Business Combinations - Narrative (Details) - USD ($) $ in Thousands	2 Months Ended	3 Months Ended
	Jun. 30, 2024	Mar. 31, 2024	Mar. 31, 2023
Business Acquisition [Line Items]
Merger-related expenses		$ 68	$ 295
Provident Financial Services, Inc. | Forecast
Business Acquisition [Line Items]
Business combination, regulatory conditions, Tier 2 qualifying subordinated debt issuance	$ 200,000
Banking regulation, Regulatory Capital Ratios, period to maintain	3 years
Business combination, regulatory conditions, Tier 1 Leverage Capital Ratio, minimum	8.50%
Business combination, regulatory conditions, Total Risk-Based Capital Ratio, minimum	11.25%
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)	0.8319