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Subordinated Debentures (Details) - USD ($)
$ in Thousands
 12 Months Ended
May 16, 2024
May 09, 2024
Aug. 03, 2015
Dec. 31, 2025
Dec. 31, 2024
Debt Instrument [Line Items]          
Subordinated debentures       $ 406,582 $ 401,608
Subordinated Debt | Lakeland Bancorp Capital Trust IV          
Debt Instrument [Line Items]          
Extinguishment of debt     $ 10,000    
Subordinated Debt | Fixed-To-Floating Rate Subordinated Notes Due 2034          
Debt Instrument [Line Items]          
Principal amount   $ 225,000      
Interest rate (as a percent)   9.00%      
Proceeds from long-term borrowings   $ 221,200      
Basis spread on variable rate   4.765%      
Debt issuance costs   $ 3,800      
Amortization expense       $ 783  
Subordinated Debt | Fixed-To-Floating Rate Subordinated Notes Due September 2031          
Debt Instrument [Line Items]          
Principal amount $ 150,000        
Interest rate (as a percent) 2.875%        
Basis spread on variable rate 2.20%        
Subordinated Debt | Variable Rate Capital Trust Pass Through Securities, Established June 2006 | First Constitution Capital Trust II          
Debt Instrument [Line Items]          
Principal amount $ 18,000        
Subordinated Debt | Variable Rate Capital Trust Pass Through Securities, Established June 2003 | Lakeland Bancorp Capital Trust II          
Debt Instrument [Line Items]          
Principal amount 20,000        
Subordinated Debt | Variable Rate Capital Trust Pass Through Securities, Established May 2007 | Lakeland Bancorp Capital Trust IV          
Debt Instrument [Line Items]          
Principal amount 20,000        
Subordinated Debt | Variable Rate Capital Trust Pass Through Securities, Established June 2007 | Sussex Capital Trust II          
Debt Instrument [Line Items]          
Principal amount $ 12,500