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Summary of Significant Accounting Policies - Loans receivable, net (Details) $ in Millions	Sep. 30, 2025 USD ($)
Loan receivable, net
Financing Receivable, Practical Expedient, Accrued Interest Exclusion	true
Deferred expenses and other assets, net
Loan receivable, net
Accrued interest on loans receivable	$ 0.2

X

- Definition

Amount, before allowance for credit loss, of accrued interest on financing receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 3B
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-3B

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Indicates (true false) whether practical expedient was elected to exclude accrued interest from financing receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 3B
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-3B

+ Details

Name:	us-gaap_FinancingReceivablePracticalExpedientAccruedInterestExclusion
Namespace Prefix:	us-gaap_
Data Type:	xbrli:booleanItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_BalanceSheetLocationAxis=safe_DeferredCostsAndOtherAssetsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: