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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, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Cash flows from operating activities: |  |  |
Net cash provided by (used in) operating activities | $ 29,348 | $ 84,598 | $ 230,105
Cash flows from investing activities: |  |  |
Capital contributions to affiliates | (114,000) | 0 | 0
Purchases of equity securities | (116,265) | (1,351) | (25,803)
Purchases of available-for-sale debt securities | (1,074,629) | (221,647) | (437,635)
Proceeds from sales of equity securities | 81,559 | 29,680 | 8,285
Proceeds from sales of available-for-sale debt securities | 1,008,436 | 77,790 | 134,591
Net cash provided by (used in) investing activities | 22,042 | 28,326 | (212,286)
Cash flows from financing activities: |  |  |
Preferred stock dividend | (10) | (10) | (10)
Common stock dividend | (24,547) | (26,106) | (25,508)
Cash received for strike price and tax withholdings | 0 | 238 | 120
Purchase of treasury stock | (28,921) | (66,186) | (25,276)
Payments related to tax withholding for share-based compensation | (1,315) | (3,709) | (12,714)
Net cash provided by (used in) financing activities | (56,263) | (97,243) | (64,877)
Net increase (decrease) during the period | (4,873) | 15,681 | (47,058)
Balance, beginning of period | 184,744 | 169,063 | 216,121
Balance, end of period | 179,871 | 184,744 | 169,063
Parent Company [Member] |  |  |
Cash flows from operating activities: |  |  |
Net cash provided by (used in) operating activities | 149,329 | 84,752 | 87,306
Cash flows from investing activities: |  |  |
Capital contributions to affiliates | (118,897) | 0 | 0
Purchases of equity securities | 0 | (107) | (35)
Purchases of available-for-sale debt securities | 0 | (3,750) | 0
Proceeds from sales of equity securities | 0 | 3,481 | 0
Proceeds from sales of available-for-sale debt securities | 787 | 6,530 | 0
Net cash provided by (used in) investing activities | (118,110) | 6,154 | (35)
Cash flows from financing activities: |  |  |
Preferred stock dividend | (10) | (10) | (10)
Common stock dividend | (24,547) | (26,106) | (25,508)
Cash received for strike price and tax withholdings | 0 | 239 | 102
Purchase of treasury stock | (28,921) | (66,186) | (25,276)
Payments related to tax withholding for share-based compensation | (1,315) | (3,709) | (12,714)
Net cash provided by (used in) financing activities | (54,793) | (95,772) | (63,406)
Net increase (decrease) during the period | (23,574) | (4,866) | 23,865
Balance, beginning of period | 86,508 | 91,374 | 67,509
Balance, end of period | $ 62,934 | $ 86,508 | $ 91,374

X
- Definition Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage. Excludes amount for disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3521-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3044-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=121583591&loc=SL98516268-108586 + Details
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- Definition Amount of increase (decrease) in cash, cash equivalents, and cash and cash equivalents restricted to withdrawal or usage; including effect from exchange rate change. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 230 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=98513438&loc=d3e33268-110906 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3521-108585 + Details
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- Definition Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3521-108585 + Details
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