Quarterly report pursuant to Section 13 or 15(d)

Schedule of Underlying Assets of Federal Home Loan Bank Advances (Details)

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Schedule of Underlying Assets of Federal Home Loan Bank Advances (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Schedule of Assets Underlying Federal Home Loan Bank Advances [Line Items]    
Assets pledged as collateral for Federal Home Loan Bank advances $ 903,047 $ 1,273,674
Federal Home Loan Bank stock 40,845 53,826
Federal Home Loan Bank of Des Moines [Member]    
Schedule of Assets Underlying Federal Home Loan Bank Advances [Line Items]    
Federal Home Loan Bank stock 40,845 53,826
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 903,047 1,210,715
Due From Correspondent Brokers [Member]    
Schedule of Assets Underlying Federal Home Loan Bank Advances [Line Items]    
Assets pledged as collateral for Federal Home Loan Bank advances $ 0 $ 62,959