Quarterly report pursuant to Section 13 or 15(d)

Federal Home Loan Bank Advances (Details)

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Federal Home Loan Bank Advances (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]    
Federal Home Loan Bank advances $ 4,000,000 $ 3,785,000
Federal Home Loan Bank, Advances, General Debt Obligations, Amount of Available, Unused Funds 0 215,000
Federal Home Loan Bank stock 167,856 156,650
Federal Home Loan Bank of Des Moines [Member]    
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]    
Federal Home Loan Bank advances $ 4,000,000 $ 3,785,000
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Interest Rate at Period End 0.67% 0.58%
Federal Home Loan Bank stock $ 167,856 $ 156,650