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Property and Casualty Insurance Activity - Schedule of Material Terms for Reinsurance Treaties (Details) $ in Thousands | 3 Months Ended | 6 Months Ended | 7 Months Ended | 9 Months Ended | 12 Months Ended | 36 Months Ended
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Sep. 30, 2024 USD ($) | Jun. 30, 2025 USD ($) | Dec. 31, 2024 USD ($) | Jun. 30, 2024 USD ($) | Dec. 31, 2023 USD ($) | Jun. 30, 2023 USD ($) | Dec. 31, 2022 USD ($) | Jun. 30, 2022 USD ($) | Apr. 30, 2025 USD ($) | Sep. 30, 2024 USD ($) h | Dec. 31, 2025 | Jun. 30, 2025 USD ($) | Dec. 31, 2024 | Jun. 30, 2024 USD ($) | Dec. 31, 2023 | Jun. 30, 2023 USD ($) | Dec. 31, 2022 | Dec. 31, 2024 USD ($)
Effects of Reinsurance [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Single risk coverage |  |  |  |  |  |  |  |  |  | $ 9,000 |  |  |  |  |  |  |  |
Catastrophe coverage, multiple of per occurrence limitation |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |
Catastrophe coverage, number of consecutive hours | h |  |  |  |  |  |  |  |  |  | 168 |  |  |  |  |  |  |  |
Reinstatement of premium protection |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 50,000 |  | $ 12,500 |  |
Excess of catastrophe coverage |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 10,000 |  | $ 10,000 |  |
Limited retention |  |  |  |  |  |  |  |  |  | $ 1,000 |  |  |  |  |  |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Direct loss | $ 3,500 |  |  |  |  |  |  |  |  | 3,500 |  |  |  |  |  |  |  |
Reduces retention |  |  |  |  |  |  |  |  |  | 500 |  |  |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Direct loss | $ 9,000 |  |  |  |  |  |  |  |  | 9,000 |  |  |  |  |  |  |  |
Reduces retention |  |  |  |  |  |  |  |  |  | $ 700 |  |  |  |  |  |  |  |
Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reinstatement of premium protection |  |  |  |  |  |  |  |  | $ 4,500 |  |  | $ 10,500 |  |  |  |  |  | $ 400
Excess of catastrophe coverage |  |  |  |  |  |  |  |  | 5,500 |  |  | 10,000 |  |  |  |  |  | $ 600
Limited retention |  |  |  |  |  |  |  |  | $ 4,800 |  |  |  |  |  |  |  |  |
Forecast | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reduces retention |  |  |  |  |  |  |  |  |  |  |  | 530 |  |  |  |  |  |
Forecast | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reduces retention |  |  |  |  |  |  |  |  |  |  |  | $ 730 |  |  |  |  |  |
Catastrophe Reinsurance: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Initial loss subject to personal lines quota share treaty |  |  |  | $ 10,000 | $ 10,000 | $ 10,000 | $ 10,000 | $ 10,000 |  |  |  |  |  |  |  |  |  |
Risk retained per catastrophe occurrence |  |  |  | 9,500 | 8,750 | 8,750 | 7,400 | 7,400 |  |  |  |  |  |  |  |  |  |
Catastrophe loss coverage in excess of quota share coverage |  |  |  | $ 315,000 | $ 315,000 | $ 335,000 | $ 335,000 | $ 490,000 |  |  |  |  |  |  |  |  |  |
Reinstatement premium protection |  |  |  | Yes | Yes | Yes | Yes | Yes |  |  |  |  |  |  |  |  |  |
Catastrophe Reinsurance: | Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Initial loss subject to personal lines quota share treaty |  |  | $ 10,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Risk retained per catastrophe occurrence |  | $ 5,000 | 4,750 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Catastrophe loss coverage in excess of quota share coverage |  | $ 275,000 | $ 275,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reinstatement premium protection |  | Yes | Yes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Personal Lines: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Quota share treaty percent ceded |  |  |  | 27.00% | 30.00% | 30.00% | 30.00% | 30.00% |  |  |  |  |  |  | 30.00% |  | 30.00% |
Risk retained on initial $1,000,000 of losses |  |  |  | $ 730 | $ 700 | $ 700 | $ 700 | $ 700 |  |  |  |  |  |  |  |  |  |
Losses per occurrence subject to quota share reinsurance coverage |  |  |  | 1,000 | 1,000 | 1,000 | 1,000 | 1,000 |  |  |  |  |  |  |  |  |  |
Excess of loss coverage and facultative facility coverage |  |  |  | 8,400 | 8,400 | 8,400 | 8,400 | 8,400 |  |  |  |  |  |  |  |  |  |
in excess of 1 |  |  |  | 600 | 600 | 600 | 600 | 600 |  |  |  |  |  |  |  |  |  |
Total reinsurance coverage per occurrence |  |  |  | 8,470 | 8,500 | 8,500 | 8,500 | 8,500 |  |  |  |  |  |  |  |  |  |
Losses per occurrence subject to reinsurance coverage |  |  |  | $ 9,000 | $ 9,000 | $ 9,000 | $ 9,000 | $ 9,000 |  |  |  |  |  |  |  |  |  |
Quota share treaty percent excluded from percent ceded |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 17.50% |  | 4.00% |
Personal Lines: | Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Quota share treaty percent ceded |  |  | 27.00% |  |  |  |  |  |  |  | 27.00% |  | 27.00% |  |  |  |  |
Risk retained on initial $1,000,000 of losses |  | $ 1,000 | $ 730 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Losses per occurrence subject to quota share reinsurance coverage |  |  | 1,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Excess of loss coverage and facultative facility coverage |  | 8,000 | 8,400 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
in excess of 1 |  | 1,000 | 600 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total reinsurance coverage per occurrence |  | 8,000 | 8,470 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Losses per occurrence subject to reinsurance coverage |  | $ 9,000 | $ 9,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Quota share treaty percent excluded from percent ceded |  |  |  |  |  |  |  |  |  |  | 22.00% |  |  |  |  |  |  |

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- Definition Losses per occurrence subject to reinsurance coverage + References No definition available. + Details
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- Definition Quota Share Treaty Percent Excluded for Named Catastrophe from Percent Ceded + References No definition available. + Details
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