Quarterly report pursuant to Section 13 or 15(d)

Accrued Interest Receivable (Details)

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Accrued Interest Receivable (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accrued interest receivable $ 85,257 $ 68,309
Loans Held-for-Sale, Residential Mortgages [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accrued interest receivable 155 162
Reverse Repurchase Agreements [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accrued interest receivable 881 0
Federal National Mortgage Association Certificates and Obligations (FNMA) [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accrued interest receivable 56,484 46,517
Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC) [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accrued interest receivable 16,258 12,255
Government National Mortgage Association Certificates and Obligations (GNMA) [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accrued interest receivable 5,987 4,635
Mortgage-backed Securities, Issued by Private Enterprises [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accrued interest receivable 5,492 4,740
Available-for-sale Securities [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accrued interest receivable $ 84,221 $ 68,147