Income Taxes - Schedule of Deferred Tax Assets and Deferred Tax Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Deferred tax assets:
Tax discounting of unpaid losses and settlement expenses	$ 29,524	$ 25,491
Unearned premium offset	36,086	32,763
Deferred compensation	4,630	4,170
Share-based compensation expense	3,685	3,556
Capitalized research and development costs	6,350	4,970
Lease liability	3,288	3,113
Other	3,864	2,949
Deferred tax assets before allowance	87,427	77,012
Total deferred tax assets	87,427	77,012
Deferred tax liabilities:
Net unrealized appreciation of securities	25,898	10,981
Deferred policy acquisition costs	34,905	30,779
Lease asset	2,943	2,870
Discounting of unpaid losses and settlement expenses - Tax Cuts and Jobs Act (TCJA) implementation offset	636	1,272
Fixed assets	2,908	2,745
Intangible assets	1,561	1,552
Undistributed earnings of unconsolidated investees	10,265	10,351
Other	518	590
Total deferred tax liabilities	79,634	61,140
Net deferred tax asset	$ 7,793	$ 15,872