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
Mar. 31, 2014
Dec. 31, 2013
Derivative Financial Instruments, Assets [Member]
    
Offsetting Assets and Liabilities [Line Items]    
Gross Amount of Recognized Assets (Liabilities) $ 431,013 $ 572,050
Gross Amounts Offset on the Balance Sheet (1,594) (22,191)
Net Amount of Assets (Liabilities) Presented on the Balance Sheet 429,419 549,859
Gross Amounts of Financial Instruments Not Offset on the Balance Sheet (8,395) (22,081)
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 421,024 527,778
Assets [Member]
    
Offsetting Assets and Liabilities [Line Items]    
Gross Amount of Recognized Assets (Liabilities) 431,013 572,050
Gross Amounts Offset on the Balance Sheet (1,594) (22,191)
Net Amount of Assets (Liabilities) Presented on the Balance Sheet 429,419 549,859
Gross Amounts of Financial Instruments Not Offset on the Balance Sheet (8,395) (22,081)
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 421,024 527,778
Federal Funds Purchased and Securities Sold under Agreements to Repurchase [Member]
    
Offsetting Assets and Liabilities [Line Items]    
Gross Amount of Recognized Assets (Liabilities) (12,021,177) (12,250,450)
Gross Amounts Offset on the Balance Sheet 0 0
Net Amount of Assets (Liabilities) Presented on the Balance Sheet (12,021,177) (12,250,450)
Gross Amounts of Financial Instruments Not Offset on the Balance Sheet 12,021,177 12,250,450
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
Federal Home Loan Bank Advances [Member]
    
Offsetting Assets and Liabilities [Line Items]    
Gross Amount of Recognized Assets (Liabilities) (464,476)  
Gross Amounts Offset on the Balance Sheet 0  
Net Amount of Assets (Liabilities) Presented on the Balance Sheet (464,476)  
Gross Amounts of Financial Instruments Not Offset on the Balance Sheet 464,476  
Gross Amounts of Cash Collateral Not Offset on the Balance Sheet 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  
Derivative Financial Instruments, Liabilities [Member]
    
Offsetting Assets and Liabilities [Line Items]    
Gross Amount of Recognized Assets (Liabilities) (9,989) (44,272)
Gross Amounts Offset on the Balance Sheet 1,594 22,191
Net Amount of Assets (Liabilities) Presented on the Balance Sheet (8,395) (22,081)
Gross Amounts of Financial Instruments Not Offset on the Balance Sheet 8,395 22,081
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) (12,495,642) (12,294,722)
Gross Amounts Offset on the Balance Sheet 1,594 22,191
Net Amount of Assets (Liabilities) Presented on the Balance Sheet (12,494,048) (12,272,531)
Gross Amounts of Financial Instruments Not Offset on the Balance Sheet 12,494,048 12,272,531
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