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, 2018
Dec. 31, 2017
Schedule of Maturities of Federal Home Loan Bank Advances [Line Items]    
Federal Home Loan Bank advances $ 865,024 $ 1,215,024
Maturity Within One Year [Member]    
Schedule of Maturities of Federal Home Loan Bank Advances [Line Items]    
Federal Home Loan Bank advances 815,024 0
Maturity One to Three Years [Member]    
Schedule of Maturities of Federal Home Loan Bank Advances [Line Items]    
Federal Home Loan Bank advances 0 815,024
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 Five to Ten Years [Member]    
Schedule of Maturities of Federal Home Loan Bank Advances [Line Items]    
Federal Home Loan Bank advances 0 0
Maturity Over Ten Years [Member]    
Schedule of Maturities of Federal Home Loan Bank Advances [Line Items]    
Federal Home Loan Bank advances $ 50,000 $ 400,000