Goodwill and Other Intangible Assets - Total Amortizing Intangible Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 261,000	$ 138,421
Accumulated Amortization	51,626	134,423
Net Carrying Amount	209,374	3,998
Core Deposit [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	218,000	131,664
Accumulated Amortization	40,875	127,746
Net Carrying Amount	177,125	3,918
Other [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	43,000	6,757
Accumulated Amortization	10,751	6,677
Net Carrying Amount	$ 32,249	$ 80