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Other Comprehensive Income (Components of AOCI) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 1,410,407	$ 1,391,446	$ 1,413,840	$ 1,358,980
Current - period other comprehensive income	537	2,786	9,510	19,098
Reclassification of unrealized gains on equity securities due to the adoption of ASU No. 2016-01	1,410,407	1,397,833	1,413,840	1,358,980
Ending Balance	1,601,569	1,397,833	1,601,569	1,397,833
Unrealized Gains (Losses) on Available for Sale Debt Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	24,562	7,635	8,746	(9,605)
Current - period other comprehensive income	(428)	2,614	15,388	19,854
Reclassification of unrealized gains on equity securities due to the adoption of ASU No. 2016-01	24,134	10,249	8,746	(9,605)
Ending Balance	24,134	10,249	24,134	10,249
Post- Retirement Obligations
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(5,086)	(3,603)	(5,240)	(3,625)
Current - period other comprehensive income	85	35	239	57
Reclassification of unrealized gains on equity securities due to the adoption of ASU No. 2016-01	(5,001)	(3,568)	(5,001)	(3,568)
Ending Balance	(5,001)	(3,568)	(5,001)	(3,568)
Unrealized (Losses) Gains on Derivatives (cash flow hedges)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(6,682)	(56)	315	894
Current - period other comprehensive income	880	137	(6,117)	(813)
Reclassification of unrealized gains on equity securities due to the adoption of ASU No. 2016-01	(5,802)	81	(5,802)	81
Ending Balance	(5,802)	81	(5,802)	81
Accumulated Other Comprehensive Income
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	12,794	3,976	3,821	(12,336)
Current - period other comprehensive income	537	2,786	9,510	19,098
Reclassification of unrealized gains on equity securities due to the adoption of ASU No. 2016-01	13,331	6,762	13,331	6,762
Ending Balance	$ 13,331	$ 6,762	$ 13,331	$ 6,762

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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No definition available.

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Amount after tax and reclassification adjustments of other comprehensive income (loss).

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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