Property and Casualty Insurance Activity - Incurred and Paid Claims Development, Net of Reinsurance (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2024 USD ($) claim
Effects of Reinsurance [Line Items]
Total incurred claims	$ 578,500
2015
Effects of Reinsurance [Line Items]
2015 incurred claims	22,340
Total incurred claims	23,506
IBNR	$ 300
Cumulative Number of Reported Claims by Accident Year | claim	2,559
2016
Effects of Reinsurance [Line Items]
2015 incurred claims	$ 21,994
2016 incurred claims	26,062
Total incurred claims	27,281
IBNR	$ 121
Cumulative Number of Reported Claims by Accident Year | claim	2,882
2017
Effects of Reinsurance [Line Items]
2015 incurred claims	$ 22,148
2016 incurred claims	24,941
2017 incurred claims	31,605
Total incurred claims	37,201
IBNR	$ 246
Cumulative Number of Reported Claims by Accident Year | claim	3,401
2018
Effects of Reinsurance [Line Items]
2015 incurred claims	$ 22,491
2016 incurred claims	24,789
2017 incurred claims	32,169
2018 incurred claims	54,455
Total incurred claims	61,381
IBNR	$ 930
Cumulative Number of Reported Claims by Accident Year | claim	4,237
2019
Effects of Reinsurance [Line Items]
2015 incurred claims	$ 23,386
2016 incurred claims	27,887
2017 incurred claims	35,304
2018 incurred claims	56,351
2019 incurred claims	75,092
Total incurred claims	73,900
IBNR	$ 1,436
Cumulative Number of Reported Claims by Accident Year | claim	4,507
2020
Effects of Reinsurance [Line Items]
2015 incurred claims	$ 23,291
2016 incurred claims	27,966
2017 incurred claims	36,160
2018 incurred claims	58,441
2019 incurred claims	72,368
2020 incurred claims	63,083
Total incurred claims	63,677
IBNR	$ 1,078
Cumulative Number of Reported Claims by Accident Year | claim	5,892
2021
Effects of Reinsurance [Line Items]
2015 incurred claims	$ 23,528
2016 incurred claims	27,417
2017 incurred claims	36,532
2018 incurred claims	59,404
2019 incurred claims	71,544
2020 incurred claims	62,833
2021 incurred claims	96,425
Total incurred claims	96,365
IBNR	$ 3,056
Cumulative Number of Reported Claims by Accident Year | claim	5,827
2022
Effects of Reinsurance [Line Items]
2015 incurred claims	$ 23,533
2016 incurred claims	27,352
2017 incurred claims	36,502
2018 incurred claims	61,237
2019 incurred claims	71,964
2020 incurred claims	63,217
2021 incurred claims	96,673
2022 incurred claims	79,835
Total incurred claims	78,931
IBNR	$ 5,312
Cumulative Number of Reported Claims by Accident Year | claim	4,706
2023
Effects of Reinsurance [Line Items]
2015 incurred claims	$ 23,428
2016 incurred claims	27,271
2017 incurred claims	36,819
2018 incurred claims	61,145
2019 incurred claims	73,310
2020 incurred claims	63,562
2021 incurred claims	96,134
2022 incurred claims	78,759
2023 incurred claims	78,978
Total incurred claims	74,170
IBNR	$ 12,761
Cumulative Number of Reported Claims by Accident Year | claim	4,068
2024
Effects of Reinsurance [Line Items]
Total incurred claims	$ 42,089
IBNR	$ 11,852
Cumulative Number of Reported Claims by Accident Year | claim	2,396