Annual report pursuant to Section 13 and 15(d)

Federal Home Loan Bank Advances Outstanding Balances and Key Metrics (Details)

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Federal Home Loan Bank Advances Outstanding Balances and Key Metrics (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]    
Federal Home Loan Bank advances $ 3,785,000 $ 2,500,000
Federal Home Loan Bank, Advances, General Debt Obligations, Amount of Available, Unused Funds 215,000  
Federal Home Loan Bank of Des Moines [Member]    
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]    
Federal Home Loan Bank advances $ 3,785,000 $ 2,500,000
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Weighted Average Interest Rate 0.58% 0.34%