TWO Quarterly report pursuant to Section 13 or 15(d)

Accrued Interest Receivable (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accrued interest receivable	$ 67,370	$ 68,309
Loans Held-for-Sale, Residential Mortgages [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accrued interest receivable	151	162
Federal National Mortgage Association Certificates and Obligations (FNMA) [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accrued interest receivable	46,490	46,517
Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC) [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accrued interest receivable	11,401	12,255
Government National Mortgage Association Certificates and Obligations (GNMA) [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accrued interest receivable	4,687	4,635
Mortgage-backed Securities, Issued by Private Enterprises [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accrued interest receivable	4,641	4,740
Available-for-sale Securities [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accrued interest receivable	$ 67,219	$ 68,147