Goodwill and Other Intangibles - Changes in Carrying Amount of Goodwill (Detail) - USD ($) $ in Thousands		9 Months Ended	12 Months Ended
	Mar. 28, 2022	Sep. 30, 2022	Dec. 31, 2021	Dec. 31, 2020
Goodwill And Other Intangible Assets [Line Items]
Goodwill		$ 182,225	$ 174,518	$ 180,867
Branch acquisition	$ 7,700	7,707
Sale of component of business segment			(6,349)
Commercial Banking [Member]
Goodwill And Other Intangible Assets [Line Items]
Goodwill		63,113	59,419	59,419
Branch acquisition		3,694
Institutional Banking [Member]
Goodwill And Other Intangible Assets [Line Items]
Goodwill		51,332	51,332	51,332
Personal Banking [Member]
Goodwill And Other Intangible Assets [Line Items]
Goodwill		67,780	63,767	$ 70,116
Branch acquisition		$ 4,013
Sale of component of business segment			$ (6,349)