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
Jun. 30, 2015
Dec. 31, 2014
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]    
Federal Home Loan Bank advances $ 3,000,000 $ 2,500,000
Federal Home Loan Bank, Advances, General Debt Obligations, Amount of Available, Unused Funds 1,000,000  
Federal Home Loan Bank stock 125,250 100,010
Federal Home Loan Bank of Des Moines [Member]    
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]    
Federal Home Loan Bank advances $ 3,000,000 $ 2,500,000
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Weighted Average Interest Rate 0.35% 0.34%
Federal Home Loan Bank stock $ 125,250 $ 103,010