Goodwill and Other Intangible Assets - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2023 USD ($) reportingUnit	Mar. 31, 2022 USD ($)	Dec. 31, 2022 USD ($)	Jan. 06, 2022 USD ($)
Acquired Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 271,829,000		$ 271,829,000
Number of reporting units | reportingUnit	1
Goodwill, impairment loss	$ 0	$ 0
Amortization of intangible assets	516,000	$ 596,000
1st Constitution Bancorp
Acquired Finite-Lived Intangible Assets [Line Items]
Goodwill				$ 115,600,000
Core Deposits
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets	$ 8,600,000		$ 9,100,000
Core Deposits | 1st Constitution Bancorp
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets				$ 9,000,000