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
Sep. 30, 2014
Dec. 31, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Securities Sold under Agreements to Repuchase, Long-term $ 93,220 $ 200,000
Assets Sold under Agreements to Repurchase, Repurchase Liability 12,274,878 12,250,450
Long-term Federal Home Loan Bank Advances 1,466,262  
Maturity Over One Year [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Assets Sold under Agreements to Repurchase, Repurchase Liability $ 93,220 $ 200,000