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Goodwill and Other Intangible Assets - Additional Information (Detail)
3 Months Ended 9 Months Ended
Sep. 30, 2022
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2022
USD ($)
reportingUnit
Sep. 30, 2021
USD ($)
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 581,000 $ 211,000 1,770,000 $ 658,000    
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 $ 9,700,000   $ 9,700,000     $ 2,400,000
Core Deposits | 1st Constitution Bancorp            
Acquired Finite-Lived Intangible Assets [Line Items]            
Intangible assets         $ 9,000,000