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Schedule IV - Mortgage Loans on Real Estate - Schedule of Mortgage Loans on Real Estate (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Face Amount of Mortgages	$ 498,729
Carrying amount of mortgages	496,553	$ 561,761	$ 730,515	$ 752,129
Reserves on impaired loans	700
Borrower A
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Prior Liens	0
Face Amount of Mortgages	83,579
Carrying amount of mortgages	$ 83,846
Borrower A | LIBOR | Contractual Interest Accrual Rates
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Basis spread on variable rate (as a percent)	4.50%
Borrower A | LIBOR | Contractual Interest Payment Rates
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Basis spread on variable rate (as a percent)	4.50%
Borrower B
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Prior Liens	$ 0
Face Amount of Mortgages	58,161
Carrying amount of mortgages	$ 58,070
Borrower B | LIBOR | Contractual Interest Accrual Rates
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Basis spread on variable rate (as a percent)	6.00%
Borrower B | LIBOR | Contractual Interest Payment Rates
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Basis spread on variable rate (as a percent)	6.00%
Borrower C
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Prior Liens	$ 0
Face Amount of Mortgages	61,805
Carrying amount of mortgages	$ 61,740
Borrower C | LIBOR | Contractual Interest Accrual Rates
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Basis spread on variable rate (as a percent)	6.00%
Borrower C | LIBOR | Contractual Interest Payment Rates
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Basis spread on variable rate (as a percent)	6.00%
Borrower D
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Prior Liens	$ 0
Face Amount of Mortgages	53,055
Carrying amount of mortgages	$ 53,033
Borrower D | LIBOR | Contractual Interest Accrual Rates
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Basis spread on variable rate (as a percent)	5.25%
Borrower D | LIBOR | Contractual Interest Payment Rates
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Basis spread on variable rate (as a percent)	5.25%
Borrower E
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Prior Liens	$ 0
Face Amount of Mortgages	52,552
Carrying amount of mortgages	$ 52,563
Borrower E | LIBOR | Contractual Interest Accrual Rates
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Basis spread on variable rate (as a percent)	6.75%
Borrower E | LIBOR | Contractual Interest Payment Rates
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Basis spread on variable rate (as a percent)	6.75%
Borrower F
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Prior Liens	$ 0
Face Amount of Mortgages	51,705
Carrying amount of mortgages	$ 51,629
Borrower F | LIBOR | Contractual Interest Accrual Rates
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Basis spread on variable rate (as a percent)	4.75%
Borrower F | LIBOR | Contractual Interest Payment Rates
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Basis spread on variable rate (as a percent)	4.75%
Borrower G
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Prior Liens	$ 0
Face Amount of Mortgages	42,501
Carrying amount of mortgages	$ 42,501
Borrower G | LIBOR | Contractual Interest Accrual Rates
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Basis spread on variable rate (as a percent)	4.50%
Borrower G | LIBOR | Contractual Interest Payment Rates
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Basis spread on variable rate (as a percent)	4.50%
Borrower H
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Prior Liens	$ 0
Face Amount of Mortgages	24,585
Carrying amount of mortgages	$ 24,610
Borrower H | LIBOR | Contractual Interest Accrual Rates
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Basis spread on variable rate (as a percent)	5.25%
Borrower H | LIBOR | Contractual Interest Payment Rates
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Basis spread on variable rate (as a percent)	5.25%
Borrower I
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Prior Liens	$ 0
Face Amount of Mortgages	22,500
Carrying amount of mortgages	$ 20,115
Borrower I | LIBOR | Contractual Interest Accrual Rates
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Basis spread on variable rate (as a percent)	2.65%
Borrower I | LIBOR | Contractual Interest Payment Rates
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Basis spread on variable rate (as a percent)	2.65%
Borrower J
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Prior Liens	$ 0
Face Amount of Mortgages	20,955
Carrying amount of mortgages	$ 20,999
Borrower J | LIBOR | Contractual Interest Accrual Rates
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Basis spread on variable rate (as a percent)	5.25%
Borrower J | LIBOR | Contractual Interest Payment Rates
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Basis spread on variable rate (as a percent)	5.25%
Senior mortgages individually less than 3 percent
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Face Amount of Mortgages	$ 15,694
Carrying amount of mortgages	$ 15,807
Senior mortgages individually less than 3 percent | Contractual Interest Accrual Rates
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Fixed interest rate (as a percent)	9.68%
Senior mortgages individually less than 3 percent | Contractual Interest Payment Rates
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Fixed interest rate (as a percent)	9.68%
Senior mortgages individually less than 3 percent | LIBOR | Contractual Interest Accrual Rates
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Basis spread on variable rate (as a percent)	5.00%
Senior mortgages individually less than 3 percent | LIBOR | Contractual Interest Payment Rates
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Basis spread on variable rate (as a percent)	5.00%
Senior mortgages
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Face Amount of Mortgages	$ 487,092
Carrying amount of mortgages	484,913
Subordinate mortgages individually less than 3 percent
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Face Amount of Mortgages	11,637
Carrying amount of mortgages	$ 11,640
Subordinate mortgages individually less than 3 percent | Contractual Interest Accrual Rates
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Fixed interest rate (as a percent)	6.80%
Subordinate mortgages individually less than 3 percent | Contractual Interest Payment Rates
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Fixed interest rate (as a percent)	6.80%
Subordinate mortgages
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Face Amount of Mortgages	$ 11,637
Carrying amount of mortgages	$ 11,640

X

- Definition

Amount of contractual principal due at origination of mortgage loan within investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 12
-Paragraph Column F
-Subsection 29

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 310
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-29(Column F))
-URI http://asc.fasb.org/extlink&oid=120402547&loc=d3e617274-123014

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- Definition

Interest rate of mortgage loan within investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 12
-Paragraph Column B
-Subsection 29

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 310
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-29(Column B))
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Amount of prior lien on real estate securing mortgage loan within investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 12
-Paragraph Column E
-Subsection 29

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 310
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-29(Column E))
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- Definition

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+ References

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Amount of investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 310
-Section S99
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=120402547&loc=d3e617274-123014

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Amount of mortgage loan within investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate, written down.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 310
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-29(Footnote 7))
-URI http://asc.fasb.org/extlink&oid=120402547&loc=d3e617274-123014

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