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SCHEDULE IV MORTGAGE LOANS ON REAL ESTATE - Summary (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($) item property	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Mortgage loans on real estate
Number of properties | property	22
Number of beds/units | item	2,804
Balloon Amount	$ 232,343
Current Monthly Debt Service	2,146
Face amount of originated mortgages	263,848
Carrying Amount of Mortgages	257,251	$ 254,099	$ 242,939	$ 223,907
Principal Amount of Loans Subject to Delinquent Principal or Interest	$ 0
Michigan | Mortgage Loans on Real Estate Maturing in 2043 | Property with 2029 Beds/Units
Mortgage loans on real estate
Number of properties | property	15
Number of beds/units | item	1,941
Interest rate (as a percent)	10.14%
Balloon Amount	$ 163,214
Current Monthly Debt Service	1,569
Face amount of originated mortgages	190,214
Carrying Amount of Mortgages	$ 184,506
Michigan | Mortgage Loans on Real Estate Maturing in 2045 | Property with 501 Beds/Units
Mortgage loans on real estate
Number of properties | property	4
Number of beds/units | item	501
Interest rate (as a percent)	9.33%
Balloon Amount	$ 35,180
Current Monthly Debt Service	303
Face amount of originated mortgages	39,010
Carrying Amount of Mortgages	$ 38,541
Michigan | Mortgage Loans on Real Estate Maturing in 2045 | Property with 157 Beds/Units
Mortgage loans on real estate
Number of properties | property	1
Number of beds/units | item	157
Interest rate (as a percent)	9.62%
Balloon Amount	$ 14,325
Current Monthly Debt Service	120
Face amount of originated mortgages	15,000
Carrying Amount of Mortgages	$ 14,776
Michigan | Mortgage Loans on Real Estate Maturing in 2045 | Property with 205 Beds/Units
Mortgage loans on real estate
Number of properties | property	2
Number of beds/units | item	205
Interest rate (as a percent)	9.41%
Balloon Amount	$ 19,624
Current Monthly Debt Service	154
Face amount of originated mortgages	19,624
Carrying Amount of Mortgages	19,428
Principal Amount of Loans Subject to Delinquent Principal or Interest	$ 0
Minimum
Mortgage loans on real estate
Interest rate (as a percent)	5.00%
Maximum
Mortgage loans on real estate
Interest rate (as a percent)	7.50%
Mortgage Loans
Mortgage loans on real estate
Loan Term	30 years
Mortgage Loans | Minimum
Mortgage loans on real estate
Interest rate (as a percent)	9.30%
Mortgage Loans | Maximum
Mortgage loans on real estate
Interest rate (as a percent)	10.10%

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- Definition

Represents the amortization period of mortgage loan on real estate properties.

+ References

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- Definition

Represents the amount of current monthly debt service on mortgage loans on real estate.

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- Definition

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Represents the number of units or beds of owned properties.

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- 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.

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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))
-URI http://asc.fasb.org/extlink&oid=120402547&loc=d3e617274-123014

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Amount of payment to be received at final maturity date for 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
-Footnote 5
-Subsection 29

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 310
-Section S99
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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 12
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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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.

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 310
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-29(Column G))
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