Goodwill and Other Intangibles - Changes In Intangible Assets (Detail) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023	Dec. 31, 2022
Finite Lived Intangible Assets [Line Items]
Gross carrying amount	$ 88,805		$ 112,323
Accumulated amortization	21,664		41,311
Net carrying amount	67,141	$ 71,012	71,012
Core Deposit Intangible Assets [Member]
Finite Lived Intangible Assets [Line Items]
Gross carrying amount	2,345		2,345
Accumulated amortization	1,368		1,135
Net carrying amount	977		1,210
Customer Relationships [Member]
Finite Lived Intangible Assets [Line Items]
Gross carrying amount	86,460		109,978
Accumulated amortization	20,296		40,176
Net carrying amount	$ 66,164		$ 69,802