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Investment Securities - Available-for-Sale and Held-to-Maturity Investment Securities with Unrealized Losses by Aggregated Major Security Type and Length of Time in Continuous Unrealized Loss Position (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-Sale, Less than 12 Months, Fair Value	$ 654,262	$ 1,295,822
Available-for-Sale, Less than 12 Months, Unrealized Losses	(4,917)	(11,960)
Available-for-Sale, 12 months or longer, Fair Value	36,356	314,350
Available-for-Sale, 12 months or longer, Unrealized Losses	(6,468)	(9,700)
Available-for-Sale, Fair Value	690,618	1,610,172
Available-for-Sale, Unrealized Losses	(11,385)	(21,660)
U.S. Treasury
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-Sale, Less than 12 Months, Fair Value		999
Available-for-Sale, Less than 12 Months, Unrealized Losses		(2)
Available-for-Sale, 12 months or longer, Fair Value		0
Available-for-Sale, 12 months or longer, Unrealized Losses		0
Available-for-Sale, Fair Value		999
Available-for-Sale, Unrealized Losses	0	(2)
U.S. government-sponsored entities and agencies
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-Sale, Less than 12 Months, Fair Value	355,528	357,647
Available-for-Sale, Less than 12 Months, Unrealized Losses	(3,921)	(4,638)
Available-for-Sale, 12 months or longer, Fair Value	0	0
Available-for-Sale, 12 months or longer, Unrealized Losses	0	0
Available-for-Sale, Fair Value	355,528	357,647
Available-for-Sale, Unrealized Losses	(3,921)	(4,638)
Mortgage-backed securities
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-Sale, Less than 12 Months, Fair Value	275,833	786,245
Available-for-Sale, Less than 12 Months, Unrealized Losses	(895)	(6,122)
Available-for-Sale, 12 months or longer, Fair Value	3,572	212,056
Available-for-Sale, 12 months or longer, Unrealized Losses	(95)	(2,930)
Available-for-Sale, Fair Value	279,405	998,301
Available-for-Sale, Unrealized Losses	(990)	(9,052)
States and political subdivisions
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-Sale, Less than 12 Months, Fair Value	3,497	120,166
Available-for-Sale, Less than 12 Months, Unrealized Losses	(31)	(1,016)
Available-for-Sale, 12 months or longer, Fair Value	0	7,006
Available-for-Sale, 12 months or longer, Unrealized Losses	0	(31)
Available-for-Sale, Fair Value	3,497	127,172
Available-for-Sale, Unrealized Losses	(31)	(1,047)
Pooled trust preferred securities
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-Sale, Less than 12 Months, Fair Value	0	0
Available-for-Sale, Less than 12 Months, Unrealized Losses	0	0
Available-for-Sale, 12 months or longer, Fair Value	7,913	8,222
Available-for-Sale, 12 months or longer, Unrealized Losses	(5,850)	(5,589)
Available-for-Sale, Fair Value	7,913	8,222
Available-for-Sale, Unrealized Losses	(5,850)	(5,589)
Other securities
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-Sale, Less than 12 Months, Fair Value	19,404	30,765
Available-for-Sale, Less than 12 Months, Unrealized Losses	(70)	(182)
Available-for-Sale, 12 months or longer, Fair Value	24,871	87,066
Available-for-Sale, 12 months or longer, Unrealized Losses	(523)	(1,150)
Available-for-Sale, Fair Value	44,275	117,831
Available-for-Sale, Unrealized Losses	$ (593)	$ (1,332)

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Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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