General - Narrative (Details)			3 Months Ended			6 Months Ended
	May 31, 2023 USD ($) ft²	Mar. 31, 2023 USD ($) ft²	Jun. 30, 2023 USD ($) $ / shares shares	Mar. 31, 2023 USD ($) ft²	Jun. 30, 2022 USD ($) $ / shares shares	Jun. 30, 2023 USD ($) $ / shares shares	Jun. 30, 2022 USD ($) $ / shares shares	Dec. 31, 2022 USD ($)	Mar. 08, 2017
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Incremental shares excluded from diluted earnings per share (in shares) | shares					2,276		3,012
Potentially dilutive securities (in shares) | shares			17,500			17,500
Common stock dividends (in dollars per share) | $ / shares			$ 0.3175		$ 0.6350	$ 0.6350	$ 1.2700
Policy acquisition costs			$ 172,737,000		$ 156,482,000	$ 337,245,000	$ 318,574,000
Advertising expenses			2,300,000		3,800,000	4,200,000	7,800,000
Net gains (losses) on sales of fixed assets						5,855,000	(85,000)
Sale price received in cash						29,871,000	3,000
Interest rate									4.40%
Reinsurance reimbursable amount			30,000,000			$ 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
Ceded			24,000,000		17,000,000	47,000,000	35,000,000
Policyholder Benefits and Claims Incurred, Assumed and Ceded			(3,000,000)		(6,000,000)	4,000,000	(13,000,000)
Revenue from contract with customer			5,000,000		4,600,000	9,800,000	9,000,000
Cost of goods and services sold			2,700,000		$ 2,800,000	5,500,000	$ 5,600,000
Contract with customer, liability			0			0		$ 0
Contract with customer, asset			0			0		0
Revenue, remaining performance obligation			0			0		0
Promissory Note
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Interest rate		7.00%		7.00%
Promissory note, term (in years)				4 years
Clearwater, Florida Office Building
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Sale leaseback transaction, area of property leased back | ft²		14,883		14,883
Sale leaseback transaction, percentage of property sold that has been leased back		9.00%
Sale leaseback transaction, lease term (in years)		5 years
Sale leaseback transaction, annual base rent		$ 400,000
Clearwater, Florida 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								$ 20,200,000
Net gains (losses) on sales of fixed assets				$ (1,800,000)
Clearwater, Florida Office Building | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Sale price of fixed asset		19,600,000		19,600,000
Promissory note received from sale of fixed asset				9,800,000
Sale price received in cash						8,500,000
Ranch Cucamonga, California Office Building
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Sale leaseback transaction, area of property leased back | ft²	6,000
Sale leaseback transaction, percentage of property sold that has been leased back	5.00%
Sale leaseback transaction, lease term (in years)	2 years
Sale leaseback transaction, annual base rent	$ 200,000
Ranch Cucamonga, 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		$ 13,600,000		$ 13,600,000
Ranch Cucamonga, California Office Building | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Sale price of fixed asset	$ 22,300,000
Net gains (losses) on sales of fixed assets			$ 7,900,000			7,900,000
Sale price received in cash						$ 21,400,000