Collateral Not Offset on the Balance Sheet (189,927) 85,798
Net Amount After Deducting Gross Amounts Not Offset on the Balance Sheet From Net Amount of Assets (Liabilities) Presented on the Balance Sheet 463,396 418,584
Federal Funds Purchased and Securities Sold under Agreements to Repurchase [Member]
    
Offsetting Assets and Liabilities [Line Items]    
Gross Amount of Recognized Assets (Liabilities) (14,903,155) (12,624,510)
Gross Amounts Offset on the Balance Sheet 0 0
Net Amount of Assets (Liabilities) Presented on the Balance Sheet (14,903,155) (12,624,510)
Gross Amounts of Financial Instruments Not Offset on the Balance Sheet 14,903,155 12,624,510
Gross Amounts of Cash Collateral Not Offset on the Balance Sheet 0 0
Net Amount After Deducting Gross Amounts Not Offset on the Balance Sheet From Net Amount of Assets (Liabilities) Presented on the Balance Sheet 0 0
Derivative Financial Instruments, Liabilities [Member]
    
Offsetting Assets and Liabilities [Line Items]    
Gross Amount of Recognized Assets (Liabilities) (69,923) (130,241)
Gross Amounts Offset on the Balance Sheet 23,895 947
Net Amount of Assets (Liabilities) Presented on the Balance Sheet (46,028) (129,294)
Gross Amounts of Financial Instruments Not Offset on the Balance Sheet 46,028 129,294
Gross Amounts of Cash Collateral Not Offset on the Balance Sheet 0 0
Net Amount After Deducting Gross Amounts Not Offset on the Balance Sheet From Net Amount of Assets (Liabilities) Presented on the Balance Sheet 0 0
Liability [Member]
    
Offsetting Assets and Liabilities [Line Items]    
Gross Amount of Recognized Assets (Liabilities) (14,973,078) (12,754,751)
Gross Amounts Offset on the Balance Sheet 23,895 947
Net Amount of Assets (Liabilities) Presented on the Balance Sheet (14,949,183) (12,753,804)
Gross Amounts of Financial Instruments Not Offset on the Balance Sheet 14,949,183 12,753,804
Gross Amounts of Cash Collateral Not Offset on the Balance Sheet 0 0
Net Amount After Deducting Gross Amounts Not Offset on the Balance Sheet From Net Amount of Assets (Liabilities) Presented on the Balance Sheet $ 0 $ 0