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Reserve for Losses and Loss Adjustment Expenses - Summary of Average Annual Payout of Losses (Details) - Property Insurance Product Line
Dec. 31, 2020
Average Annual Percentage Payout of Incurred Losses and Allocated LAE by Year  
Year 1 6.00%
Year 2 40.00%
Year 3 28.00%
Year 4 9.00%
Year 5 4.00%
Year 6 7.00%
Year 7 0.00%
Year 8 0.00%
Year 9 0.00%