Loans - Narrative (Details)			12 Months Ended
	Dec. 31, 2022 USD ($) loan	Jan. 06, 2022 USD ($)	Dec. 31, 2022 USD ($) contract loan	Dec. 31, 2021 USD ($) contract loan	Dec. 31, 2020 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accrued interest receivable on loans	$ 24,500,000		$ 24,500,000	$ 13,900,000
Net deferred loan fees	2,100,000		2,100,000	(5,800,000)
Overdraft balances included in home equity and consumer loans	1,300,000		1,300,000	184,000
Residential loans pledged for potential borrowings at the Federal Home Loan Bank of New York	2,890,000,000		2,890,000,000	2,300,000,000
Amortized cost basis of loans > 89 days past due but still accruing	0		0	1,000
Financing receivable, nonaccrual, in the process of foreclosure	898,000		898,000	930,000
PCD loans		$ 124,431,000
Financing receivable, troubled debt restructuring	2,600,000		$ 2,600,000	3,500,000
Financing receivable, accrual, troubled debt restructuring				3,300,000
Financing receivable nonaccrual troubled debt restructuring				$ 127,000
Financing Receivable, Modifications, Number of Contracts | contract				1
Financing receivable, troubled debt restructuring, subsequent default, number of contracts | contract			0	0
Loans to related parties	67,500,000		$ 67,500,000	$ 64,000,000
Loans to related parties, additions			15,300,000
Repayment of loan from related parties			11,800,000
Loans held for sale	536,000		536,000	1,943,000
Residential real estate acquired through disclosure	0		0	0
Other repossessed assets owned	0		0	0
Writedown of other repossessed assets			0	0	$ 39,000
COVID-19
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, deferred	0		0
1st Constitution Bancorp
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCD loans	83,100,000
Paycheck Protection Program ("PPP")
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, excluding accrued interest, before allowance for credit loss, fee, and loan in process	$ 435,000		$ 435,000	$ 56,600,000
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loans still accruing | loan	0		0	1
Amortized cost basis of loans > 89 days past due but still accruing	$ 0		$ 0	$ 1,000
Financing receivable, troubled debt restructuring				$ 115,000
Financing Receivable, Modifications, Number of Contracts | contract			0