Income Taxes - Schedule of Deferred Tax Assets and Deferred Tax Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Deferred tax assets:
Tax discounting of unpaid losses and settlement expenses	$ 23,788	$ 22,637
Unearned premium offset	27,158	23,080
Net unrealized depreciation of securities	19,839
Deferred compensation	4,058	3,469
Stock option expense	3,202	3,089
Capitalized research and development costs	2,544
Lease liability	3,026	3,796
Other	938	367
Deferred tax assets before allowance	84,553	56,438
Total deferred tax assets	84,553	56,438
Deferred tax liabilities:
Net unrealized appreciation of securities		76,533
Deferred policy acquisition costs	26,850	21,746
Lease asset	2,681	3,101
Discounting of unpaid losses and settlement expenses - Tax Cuts and Jobs Act (TCJA) implementation offset	1,909	2,545
Fixed assets	3,083	3,518
Intangible assets	1,543	1,537
Undistributed earnings of unconsolidated investees	7,399	29,515
Other	819	1,452
Total deferred tax liabilities	44,284	139,947
Net deferred tax asset	$ 40,269
Net deferred tax liability		$ (83,509)