Business - Additional Information (Detail) $ in Thousands	Jun. 30, 2022 USD ($) Location Subsidiary	Jan. 07, 2022 USD ($)	Dec. 31, 2021 USD ($)
Schedule Of Description Of Company [Line Items]
Number of inactive subsidiaries | Subsidiary	1
Bank operated banking centers | Location	63
Bank operated trust office locations, number | Location	4
Assets	$ 16,759,993		$ 15,883,697
Bank Owned Life Insurance	259,958		251,570
Goodwill	765,822		$ 663,707
Suncrest Bank [Member]
Schedule Of Description Of Company [Line Items]
Assets		$ 1,380,000
Acquired net loans at fair value	765,900	765,900
Fair Value of Acquired Investment Securities	131,100	131,100
Bank Owned Life Insurance	9,000	9,000
Goodwill	102,100
Deposit premium	3,900
Cash consideration	$ 39,600	$ 39,600