Annual report pursuant to Section 13 and 15(d)

Federal Home Loan Bank of Des Moines Advances (Details)

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Federal Home Loan Bank of Des Moines Advances (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]    
Federal Home Loan Bank advances $ 1,215,024 $ 4,000,000
Available uncommitted capacity for borrowings $ 2,186,088 0
Maximum percent of FHLB advances to total assets 40.00%  
Federal Home Loan Bank of Des Moines [Member]    
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]    
Federal Home Loan Bank advances $ 1,215,024 $ 4,000,000
Weighted average borrowing rate 1.79% 0.85%