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Reinsurance - Ceded Written Premiums (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Reinsurance Retention [Line Items]
Ceded written premiums	$ 524,575	$ 223,443	$ 155,102
Ceded Written Premiums [Member]
Reinsurance Retention [Line Items]
Ceded written premiums	365,193	96,001	59,276
Fronting premium | Ceded Written Premiums [Member]
Reinsurance Retention [Line Items]
Ceded written premiums	237,285	11,001
Inland Marine | Ceded Written Premiums [Member]
Reinsurance Retention [Line Items]
Ceded written premiums	63,627	28,389	5,339
Specialty Homeowners | Ceded Written Premiums [Member]
Reinsurance Retention [Line Items]
Ceded written premiums	4,946	27,394	22,295
Commercial Earthquake | Ceded Written Premiums [Member]
Reinsurance Retention [Line Items]
Ceded written premiums	20,467	14,447	6,929
Commercial All Risk | Ceded Written Premiums [Member]
Reinsurance Retention [Line Items]
Ceded written premiums	6,260	3,948	19,218
Others | Ceded Written Premiums [Member]
Reinsurance Retention [Line Items]
Ceded written premiums	$ 32,609	$ 10,822	$ 5,495

X

- Definition

Amount of written premiums ceded to other entities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 605
-Section 50
-Paragraph 1
-Subparagraph (b)(3)
-URI https://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 605
-Section 50
-Paragraph 1
-Subparagraph (c)(2)
-URI https://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547

+ Details

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X

- 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

No definition available.

+ Details

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