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Business - Additional Information (Detail) $ in Thousands	Mar. 31, 2023 USD ($) Center Subsidiary Location	Dec. 31, 2022 USD ($)	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
Total assets	$ 16,274,041	$ 16,476,540
Bank owned life insurance (BOLI)	256,717	255,528
Goodwill	$ 765,822	$ 765,822
Suncrest Bank [Member]
Schedule Of Description Of Company [Line Items]
Total assets			$ 1,380,000
Acquired net loans at fair value			765,900
Bank owned life insurance (BOLI)			9,000
Goodwill			102,100
Deposit premium			3,900
Cash consideration			39,600
Fair value of acquired investment securities			$ 131,100

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