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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

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