Allowance for Credit Losses - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021	Dec. 31, 2020
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, collectively evaluated for impairment	$ 7,282,330		$ 7,282,330			$ 5,954,950
Financing receivable, allowance for credit losses, collectively evaluated for impairment	62,233		62,233			53,796
Financing receivable, individually evaluated for impairment and acquired with deteriorated credit quality	126,200		126,200
Financing receivable, allowance for credit losses, individually evaluated for impairment and acquired with deteriorated credit quality	6,600		6,600
Loans, individually evaluated for impairment	21,199		21,199			20,261
Allowance for credit losses, Individually evaluated for impairment	6,603		6,603			4,251
Charge-offs	369	$ 1,861	8,173	$ 3,132
Allowance for credit loss, available for sale	2,802	21	2,802	21	$ 1,267	83	$ 144	$ 2
Allowance for credit loss, held to maturity	190	137	190	137	$ 199	181	$ 0	$ 0
Debt securities, accrued interest after allowance for credit loss	8,200		8,200			5,300
Off-balance sheet, credit loss, liability	3,300		3,300			$ 2,300
Off-balance sheet, credit loss, liability, credit loss expense (reversal)	535	(659)	975	(635)
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans, individually evaluated for impairment	105,000		105,000
Allowance for credit losses, Individually evaluated for impairment	3,700		3,700
Charge-offs	$ 369	1,861	539	3,132
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | 1st Constitution Bancorp
Financing Receivable, Allowance for Credit Loss [Line Items]
Charge-offs			$ 7,600
Nonperforming Financial Instruments
Financing Receivable, Allowance for Credit Loss [Line Items]
Charge-offs		75		$ 1,200
Loans sold		$ 5,000