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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
Operating activities
Net cash provided by operating activities	$ 78,824	$ 98,268	$ 130,810
Investing activities
Purchases of property and equipment	(1,018)	(1,126)	(478)
Net cash provided by (used in) investing activities	11,688	(29,059)	(51,542)
Financing activities
Proceeds from stock option exercises	20	67
Finance lease purchases	(47)
Dividends to shareholders	(87,016)	(84,491)	(82,645)
Net cash used in financing activities	(87,043)	(84,424)	(82,645)
Change in cash and cash equivalents	3,469	(15,215)	(3,377)
Cash and cash equivalents at beginning of year	40,344	55,559	58,936
Cash and cash equivalents at end of year	43,813	40,344	55,559
Parent Company [Member]
Operating activities
Net cash provided by operating activities	2,333	2,448	15,138
Investing activities
Purchases of investments	(27,140)	(47,825)	(37,361)
Proceeds from sales of investments	1,987	54,600	33,000
Purchases of property and equipment	(995)	(1,041)	(277)
Dividends from subsidiary	115,900	65,400	78,900
Net cash provided by (used in) investing activities	89,752	71,134	74,262
Financing activities
Proceeds from stock option exercises	20	67
Finance lease purchases	(47)
Dividends to shareholders	(87,016)	(84,491)	(82,645)
Net cash used in financing activities	(87,043)	(84,424)	(82,645)
Change in cash and cash equivalents	5,042	(10,842)	6,755
Cash and cash equivalents at beginning of year	5,509	16,351	9,596
Cash and cash equivalents at end of year	$ 10,551	$ 5,509	$ 16,351

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