Goodwill and Other Intangibles - Changes in Carrying Amount of Goodwill (Detail) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Goodwill And Other Intangible Assets [Line Items]
Goodwill	$ 207,385	$ 207,385
Goodwill	207,385	207,385
Commercial Banking [Member]
Goodwill And Other Intangible Assets [Line Items]
Goodwill	63,113	63,113
Goodwill	63,113	63,113
Institutional Banking [Member]
Goodwill And Other Intangible Assets [Line Items]
Goodwill	76,492	76,492
Goodwill	76,492	76,492
Personal Banking [Member]
Goodwill And Other Intangible Assets [Line Items]
Goodwill	67,780	67,780
Goodwill	$ 67,780	$ 67,780