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Changes in Mortgage Loans (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Mortgage Loans On Real Estate [Abstract]
Balance at beginning of period	$ 120,130	$ 209,566
Additions during period:
Interest	12,150	18,285
Deductions during period:
Provision for loan loss reserve	(19,393)	(15,544)
Collections of principal and interest	(112,887)	(92,177)
Balance at close of period	$ 0	$ 120,130

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- Definition

Additions during period.

+ References

No definition available.

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- Definition

Deductions during period.

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- Definition

The amount of principal and interest collected on mortgage loans on real estate during the reporting period.

+ References

No definition available.

+ Details

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Namespace Prefix:	sitc_
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Balance Type:	credit
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- Definition

Mortgage loans on real estate loan loss reserves.

+ References

No definition available.

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Namespace Prefix:	sitc_
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- References

No definition available.

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- Definition

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
-Subparagraph (SX 210.12-29(Column G))
-URI http://asc.fasb.org/extlink&oid=120402547&loc=d3e617274-123014

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- Definition

Amount of addition to 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, classified as other.

+ 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 6))
-URI http://asc.fasb.org/extlink&oid=120402547&loc=d3e617274-123014

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