v3.26.1
Cover - shares
3 Months Ended
Mar. 31, 2026
Apr. 29, 2026
Cover [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Mar. 31, 2026  
Document Transition Report false  
Entity File Number 001-36448  
Entity Registrant Name Bankwell Financial Group, Inc.  
Entity Incorporation, State CT  
Entity Tax Identification Number 20-8251355  
Entity Address, Street 258 Elm Street  
Entity Address, City New Canaan  
Entity Address, State CT  
Entity Address, Postal Zip Code 06840  
City Area Code 203  
Local Phone Number 652-0166  
Title of Each Class Common Stock, no par value pershare  
Trading Symbol(s) BWFG  
Name of Each Exchange on Which Registered NASDAQ  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   7,973,180
Entity Central Index Key 0001505732  
Current Fiscal Year End Date --12-31  
Amendment Flag false  
Document Fiscal Year Focus 2026  
Document Fiscal Period Focus Q1