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Commercial Mortgage, Subordinate Loans and Other Lending Assets, Net - Schedule of Mortgage Loans by Property Type and Geographic Distribution (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Loans and Leases Receivable Disclosure [Line Items]
Carrying value	$ 6,375,093	$ 4,927,593
% of Portfolio	100.00%	100.00%
Manhattan, NY
Loans and Leases Receivable Disclosure [Line Items]
Carrying value	$ 1,793,570	$ 1,669,145
% of Portfolio	28.10%	33.90%
Brooklyn, NY
Loans and Leases Receivable Disclosure [Line Items]
Carrying value	$ 373,917	$ 346,056
% of Portfolio	5.90%	7.00%
Northeast
Loans and Leases Receivable Disclosure [Line Items]
Carrying value	$ 110,771	$ 23,479
% of Portfolio	1.70%	0.50%
West
Loans and Leases Receivable Disclosure [Line Items]
Carrying value	$ 728,182	$ 614,160
% of Portfolio	11.40%	12.50%
Midwest
Loans and Leases Receivable Disclosure [Line Items]
Carrying value	$ 614,337	$ 631,710
% of Portfolio	9.60%	12.80%
Southeast
Loans and Leases Receivable Disclosure [Line Items]
Carrying value	$ 564,166	$ 559,043
% of Portfolio	8.90%	11.30%
United Kingdom
Loans and Leases Receivable Disclosure [Line Items]
Carrying value	$ 1,274,390	$ 700,460
% of Portfolio	20.00%	14.20%
Other
Loans and Leases Receivable Disclosure [Line Items]
Carrying value	$ 915,760	$ 383,540
% of Portfolio	14.40%	7.80%
Hotel
Loans and Leases Receivable Disclosure [Line Items]
Carrying value	$ 1,660,162	$ 1,286,590
% of Portfolio	26.00%	26.10%
Office
Loans and Leases Receivable Disclosure [Line Items]
Carrying value	$ 1,401,400	$ 832,620
% of Portfolio	22.00%	16.90%
Residential-for-sale: construction
Loans and Leases Receivable Disclosure [Line Items]
Carrying value	$ 692,816	$ 528,510
% of Portfolio	10.90%	10.70%
Residential-for-sale: inventory
Loans and Leases Receivable Disclosure [Line Items]
Carrying value	$ 321,673	$ 577,053
% of Portfolio	5.10%	11.70%
Urban Retail
Loans and Leases Receivable Disclosure [Line Items]
Carrying value	$ 643,706	$ 0
% of Portfolio	10.10%	0.00%
Urban Predevelopment
Loans and Leases Receivable Disclosure [Line Items]
Carrying value	$ 409,864	$ 683,886
% of Portfolio	6.40%	13.90%
Healthcare
Loans and Leases Receivable Disclosure [Line Items]
Carrying value	$ 371,423	$ 156,814
% of Portfolio	5.80%	3.20%
Other
Loans and Leases Receivable Disclosure [Line Items]
Carrying value	$ 874,049	$ 862,120
% of Portfolio	13.70%	17.50%

X

- Definition

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

+ References

No definition available.

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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.

+ 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://fasb.org/us-gaap/role/ref/legacyRef
-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=119400593&loc=d3e572229-122910

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