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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

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