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

Derivative Instruments and Hedging Activities Commitments to Purchase Residential Mortgage Loans Held-for-Sale (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014
Derivative [Line Items]
Derivative, Notional Amount	$ 26,141,370	$ 26,390,596	$ 21,998,381	$ 27,401,335	$ 33,709,043	$ 48,115,523
Loan Purchase Commitments [Member]
Derivative [Line Items]
Derivative, Notional Amount	636,467	$ 252,212	286,120	$ 626,660	$ 707,304	$ 554,838
Derivative Financial Instruments, Assets [Member]
Derivative [Line Items]
Derivative, Notional Amount	16,940,106		21,735,997
Derivative, Fair Value, Net	223,985		271,509
Derivative Financial Instruments, Assets [Member] \| Loan Purchase Commitments [Member]
Derivative [Line Items]
Derivative, Notional Amount	521,240		98,736
Derivative, Fair Value, Net	810		77
Derivative Financial Instruments, Liabilities [Member]
Derivative [Line Items]
Derivative, Notional Amount	15,145,264		1,362,384
Derivative, Fair Value, Net	(160,724)		(7,285)
Derivative Financial Instruments, Liabilities [Member] \| Loan Purchase Commitments [Member]
Derivative [Line Items]
Derivative, Notional Amount	115,227		187,384
Derivative, Fair Value, Net	$ (70)		$ (427)