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Cover Page - USD ($)
 12 Months Ended
Dec. 31, 2019
Feb. 25, 2020
Jun. 30, 2019
Cover page.      
Document Type 10-K/A    
Document Annual Report true    
Document Period End Date Dec. 31, 2019    
Document Transition Report false    
Entity File Number 000-17820    
Entity Registrant Name LAKELAND BANCORP, INC    
Entity Incorporation, State or Country Code NJ    
Entity Tax Identification Number 22-2953275    
Entity Address, Address Line One 250 Oak Ridge Road    
Entity Address, City or Town Oak Ridge    
Entity Address, State or Province NJ    
Entity Address, Postal Zip Code 07438    
City Area Code 973    
Local Phone Number 697-2000    
Title of 12(b) Security Common Stock, no par value    
Trading Symbol LBAI    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Public Float     $ 780,779,539
Entity Common Stock, Shares Outstanding (in shares)   50,513,886  
Documents Incorporated by Reference
Lakeland Bancorp, Inc. Proxy Statement for its 2020 Annual Meeting of Shareholders (Part III).
    
Amendment Flag false    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Entity Central Index Key 0000846901    
Current Fiscal Year End Date --12-31