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Reinsurance (Details) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2023 USD ($)	Sep. 30, 2023 USD ($)
Reinsurance Retention Policy
Document Period End Date		Sep. 30, 2023
Event Retention Level	$ 10,000	$ 10,000
Catastrophe Excess of Loss
Reinsurance Retention Policy
Reinsurance, Excess Retention, Amount Reinsured, Per Policy	1,300,000
All Other Perils Excess of Loss
Reinsurance Retention Policy
Reinsurance, Excess Retention, Amount Reinsured, Per Policy	101,000
Interboro Insurance
Reinsurance Retention Policy
Event Retention Level	3,000	$ 3,000
Interboro Insurance | Catastrophe Excess of Loss
Reinsurance Retention Policy
Reinsurance, Excess Retention, Amount Reinsured, Per Policy	$ 82,000

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- Definition

Event Retention Level

+ References

No definition available.

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- Definition

For the EDGAR submission types of Form 8-K: the date of the report, the date of the earliest event reported; for the EDGAR submission types of Form N-1A: the filing date; for all other submission types: the end of the reporting or transition period. The format of the date is YYYY-MM-DD.

+ References

No definition available.

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- Definition

Amount per policy of risk ceded to reinsurer in excess of risk undertaken originally by insurer that is not ceded to reinsurer.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 944
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479838/944-20-50-3

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 944
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479838/944-20-50-3

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