Annual report pursuant to Section 13 and 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
Dec. 31, 2013
Dec. 31, 2012
Federal Funds Purchased and Securities Sold under Agreements to Repurchase [Member]
    
Offsetting Assets and Liabilities [Line Items]    
Gross Amount of Recognized Assets (Liabilities) $ (12,250,450) $ (12,624,510)
Gross Amounts Offset in the Consolidated Balance Sheets 0 0
Net Amount of Assets (Liabilities) Presented in the Consolidated Balance Sheets (12,250,450) (12,624,510)
Gross Amounts of Financial Instruments Not Offset in the Consolidated Balance Sheets 12,250,450 12,624,510
Gross Amounts of Cash Collateral Not Offset in the Consolidated Balance Sheets 0 0
Net Amount 0 0
Derivative Financial Instruments, Liabilities [Member]
    
Offsetting Assets and Liabilities [Line Items]    
Gross Amount of Recognized Assets (Liabilities) (44,272) (130,241)
Gross Amounts Offset in the Consolidated Balance Sheets 22,191 947
Net Amount of Assets (Liabilities) Presented in the Consolidated Balance Sheets (22,081) (129,294)
Gross Amounts of Financial Instruments Not Offset in the Consolidated Balance Sheets 22,081 129,294
Gross Amounts of Cash Collateral Not Offset in the Consolidated Balance Sheets 0 0
Net Amount 0 0
Liability [Member]
    
Offsetting Assets and Liabilities [Line Items]    
Gross Amount of Recognized Assets (Liabilities) (12,294,722) (12,754,751)
Gross Amounts Offset in the Consolidated Balance Sheets 22,191 947
Net Amount of Assets (Liabilities) Presented in the Consolidated Balance Sheets (12,272,531) (12,753,804)
Gross Amounts of Financial Instruments Not Offset in the Consolidated Balance Sheets 12,272,531 12,753,804
Gross Amounts of Cash Collateral Not Offset in the Consolidated Balance Sheets 0 0
Net Amount 0 0
Derivative Financial Instruments, Assets [Member]
    
Offsetting Assets and Liabilities [Line Items]    
Gross Amount of Recognized Assets (Liabilities) 572,050 463,027
Gross Amounts Offset in the Consolidated Balance Sheets (22,191) (947)
Net Amount of Assets (Liabilities) Presented in the Consolidated Balance Sheets 549,859 462,080
Gross Amounts of Financial Instruments Not Offset in the Consolidated Balance Sheets (22,081) (129,294)
Gross Amounts of Cash Collateral Not Offset in the Consolidated Balance Sheets 0 85,798
Net Amount 527,778 418,584
Assets [Member]
    
Offsetting Assets and Liabilities [Line Items]    
Gross Amount of Recognized Assets (Liabilities) 572,050 463,027
Gross Amounts Offset in the Consolidated Balance Sheets (22,191) (947)
Net Amount of Assets (Liabilities) Presented in the Consolidated Balance Sheets 549,859 462,080
Gross Amounts of Financial Instruments Not Offset in the Consolidated Balance Sheets (22,081) (129,294)
Gross Amounts of Cash Collateral Not Offset in the Consolidated Balance Sheets 0 85,798
Net Amount $ 527,778 $ 418,584