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Loans, Held for Investment - Schedule of Mortgage Loans by Property Type and Geographic Distribution (Detail) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2017 | Dec. 31, 2016
Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | $ 3,278,334 | $ 2,693,092
Percent of Portfolio | 100.00% | 100.00%
Hotel |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | $ 702,447 | $ 408,428
Percent of Portfolio | 21.40% | 15.20%
Residential - for sale |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | $ 547,113 | $ 469,997
Percent of Portfolio | 16.70% | 17.50%
Urban Retail Predevelopment |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | $ 583,241 | $ 491,187
Percent of Portfolio | 17.80% | 18.20%
Office |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | $ 257,291 | $ 255,031
Percent of Portfolio | 7.80% | 9.50%
Residential Rental |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | $ 290,152 | $ 309,243
Percent of Portfolio | 8.90% | 11.50%
Mixed Use |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | $ 253,649 | $ 134,797
Percent of Portfolio | 7.70% | 4.90%
Retail Center |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | $ 240,902 | $ 209,401
Percent of Portfolio | 7.30% | 7.80%
Healthcare |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | $ 172,872 | $ 170,549
Percent of Portfolio | 5.30% | 6.30%
Industrial |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | $ 157,040 | $ 156,809
Percent of Portfolio | 4.80% | 5.80%
Other |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | $ 73,627 | $ 87,650
Percent of Portfolio | 2.30% | 3.30%
New York City |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | $ 1,255,668 | $ 1,034,303
Percent of Portfolio | 38.30% | 38.40%
Midwest |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | $ 498,767 | $ 405,992
Percent of Portfolio | 15.20% | 15.10%
Southeast |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | $ 596,664 | $ 332,276
Percent of Portfolio | 18.20% | 12.30%
United Kingdom |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | $ 252,881 | $ 244,756
Percent of Portfolio | 7.70% | 9.10%
West |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | $ 226,977 | $ 219,664
Percent of Portfolio | 6.90% | 8.20%
Mid Atlantic |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | $ 198,501 | $ 263,717
Percent of Portfolio | 6.10% | 9.80%
Southwest |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | $ 25,000 | $ 54,614
Percent of Portfolio | 0.80% | 2.00%
Northeast |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | $ 181,987 | $ 137,770
Percent of Portfolio | 5.50% | 5.10%
Other International |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | $ 41,889 | $ 0
Percent of Portfolio | 1.30% | 0.00%

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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 + Details
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