Goodwill and Other Intangible Assets - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2022 USD ($) reportingUnit	Mar. 31, 2021 USD ($)	Jan. 06, 2022 USD ($)	Dec. 31, 2021 USD ($)
Acquired Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 271,829,000			$ 156,277,000
Number of reporting units | reportingUnit	1
Goodwill, impairment loss	$ 0	$ 0
Amortization of intangible assets	596,000	226,000
1st Constitution Bancorp
Acquired Finite-Lived Intangible Assets [Line Items]
Goodwill			$ 115,552,000
Core Deposits
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets	10,800,000			$ 2,400,000
Amortization of intangible assets	$ 596,000	$ 226,000
Core Deposits | 1st Constitution Bancorp
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets			$ 9,000,000