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Investment Securities - Available-for-Sale Investment Securities with Unrealized Losses by Aggregated Major Security Type and Length of Time in Continuous Unrealized Loss Position (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Available-for-Sale, Less than 12 Months, Fair Value	$ 2,651,373	$ 654,262
Available-for-Sale, Less than 12 Months, Unrealized Losses	(76,370)	(4,917)
Available-for-Sale, 12 months or longer, Fair Value	46,786	36,356
Available-for-Sale, 12 months or longer, Unrealized Losses	(6,052)	(6,468)
Available-for-Sale, Fair Value	2,698,159	690,618
Available-for-Sale, Unrealized Losses	(82,422)	(11,385)
U.S. Treasury
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Available-for-Sale, Less than 12 Months, Fair Value	131,593
Available-for-Sale, Less than 12 Months, Unrealized Losses	(8,337)
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	131,593
Available-for-Sale, Unrealized Losses	(8,337)	0
U.S. government-sponsored entities and agencies
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Available-for-Sale, Less than 12 Months, Fair Value	1,086,560	355,528
Available-for-Sale, Less than 12 Months, Unrealized Losses	(42,518)	(3,921)
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	1,086,560	355,528
Available-for-Sale, Unrealized Losses	(42,518)	(3,921)
Mortgage-backed securities
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Available-for-Sale, Less than 12 Months, Fair Value	1,203,839	275,833
Available-for-Sale, Less than 12 Months, Unrealized Losses	(20,331)	(895)
Available-for-Sale, 12 months or longer, Fair Value	3,918	3,572
Available-for-Sale, 12 months or longer, Unrealized Losses	(88)	(95)
Available-for-Sale, Fair Value	1,207,757	279,405
Available-for-Sale, Unrealized Losses	(20,419)	(990)
States and political subdivisions
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Available-for-Sale, Less than 12 Months, Fair Value	186,505	3,497
Available-for-Sale, Less than 12 Months, Unrealized Losses	(4,293)	(31)
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	186,505	3,497
Available-for-Sale, Unrealized Losses	(4,293)	(31)
Pooled trust preferred securities
Debt Securities, Available-for-sale, Unrealized Loss Position [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	8,210	7,913
Available-for-Sale, 12 months or longer, Unrealized Losses	(5,543)	(5,850)
Available-for-Sale, Fair Value	8,210	7,913
Available-for-Sale, Unrealized Losses	(5,543)	(5,850)
Other securities
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Available-for-Sale, Less than 12 Months, Fair Value	42,876	19,404
Available-for-Sale, Less than 12 Months, Unrealized Losses	(891)	(70)
Available-for-Sale, 12 months or longer, Fair Value	34,658	24,871
Available-for-Sale, 12 months or longer, Unrealized Losses	(421)	(523)
Available-for-Sale, Fair Value	77,534	44,275
Available-for-Sale, Unrealized Losses	$ (1,312)	$ (593)

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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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