Annual report pursuant to Section 13 and 15(d)

Fair Value of Financial Instruments (Details)

v3.6.0.2
Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Repurchase agreements $ 9,316,351 $ 5,008,274
Long-term Federal Home Loan Bank Advances 3,348,762  
Maturity Over One Year [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Repurchase agreements $ 185,634 $ 0