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
Mar. 31, 2016
Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Assets Sold under Agreements to Repurchase, Repurchase Liability $ 6,189,852 $ 5,008,274
Long-term Federal Home Loan Bank Advances 3,571,762  
Maturity Over One Year [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Assets Sold under Agreements to Repurchase, Repurchase Liability $ 102,435 $ 0