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Reserve for Losses and Loss Adjustment Expenses - Average Annual Percentage Payout of Incurred Claims by Age (Details)	Dec. 31, 2022
Homeowners' Insurance
Short-duration Insurance Contracts, Historical Claims Duration
Year 1	85.32%
Year 2	16.39%
Year 3	0.81%
Year 4	0.88%
Year 5, net	(9.53%)
Year 6	0.35%
Year 7	0.17%
Year 8, net	(1.92%)
Special Property
Short-duration Insurance Contracts, Historical Claims Duration
Year 1	38.78%
Year 2	35.64%
Year 3	10.79%
Year 4	7.40%
Year 5	6.66%
Year 6	0.42%
Year 7	2.24%
Year 8	2.70%

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Short-duration Insurance Contracts, Historical Claims Duration, Year Eight, Net

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Short-duration Insurance Contracts, Historical Claims Duration, Year Five, Net

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Percentage of average annual payout, after reinsurance, in the eighth year after a claim is incurred, beginning with the earliest accident year disclosed for short-duration insurance contracts.

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Percentage of average annual payout, after reinsurance, in the fifth year after a claim is incurred, beginning with the earliest accident year disclosed for short-duration insurance contracts.

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Percentage of average annual payout, after reinsurance, in the fourth year after a claim is incurred, beginning with the earliest accident year disclosed for short-duration insurance contracts.

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Percentage of average annual payout, after reinsurance, in the first year after a claim is incurred, beginning with the earliest accident year disclosed for short-duration insurance contracts.

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Percentage of average annual payout, after reinsurance, in the seventh year after a claim is incurred, beginning with the earliest accident year disclosed for short-duration insurance contracts.

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Percentage of average annual payout, after reinsurance, in the sixth year after a claim is incurred, beginning with the earliest accident year disclosed for short-duration insurance contracts.

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Percentage of average annual payout, after reinsurance, in the third year after a claim is incurred, beginning with the earliest accident year disclosed for short-duration insurance contracts.

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Percentage of average annual payout, after reinsurance, in the second year after a claim is incurred, beginning with the earliest accident year disclosed for short-duration insurance contracts.

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