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

Serviced Mortgage Assets (Details) $ in Thousands	Dec. 31, 2017 USD ($) loan	Dec. 31, 2016 USD ($) loan
Assets that Continue to be Recognized, Securitized or Asset-backed Financing Arrangement Assets and any Other Financial Assets Managed Together [Line Items]
Number of Loans \| loan	458,109	285,122
Unpaid Principal Balance \| $	$ 103,999,702	$ 66,112,005
Servicing Contracts [Member]
Assets that Continue to be Recognized, Securitized or Asset-backed Financing Arrangement Assets and any Other Financial Assets Managed Together [Line Items]
Number of Loans \| loan	454,028	280,185
Unpaid Principal Balance \| $	$ 101,344,054	$ 62,827,975
Loans in Securitization Trusts, Residential Mortgages [Member]
Assets that Continue to be Recognized, Securitized or Asset-backed Financing Arrangement Assets and any Other Financial Assets Managed Together [Line Items]
Number of Loans \| loan	3,845	0
Unpaid Principal Balance \| $	$ 2,618,016	$ 0
Loans Held-for-Investment, Residential Mortgages [Member]
Assets that Continue to be Recognized, Securitized or Asset-backed Financing Arrangement Assets and any Other Financial Assets Managed Together [Line Items]
Number of Loans \| loan	0	4,604
Unpaid Principal Balance \| $	$ 0	$ 3,234,044
Loans Held-for-Sale, Residential Mortgages [Member]
Assets that Continue to be Recognized, Securitized or Asset-backed Financing Arrangement Assets and any Other Financial Assets Managed Together [Line Items]
Number of Loans \| loan	236	333
Unpaid Principal Balance \| $	$ 37,632	$ 49,986