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Accumulated Other Comprehensive Income (Loss) - Schedule of AOCI (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 2,972,656	$ 2,852,453
Other comprehensive income (loss) before reclassifications	(54,234)	86,255
Amounts reclassified from AOCI to income	(1,628)	(4,305)
Ending balance	2,979,447	2,823,435
Accumulated Other Comprehensive Income (Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	147,771	56,207
Ending balance	91,909	138,157
Unrealized Gains and Losses on Available- for-Sale Debt Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	145,335	56,131
Other comprehensive income (loss) before reclassifications	(57,287)	80,369
Amounts reclassified from AOCI to income	(1,553)	(4,000)
Ending balance	86,495	132,500
Gains and Losses on Cash Flow Hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	2,584	240
Other comprehensive income (loss) before reclassifications	3,053	5,886
Amounts reclassified from AOCI to income	(112)	(325)
Ending balance	5,525	5,801
Defined Benefit Pension Plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(148)	(164)
Other comprehensive income (loss) before reclassifications	0	0
Amounts reclassified from AOCI to income	37	20
Ending balance	$ (111)	$ (144)

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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