Quarterly report pursuant to Section 13 or 15(d)

Underlying Assets of Federal Home Loan Bank Advances (Details)

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Underlying Assets of Federal Home Loan Bank Advances (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Federal Home Loan Bank of Des Moines [Member]    
Schedule of Assets Underlying Federal Home Loan Bank Advances [Line Items]    
Federal Home Loan Bank stock $ 38,700 $ 40,800
Available-for-sale Securities [Member]    
Schedule of Assets Underlying Federal Home Loan Bank Advances [Line Items]    
Assets pledged as collateral for Federal Home Loan Bank advances $ 918,300 $ 917,500