General - Narrative (Details) - USD ($)	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Potentially dilutive securities (in shares)	0	17,500
Common stock dividends (in dollars per share)	$ 0.3175	$ 0.3175
Policy acquisition costs	$ 196,040,000	$ 164,507,000
Advertising expenses	3,300,000	1,900,000
Reinsurance reimbursable amount	$ 30,000,000
Reinsurance retention policy, threshold loss ratio	73.50%
Reinsurance retention policy, excess retention, amount reinsured	$ 1,111,000,000
Reinsurance policy, amount retained	$ 100,000,000
Losses retained by the Company (in percent)	95.00%
Ceded premiums earned	$ 31,100,000	23,200,000
Losses and loss adjustment expenses, assumed and ceded	(800,000)	7,500,000
Revenue from contract with customer	5,700,000	4,800,000
Cost of goods and services sold	3,200,000	2,900,000
Contract with customer, asset	0		$ 0
Contract with customer, liability	0		0
Revenue, remaining performance obligation	0		$ 0
Accrued interest receivable considered uncollectible or written off	0	$ 0
Minimum
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Reinsurance policy, amount retained	100,000,000
Maximum
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Reinsurance policy, amount retained	140,000,000
Brea, California Office Building | Disposal Group, Held-for-sale, Not Discontinued Operations
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Fixed asset classified as held for sale	$ 10,800,000