Reinsurance - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Ceded Losses and LAE Incurred	$ 911,441	$ 645,204	$ 549,188
Commission and Fees on Flood Revenue	$ 1,501	$ 1,467	$ 1,506

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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