Quarterly report pursuant to Section 13 or 15(d)

Fair Value of Financial Instruments (Details)

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Fair Value of Financial Instruments (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Securities Sold under Agreements to Repuchase, Long-term $ 200,000 $ 200,000
Assets Sold under Agreements to Repurchase, Repurchase Liability 12,021,177 12,250,450
Long-term Federal Home Loan Bank Advances 428,238  
Maturity Over One Year [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Assets Sold under Agreements to Repurchase, Repurchase Liability $ 200,000 $ 200,000