Annual report pursuant to Section 13 and 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
Dec. 31, 2017
Dec. 31, 2016
Schedule of Assets Underlying Federal Home Loan Bank Advances [Line Items]    
Assets pledged as collateral for Federal Home Loan Bank advances $ 1,273,674 $ 4,287,485
Federal Home Loan Bank stock 53,826 167,856
Federal Home Loan Bank of Des Moines [Member]    
Schedule of Assets Underlying Federal Home Loan Bank Advances [Line Items]    
Federal Home Loan Bank stock 53,826 167,856
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 1,210,715 3,576,481
Discontinued Operations [Member]    
Schedule of Assets Underlying Federal Home Loan Bank Advances [Line Items]    
Assets pledged as collateral for Federal Home Loan Bank advances 0 708,989
Retained Interest [Member]    
Schedule of Assets Underlying Federal Home Loan Bank Advances [Line Items]    
Assets pledged as collateral for Federal Home Loan Bank advances 0 2,015
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 $ 62,959 $ 0