Annual report pursuant to Section 13 and 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
Dec. 31, 2017
Dec. 31, 2016
Schedule of Maturities of Federal Home Loan Bank Advances [Line Items]    
Federal Home Loan Bank advances $ 1,215,024 $ 4,000,000
Maturity Within One Year [Member]    
Schedule of Maturities of Federal Home Loan Bank Advances [Line Items]    
Federal Home Loan Bank advances 0 651,238
Maturity One to Three Years [Member]    
Schedule of Maturities of Federal Home Loan Bank Advances [Line Items]    
Federal Home Loan Bank advances 815,024 815,024
Maturity Three to Five Years [Member]    
Schedule of Maturities of Federal Home Loan Bank Advances [Line Items]    
Federal Home Loan Bank advances 0 0
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 $ 400,000 $ 2,533,738