Business Combinations - Narrative (Details) $ / shares in Units, $ in Thousands		3 Months Ended	12 Months Ended
	Jan. 06, 2022 USD ($) branch lease $ / shares shares	Jun. 30, 2023 USD ($) shares	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Business Acquisition [Line Items]
Assets			$ 10,783,840	$ 8,198,056
Deposits			8,567,471	6,965,823
Operating lease right-of-use assets			20,052	15,222
Operating lease liabilities			21,449	16,523
Provident Financial Services, Inc. (Combined) | Forecast
Business Acquisition [Line Items]
Assets		$ 25,000,000
Loans		18,000,000
Deposits		$ 20,000,000
Provident Financial Services, Inc. (Combined) | Provident Financial Services, Inc. | Forecast
Business Acquisition [Line Items]
Business combination, merger, shareholder interest in combined entity, ownership percentage		58.00%
Provident Financial Services, Inc. (Combined) | Lakeland Shareholders | Forecast
Business Acquisition [Line Items]
Business combination, merger, shareholder interest in combined entity, ownership percentage		42.00%
Lakeland Bancorp, Inc
Business Acquisition [Line Items]
Merger and acquisition integration-related expenses			4,000
Lakeland Bancorp, Inc | Forecast
Business Acquisition [Line Items]
Business combination, consideration transferred		$ 1,300,000
Lakeland Bancorp, Inc | Provident Financial Services, Inc. | Forecast
Business Acquisition [Line Items]
Business combination, consideration transferred, equity interests issued and issuable, entity shares issued per acquiree share (in shares) | shares		0.8319
1st Constitution Bancorp
Business Acquisition [Line Items]
Business combination, consideration transferred, equity interests issued and issuable, entity shares issued per acquiree share (in shares) | shares	1.3577
Merger and acquisition integration-related expenses			$ 4,600	$ 1,800
Number of operating bank branches | branch	25
Consideration paid through common stock (in shares) | shares	14,020,495
Business acquisition, share price (in usd per share) | $ / shares	$ 25.55
Business acquisition, average strike price (in usd per share) | $ / shares	$ 15.95
Net assets acquired	$ 559
Number of operating bank branches, owned premises | branch	8
Number of lease obligations | lease	17
Operating lease right-of-use assets	$ 13,000
Operating lease liabilities	13,000
Identifiable intangible assets	$ 9,018
Useful life	10 years