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

Accrued Interest Receivable Schedule of Accounts, Notes, Loans and Financing Receivable (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest Receivable	$ 54,080	$ 42,613
Loans Held-for-sale, Mortgages [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest Receivable	5,353	247
Loans Held-for-investment, Mortgages [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest Receivable	1,428	0
US Treasury Securities [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest Receivable	1,101	1,119
Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC) [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest Receivable	13,660	11,888
Federal National Mortgage Association Certificates and Obligations (FNMA) [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest Receivable	19,732	17,101
Government National Mortgage Association Certificates and Obligations (GNMA) [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest Receivable	8,880	8,962
Mortgage-backed Securities, Issued by Private Enterprises [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest Receivable	3,926	3,296
Available-for-sale Securities [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest Receivable	$ 46,198	$ 41,247