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Commercial Mortgage and Subordinate Loans, Net - Schedule of Mortgage Loans by Property Type and Geographic Distribution (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Mortgage Loans on Real Estate [Line Items]
Carrying value	$ 3,679,758	$ 2,693,092
% of Portfolio	100.00%	100.00%
Urban Retail Predevelopment [Member]
Mortgage Loans on Real Estate [Line Items]
Carrying value	$ 654,736	$ 491,187
% of Portfolio	17.80%	18.20%
Hotel [Member]
Mortgage Loans on Real Estate [Line Items]
Carrying value	$ 645,056	$ 408,428
% of Portfolio	17.50%	15.20%
Office [Member]
Mortgage Loans on Real Estate [Line Items]
Carrying value	$ 513,830	$ 255,031
% of Portfolio	14.00%	9.50%
Residential Rental [Member]
Mortgage Loans on Real Estate [Line Items]
Carrying value	$ 465,057	$ 309,243
% of Portfolio	12.60%	11.50%
Residential-for Sale [Member]
Mortgage Loans on Real Estate [Line Items]
Carrying value	$ 442,179	$ 469,997
% of Portfolio	12.00%	17.50%
Mixed Use [Member]
Mortgage Loans on Real Estate [Line Items]
Carrying value	$ 354,640	$ 134,797
% of Portfolio	9.60%	5.00%
Retail Center [Member]
Mortgage Loans on Real Estate [Line Items]
Carrying value	$ 198,913	$ 209,401
% of Portfolio	5.40%	7.80%
Healthcare [Member]
Mortgage Loans on Real Estate [Line Items]
Carrying value	$ 173,870	$ 170,549
% of Portfolio	4.70%	6.30%
Other Property [Member]
Mortgage Loans on Real Estate [Line Items]
Carrying value	$ 154,141	$ 87,650
% of Portfolio	4.20%	3.30%
Industrial [Member]
Mortgage Loans on Real Estate [Line Items]
Carrying value	$ 77,338	$ 156,809
% of Portfolio	2.10%	5.80%
Manhattan, NY [Member]
Mortgage Loans on Real Estate [Line Items]
Carrying value	$ 1,173,833	$ 870,914
% of Portfolio	31.90%	32.30%
Brooklyn, NY [Member]
Mortgage Loans on Real Estate [Line Items]
Carrying value	$ 357,611	$ 163,389
% of Portfolio	9.70%	6.10%
Northeast [Member]
Mortgage Loans on Real Estate [Line Items]
Carrying value	$ 100,536	$ 137,770
% of Portfolio	2.70%	5.10%
Midwest [Member]
Mortgage Loans on Real Estate [Line Items]
Carrying value	$ 683,380	$ 405,992
% of Portfolio	18.60%	15.10%
Southeast [Member]
Mortgage Loans on Real Estate [Line Items]
Carrying value	$ 531,582	$ 332,276
% of Portfolio	14.40%	12.30%
United Kingdom [Member]
Mortgage Loans on Real Estate [Line Items]
Carrying value	$ 303,488	$ 244,756
% of Portfolio	8.20%	9.10%
West [Member]
Mortgage Loans on Real Estate [Line Items]
Carrying value	$ 227,024	$ 219,664
% of Portfolio	6.20%	8.20%
Mid Atlantic [Member]
Mortgage Loans on Real Estate [Line Items]
Carrying value	$ 191,976	$ 263,717
% of Portfolio	5.20%	9.80%
Other International [Member]
Mortgage Loans on Real Estate [Line Items]
Carrying value	$ 76,713	$ 0
% of Portfolio	2.10%	0.00%
Southwest [Member]
Mortgage Loans on Real Estate [Line Items]
Carrying value	$ 33,615	$ 54,614
% of Portfolio	0.90%	2.00%

X

- Definition

Mortgage Loans on Real Estate, Commercial and Consumer, Percentage of Portfolio

+ References

No definition available.

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- Definition

The balance represents the amount of loans that are secured by real estate mortgages, offset by the reserve to cover probable credit losses on the loan portfolio.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.1(c))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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