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Schedule II - Condensed Financial Information of Registrant - Condensed Statements of Cash Flows (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash flows from operating activities:
Net cash provided by (used in) operating activities	$ 324,515	$ 234,378	$ 29,348
Cash flows from investing activities:
Purchases of equity securities	(76,629)	(55,447)	(116,265)
Purchases of available-for-sale debt securities	(200,011)	(450,383)	(1,074,629)
Proceeds from sales of equity securities	34,178	85,103	81,559
Proceeds from sales of available-for-sale debt securities	29,439	96,966	1,008,436
Net cash provided by (used in) investing activities	(148,861)	(229,404)	22,042
Cash flows from financing activities:
Proceeds from issuance of long-term debt	0	100,000	0
Debt issuance costs paid	(140)	(3,365)	0
Preferred stock dividend	(10)	(10)	(10)
Common stock dividend	(23,774)	(24,191)	(24,547)
Purchase of treasury stock	(11,643)	(1,609)	(28,921)
Payments related to tax withholding for share-based compensation	(418)	(1,056)	(1,315)
Net cash provided by (used in) financing activities	(37,456)	68,298	(56,263)
Net increase (decrease) during the period	138,198	73,272	(4,873)
Balance, beginning of period	253,143	179,871	184,744
Balance, end of period	391,341	253,143	179,871
Supplemental cash and non-cash flow disclosures:
Interest paid	5,797	127	102
Parent Company
Cash flows from operating activities:
Net cash provided by (used in) operating activities	210,368	151,952	149,329
Cash flows from investing activities:
Capital contribution to affiliates	(129,490)	(95,498)	(118,897)
Issuance of note receivable to subsidiary	(114,000)	(20,000)	0
Purchases of equity securities	(33,189)	0	0
Purchases of available-for-sale debt securities	(4,026)	0	0
Proceeds from sales of equity securities	20,187	0	0
Proceeds from sales of available-for-sale debt securities	0	0	787
Net cash provided by (used in) investing activities	(260,518)	(115,498)	(118,110)
Cash flows from financing activities:
Proceeds from issuance of long-term debt	0	100,000	0
Debt issuance costs paid	(140)	(3,365)	0
Preferred stock dividend	(10)	(10)	(10)
Common stock dividend	(23,774)	(24,191)	(24,547)
Purchase of treasury stock	(11,643)	(1,609)	(28,921)
Payments related to tax withholding for share-based compensation	(418)	(1,056)	(1,315)
Net cash provided by (used in) financing activities	(35,985)	69,769	(54,793)
Net increase (decrease) during the period	(86,135)	106,223	(23,574)
Balance, beginning of period	169,157	62,934	86,508
Balance, end of period	83,022	169,157	62,934
Supplemental cash and non-cash flow disclosures:
Interest paid	$ 5,625	$ 0	$ 0

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