Liabilities for Losses and Loss Expenses - Liabilities for Losses and Loss Expenses (Details) - USD ($)	6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024
Liabilities for Losses and Loss Expenses [Abstract]
Balance at January 1	$ 1,120,985,050	$ 1,126,157,000
Less reinsurance recoverable	(416,621,000)	(437,014,000)
Net balance at January 1	704,364,000	689,143,000
Incurred related to:
Current year	296,423,000	325,407,000
Prior years	(13,473,000)	(9,150,000)
Total incurred	282,950,000	316,257,000
Paid related to:
Current year	121,284,000	129,555,000
Prior years	156,569,000	165,827,000
Total paid	277,853,000	295,382,000
Net balance at end of period	709,461,000	710,018,000
Plus reinsurance recoverable	407,549,000	437,401,000
Balance at end of period	$ 1,117,009,698	$ 1,147,419,000