Investment Securities (Disclosure Regarding Length of Time on Securities Available for Sale with Temporary Impairment) (Detail) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, fair value	$ 1,688,777	$ 1,277,160
Less than 12 months, gross unrealized losses	(104,572)	(16,516)
12 months or longer, fair value	162,037	33,850
12 months or longer, gross unrealized losses	(14,336)	(1,387)
Total, fair value	1,850,815	1,311,010
Total, gross unrealized losses	(118,908)	(17,903)
U.S. Treasury obligations
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, fair value	260,165	98,621
Less than 12 months, gross unrealized losses	(14,711)	(866)
12 months or longer, fair value	0	0
12 months or longer, gross unrealized losses	0	0
Total, fair value	260,165	98,621
Total, gross unrealized losses	(14,711)	(866)
Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, fair value	1,352,508	1,147,403
Less than 12 months, gross unrealized losses	(84,395)	(15,176)
12 months or longer, fair value	155,913	33,850
12 months or longer, gross unrealized losses	(13,665)	(1,387)
Total, fair value	1,508,422	1,181,253
Total, gross unrealized losses	(98,060)	(16,563)
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, fair value	1,810	1,930
Less than 12 months, gross unrealized losses	(98)	(5)
12 months or longer, fair value	0	0
12 months or longer, gross unrealized losses	0	0
Total, fair value	1,810	1,930
Total, gross unrealized losses	(98)	(5)
State and municipal obligations
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, fair value	60,024	10,732
Less than 12 months, gross unrealized losses	(4,638)	(122)
12 months or longer, fair value	0	0
12 months or longer, gross unrealized losses	0	0
Total, fair value	60,024	10,732
Total, gross unrealized losses	(4,638)	(122)
Corporate obligations
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, fair value	14,270	18,474
Less than 12 months, gross unrealized losses	(730)	(347)
12 months or longer, fair value	6,124	0
12 months or longer, gross unrealized losses	(671)	0
Total, fair value	20,394	18,474
Total, gross unrealized losses	$ (1,401)	$ (347)

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=124269663&loc=SL82922890-210455

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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