Annual report pursuant to Section 13 and 15(d)

Accrued Interest Receivable (Details)

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Accrued Interest Receivable (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accrued interest receivable $ 68,309 $ 59,006
Loans Held-for-Investment, Residential Mortgages [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accrued interest receivable 0 18,928
Loans Held-for-Sale, Residential Mortgages [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accrued interest receivable 162 164
Federal National Mortgage Association Certificates and Obligations (FNMA) [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accrued interest receivable 46,517 25,273
Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC) [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accrued interest receivable 12,255 8,914
Government National Mortgage Association Certificates and Obligations (GNMA) [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accrued interest receivable 4,635 3,068
Mortgage-backed Securities, Issued by Private Enterprises [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accrued interest receivable 4,740 2,659
Available-for-sale Securities [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accrued interest receivable $ 68,147 $ 39,914