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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, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash flows from operating activities:
Net cash provided by (used in) operating activities	$ 84,598	$ 230,105	$ 245,010
Cash flows from investing activities:
Purchases of equity securities	(1,351)	(25,803)	(89,302)
Purchases of available-for-sale debt securities	(221,647)	(437,635)	(180,604)
Proceeds from sales of equity securities	29,680	8,285	77,640
Proceeds from sales of available-for-sale debt securities	77,790	134,591	26,179
Net cash provided by (used in) investing activities	28,326	(212,286)	(85,709)
Cash flows from financing activities:
Repayment of debt	(1,471)	(1,471)	(2,170)
Preferred stock dividend	(10)	(10)	(10)
Common stock dividend	(26,106)	(25,508)	(24,001)
Cash received for strike price and tax withholdings	238	120	0
Purchase of treasury stock	(66,186)	(25,276)	(18,141)
Payments related to tax withholding for share-based compensation	(3,709)	(12,714)	(7,223)
Net cash provided by (used in) financing activities	(97,243)	(64,877)	(51,545)
Net increase (decrease) during the period	15,681	(47,058)	107,756
Balance, beginning of period	169,063	216,121	108,365
Balance, end of period	184,744	169,063	216,121
Parent Company [Member]
Cash flows from operating activities:
Net cash provided by (used in) operating activities	84,752	87,306	117,668
Cash flows from investing activities:
Purchases of equity securities	(107)	(35)	(4,990)
Purchases of available-for-sale debt securities	(3,750)	0	(3,000)
Proceeds from sales of equity securities	3,481	0	3,255
Proceeds from sales of available-for-sale debt securities	6,530	0	0
Net cash provided by (used in) investing activities	6,154	(35)	(4,735)
Cash flows from financing activities:
Preferred stock dividend	(10)	(10)	(10)
Common stock dividend	(26,106)	(25,508)	(24,001)
Cash received for strike price and tax withholdings	239	102	0
Purchase of treasury stock	(66,186)	(25,276)	(18,141)
Payments related to tax withholding for share-based compensation	(3,709)	(12,714)	(7,223)
Net cash provided by (used in) financing activities	(95,772)	(63,406)	(49,375)
Net increase (decrease) during the period	(4,866)	23,865	63,558
Balance, beginning of period	91,374	67,509	3,951
Balance, end of period	$ 86,508	$ 91,374	$ 67,509

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