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Business - Additional Information (Detail) $ in Thousands	Sep. 30, 2023 USD ($) Center Location Subsidiary	Dec. 31, 2022 USD ($)	Jan. 07, 2022 USD ($)
Schedule Of Description Of Company [Line Items]
Number of inactive subsidiaries | Subsidiary	1
Bank operated banking centers | Center	62
Bank operated trust office locations, number | Location	3
Assets	$ 15,903,015	$ 16,476,540
Bank Owned Life Insurance	259,468	255,528
Goodwill	$ 765,822	$ 765,822
Suncrest Bank [Member]
Schedule Of Description Of Company [Line Items]
Assets			$ 1,380,000
Acquired net loans at fair value			765,900
Fair Value of Acquired Investment Securities			131,100
Bank Owned Life Insurance			9,000
Goodwill			102,100
Deposits Assets			3,900
Cash consideration			$ 39,600

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