Schedule II - Statements of Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Operating activities
Net income	$ 52,170	$ 45,847	$ 6,257
Adjustments to reconcile net income to net cash provided by operating activities:
Stock-based compensation expense	11,624	5,584	2,167
Net realized and unrealized losses on investments	7,529	(1,277)	(1,488)
Amortization of premium on fixed maturity securities	1,607	2,317	1,214
Deferred income tax expense	(3,461)	641	1,094
Net cash provided by (used in) operating activities	169,583	87,814	57,493
Investing activities
Purchases of fixed maturity securities	(382,114)	(166,894)	(295,002)
Sales and maturities of fixed maturity securities	242,726	120,198	124,243
Net cash used in investing activities	(156,807)	(58,188)	(185,385)
Financing activities
Proceeds from common stock issued via equity incentive plans	760	719	741
Repurchase of common stock	(34,415)	(15,852)
Net cash provided by (used in) financing activities	5,017	(13,041)	128,329
Net increase in cash, cash equivalents and restricted cash	17,793	16,585	437
Cash, cash equivalents and restricted cash at beginning of period	50,371	33,786	33,349
Cash, cash equivalents and restricted cash at end of period	68,164	50,371	33,786
Supplementary cash flow information:
Cash paid for income taxes	18,890	2,104	7,182
Cash paid for interest	704
Parent Company
Operating activities
Net income	52,170	45,847	6,257
Adjustments to reconcile net income to net cash provided by operating activities:
Equity in undistributed earnings of subsidiaries	(76,270)	(75,594)	(13,917)
Stock-based compensation expense	8,820	4,755
Net realized and unrealized losses on investments	320	(217)	(63)
Amortization of premium on fixed maturity securities	347	443	350
Deferred income tax expense	7,210	634	1,094
Changes in operating assets and liabilities:	36,449	13,596	7,772
Net cash provided by (used in) operating activities	29,046	(10,536)	1,493
Investing activities
Purchases of fixed maturity securities	(9,807)	(2,177)	(71,048)
Sales and maturities of fixed maturity securities	8,488	11,396	6,651
Cash paid to subsidiaries		(15,595)	(59,789)
Cash received from subsidiaries		27,100
Net cash used in investing activities	(1,319)	20,724	(124,186)
Financing activities
Proceeds from common stock issued via equity incentive plans	3,032	2,811	2,782
Repurchase of common stock	(34,415)	(15,852)
Net cash provided by (used in) financing activities	(31,383)	(13,041)	128,329
Net increase in cash, cash equivalents and restricted cash	(3,656)	(2,853)	5,636
Cash, cash equivalents and restricted cash at beginning of period	4,437	7,290	1,654
Cash, cash equivalents and restricted cash at end of period	781	4,437	7,290
Supplementary cash flow information:
Cash paid for income taxes	18,890	$ 2,104	7,182
Cash paid for interest	$ 704
Stock Issued in January
Financing activities
Proceeds from stock offerings, net of offering costs			35,464
Stock Issued in January | Parent Company
Financing activities
Proceeds from stock offerings, net of offering costs			35,464
Stock Issued in June
Financing activities
Proceeds from stock offerings, net of offering costs			90,083
Stock Issued in June | Parent Company
Financing activities
Proceeds from stock offerings, net of offering costs			$ 90,083