Liability for Losses and Loss Expenses, Reconciliation of Net Incurred and Paid Claims Development Tables to Liability for Claims and Claim Adjustment Expenses (Details) - USD ($)	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Reconciliation of Net Incurred and Paid Claims Development [Abstract]
Net outstanding liabilities	$ 636,711,000
Reinsurance recoverable	418,387,000
Unallocated loss adjustment expenses	71,059,000
Gross liability for unpaid losses and loss expenses	1,126,156,838	$ 1,121,045,758	$ 1,077,620,301	$ 962,007,437
Personal Automobile [Member]
Reconciliation of Net Incurred and Paid Claims Development [Abstract]
Net outstanding liabilities	104,457,000
Reinsurance recoverable	98,157,000
Homeowners [Member]
Reconciliation of Net Incurred and Paid Claims Development [Abstract]
Net outstanding liabilities	25,294,000
Reinsurance recoverable	15,325,000
Commercial Automobile [Member]
Reconciliation of Net Incurred and Paid Claims Development [Abstract]
Net outstanding liabilities	157,172,000
Reinsurance recoverable	94,517,000
Commercial Multi-Peril [Member]
Reconciliation of Net Incurred and Paid Claims Development [Abstract]
Net outstanding liabilities	201,748,000
Reinsurance recoverable	118,979,000
Workers Compensation [Member]
Reconciliation of Net Incurred and Paid Claims Development [Abstract]
Net outstanding liabilities	113,124,000
Reinsurance recoverable	84,766,000
Other [Member]
Reconciliation of Net Incurred and Paid Claims Development [Abstract]
Net outstanding liabilities	34,916,000
Reinsurance recoverable	$ 6,643,000