Goodwill and Other Intangibles - Changes In Intangible Assets (Detail) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Finite Lived Intangible Assets [Line Items]
Gross carrying amount	$ 88,805	$ 112,323
Accumulated amortization	19,753	41,311
Net carrying amount	69,052	71,012
Core Deposit Intangible Assets [Member]
Finite Lived Intangible Assets [Line Items]
Gross carrying amount	2,345	2,345
Accumulated amortization	1,251	1,135
Net carrying amount	1,094	1,210
Customer Relationships [Member]
Finite Lived Intangible Assets [Line Items]
Gross carrying amount	86,460	109,978
Accumulated amortization	18,502	40,176
Net carrying amount	$ 67,958	$ 69,802