Quarterly report pursuant to Section 13 or 15(d)

Schedule of Maturities of Federal Home Loan Bank Advances (Details)

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Schedule of Maturities of Federal Home Loan Bank Advances (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Schedule of Maturities of Federal Home Loan Bank Advances [Line Items]    
Federal Home Loan Bank advances $ 3,710,000 $ 2,500,000
Maturity Within One Year [Member]    
Schedule of Maturities of Federal Home Loan Bank Advances [Line Items]    
Federal Home Loan Bank advances 0 33,738
Maturity One to Three Years [Member]    
Schedule of Maturities of Federal Home Loan Bank Advances [Line Items]    
Federal Home Loan Bank advances 651,238 651,238
Maturity Three to Five Years [Member]    
Schedule of Maturities of Federal Home Loan Bank Advances [Line Items]    
Federal Home Loan Bank advances 815,024 815,024
Maturity One to Two Years [Member]    
Schedule of Maturities of Federal Home Loan Bank Advances [Line Items]    
Federal Home Loan Bank advances 0 0
Maturity Over Two Years [Member]    
Schedule of Maturities of Federal Home Loan Bank Advances [Line Items]    
Federal Home Loan Bank advances $ 2,243,738 $ 1,000,000