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	Sep. 30, 2016	Jun. 30, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Dec. 31, 2014
Derivative [Line Items]
Derivative, Notional Amount	$ 22,062,904	$ 26,141,370	$ 21,998,381	$ 28,317,580	$ 27,401,335	$ 48,115,523
Loan Purchase Commitments [Member]
Derivative [Line Items]
Derivative, Notional Amount	61,403	$ 636,467	286,120	$ 501,192	$ 626,660	$ 554,838
Derivative Financial Instruments, Assets [Member]
Derivative [Line Items]
Derivative, Notional Amount	16,759,324		21,735,997
Derivative, Fair Value, Net	199,013		271,509
Derivative Financial Instruments, Assets [Member] \| Loan Purchase Commitments [Member]
Derivative [Line Items]
Derivative, Notional Amount	46,134		98,736
Derivative, Fair Value, Net	310		77
Derivative Financial Instruments, Liabilities [Member]
Derivative [Line Items]
Derivative, Notional Amount	9,221,580		1,362,384
Derivative, Fair Value, Net	(39,918)		(7,285)
Derivative Financial Instruments, Liabilities [Member] \| Loan Purchase Commitments [Member]
Derivative [Line Items]
Derivative, Notional Amount	15,269		187,384
Derivative, Fair Value, Net	$ (40)		$ (427)