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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, 2023
Dec. 31, 2022
Dec. 31, 2021
Condensed Financial Statements, Captions [Line Items]      
Net cash provided by (used in) operating activities $ 70,971 $ 324,515 $ 234,378
Cash flows from investing activities:      
Purchases of equity securities (33,455) (76,629) (55,447)
Purchases of available-for-sale debt securities (146,424) (200,011) (450,383)
Proceeds from sales of equity securities 45,095 34,178 85,103
Net cash provided by (used in) investing activities (15,251) (148,861) (229,404)
Cash flows from financing activities:      
Proceeds from issuance of long-term debt 0 0 100,000
Debt issuance costs paid 0 (140) (3,365)
Preferred stock dividend (10) (10) (10)
Common stock dividend (23,279) (23,774) (24,191)
Purchase of treasury stock (22,021) (11,643) (1,609)
Payments related to tax withholding for share-based compensation (339) (418) (1,056)
Net cash provided by (used in) financing activities (47,120) (37,456) 68,298
Net increase (decrease) during the period 8,600 138,198 73,272
Balance, beginning of period 391,341 253,143 179,871
Balance, end of period 399,941 391,341 253,143
Supplemental cash and non-cash flow disclosures:      
Interest paid 5,823 5,797 127
Parent Company      
Condensed Financial Statements, Captions [Line Items]      
Net cash provided by (used in) operating activities 205,614 210,368 151,952
Cash flows from investing activities:      
Capital contribution to affiliates (89,490) (129,490) (95,498)
Issuance of note receivable to subsidiary 0 (114,000) (20,000)
Purchases of equity securities (6,300) (33,189) 0
Purchases of available-for-sale debt securities (1,854) (4,026) 0
Proceeds from sales of equity securities 19,512 20,187 0
Net cash provided by (used in) investing activities (78,132) (260,518) (115,498)
Cash flows from financing activities:      
Proceeds from issuance of long-term debt 0 0 100,000
Debt issuance costs paid 0 (140) (3,365)
Preferred stock dividend (10) (10) (10)
Common stock dividend (23,279) (23,774) (24,191)
Purchase of treasury stock (22,021) (11,643) (1,609)
Payments related to tax withholding for share-based compensation (339) (418) (1,056)
Net cash provided by (used in) financing activities (45,649) (35,985) 69,769
Net increase (decrease) during the period 81,833 (86,135) 106,223
Balance, beginning of period 83,022 169,157 62,934
Balance, end of period 164,855 83,022 169,157
Supplemental cash and non-cash flow disclosures:      
Interest paid $ 5,625 $ 5,625 $ 0