Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Cash Flows From Operating Activities
Net income (loss)	$ (29,700)	$ 15,031	$ 80,594
Adjustments to reconcile net income to net cash provided by operating activities
Net accretion of bond premium	7,092	9,000	13,597
Depreciation and amortization	10,508	7,670	6,570
Stock-based compensation expense	3,246	2,826	3,444
Net investment (gains) losses	(1,547)	15,622	(47,383)
Net cash flows from trading investments	116,080	29,725	38,411
Deferred income tax benefit	(8,308)	(3,930)	5,632
Changes in:
Accrued investment income	(1,454)	(1,084)	1,219
Premiums receivable	(99,062)	(48,958)	521
Deferred policy acquisition costs	(22,307)	(12,779)	(4,352)
Reinsurance receivables	(52,316)	(43,138)	32,725
Prepaid reinsurance premiums	(16,382)	(1,972)	3,637
Income taxes receivable	9,955	960	33,816
Other assets	(34,403)	(8,136)	(43,865)
Losses, claims and loss settlement expenses	141,481	(16,991)	(63,866)
Unearned premiums	74,996	34,655	(25,112)
Accrued expenses and other liabilities	70,956	12,972	2,430
Deferred income taxes	0	(652)	(464)
Other, net	2,901	7,928	(7,637)
Cash from operating activities	201,436	(16,282)	(50,677)
Net cash provided by (used in) operating activities	171,736	(1,251)	29,917
Cash Flows From Investing Activities
Proceeds from sale of available-for-sale investments	77,388	83,559	180,514
Proceeds from call and maturity of available-for-sale investments	80,081	184,210	264,237
Proceeds from short-term and other investments	4,615	12,648	6,387
Purchase of available-for-sale investments	(273,081)	(284,054)	(395,787)
Purchase of mortgage loans	(8,137)	(103)	0
Purchase of short-term and other investments	(19,866)	(13,294)	(9,644)
Net purchases and sales of property and equipment	(10,886)	(2,137)	(13,976)
Net cash provided by (used in) investing activities	(149,886)	(19,171)	31,731
Cash Flows From Financing Activities
Borrowings of long-term debt	0	0	0
Payment of cash dividends	(16,164)	(15,860)	(15,064)
Repurchase of common stock	0	0	(2,007)
Issuance of common stock	(290)	828	(421)
Net cash provided by (used in) financing activities	(16,454)	(15,032)	(17,492)
Net Change in Cash and Cash Equivalents	5,396	(35,454)	44,156
Cash and Cash Equivalents at Beginning of Year	96,650	132,104	87,948
Cash and Cash Equivalents at End of Year	102,046	96,650	132,104
Supplemental Cash Flow Information [Abstract]
Income taxes paid	1,348	21,548	5,360
Interest paid	$ 3,260	$ 3,188	$ 3,187