Quarterly report pursuant to Section 13 or 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
Mar. 31, 2018
Dec. 31, 2017
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]    
Federal Home Loan Bank advances $ 865,024 $ 1,215,024
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 $ 865,024 $ 1,215,024
Weighted average borrowing rate 2.13% 1.79%
Available uncommitted capacity for borrowings $ 2,706,400 $ 2,186,088