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Reinsurance (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Reinsurance Retention Policy
Amount of risk reinsured in excess of stated retention	$ 2,900,000
Flood premiums ceded (percentage)			100.00%
Insurance commissions and fees under Flood Program	$ 380	$ 431	$ 1,270	$ 1,195
Document Period End Date			Sep. 30, 2021
Ceded losses - All Other Perils Contract			$ 91,127
Reinstatement Premium - All Other Perils			$ 14,732

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Ceded losses - All Other Perils Contract

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Insurance Commissions and Fees, Flood Program

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Percentage of Flood Premiums Ceded

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Reinstatement Premium - All Other Perils

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Amount of risk reinsured in excess of stated retention per company policy.

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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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