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Intangible Assets - Schedule of Reconciliation of Goodwill (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Goodwill [Line Items]
Goodwill at December 31, 2024	$ 1,888,889,000
Addition to goodwill from Piedmont acquisition	129,959,000	$ 0	$ 0
Goodwill at December 31, 2025	2,018,848,000	1,888,889,000
Community Banking [Member]
Goodwill [Line Items]
Goodwill at December 31, 2024	1,888,889,000
Addition to goodwill from Piedmont acquisition	129,959,000
Goodwill at December 31, 2025	$ 2,018,848,000	$ 1,888,889,000

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