TWO Annual report pursuant to Section 13 and 15(d)

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