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Reinsurance (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Reinsurance Retention Policy
Flood premiums ceded (percentage)			100.00%
Insurance commissions and fees under Flood Program	$ 236	$ 380	$ 853	$ 1,270
Document Period End Date			Sep. 30, 2022
Event Retention Level	16,400		$ 16,400
Catastrophe Excess of Loss
Reinsurance Retention Policy
Reinsurance, Excess Retention, Amount Reinsured, Per Policy	2,500,000
All Other Perils Excess of Loss
Reinsurance Retention Policy
Reinsurance, Excess Retention, Amount Reinsured, Per Policy	110,000
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	$ 200,000

X

- 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.

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- Definition

Event Retention Level

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- Definition

Insurance Commissions and Fees, Flood Program

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- Definition

Percentage of Flood Premiums Ceded

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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 20
-Section 50
-Paragraph 3
-URI https://asc.fasb.org/extlink&oid=99397103&loc=d3e6811-158387

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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.

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