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

Commercial Real Estate Assets by Geographic Location (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial real estate assets	$ 2,171,344	$ 1,782,749	$ 1,412,543	$ 1,114,548	$ 926,377	$ 660,953
Percentage of Commercial Portfolio	100.00%		100.00%
United States, Northeastern Region [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial real estate assets	$ 924,383		$ 578,762
Percentage of Commercial Portfolio	42.60%		41.00%
United States, Western Region [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial real estate assets	$ 414,612		$ 250,044
Percentage of Commercial Portfolio	19.10%		17.70%
United States, Southwestern Region [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial real estate assets	$ 363,907		$ 267,944
Percentage of Commercial Portfolio	16.80%		19.00%
United States, Southeastern Region [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial real estate assets	$ 350,407		$ 239,194
Percentage of Commercial Portfolio	16.10%		16.90%
United States, Midwestern Region [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial real estate assets	$ 118,035		$ 76,599
Percentage of Commercial Portfolio	5.40%		5.40%