Goodwill and Other Intangible Assets - Additional Information (Detail)	3 Months Ended		6 Months Ended
	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($) reportingUnit	Jun. 30, 2021 USD ($)	Jan. 06, 2022 USD ($)	Dec. 31, 2021 USD ($)
Acquired Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 271,829,000		$ 271,829,000			$ 156,277,000
Number of reporting units | reportingUnit			1
Goodwill, impairment loss	0	$ 0	$ 0	$ 0
Amortization of intangible assets	593,000	$ 221,000	1,189,000	$ 447,000
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	$ 10,200,000		$ 10,200,000			$ 2,400,000
Core Deposits | 1st Constitution Bancorp
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets					$ 9,000,000