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Document and Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2023
Feb. 19, 2024
Jun. 30, 2023
Document Information [Line Items]      
Document Type 10-K    
Document Annual Report true    
Document Transition Report false    
Document Period End Date Dec. 31, 2023    
Entity File Number 001-38412    
Entity Registrant Name Bridgewater Bancshares Inc    
Entity Incorporation, State or Country Code MN    
Entity Tax Identification Number 26-0113412    
Entity Address, Address Line One 4450 Excelsior Boulevard, Suite 100    
Entity Address, City or Town St. Louis Park    
Entity Address, State or Province MN    
Entity Address, Postal Zip Code 55416    
City Area Code 952    
Local Phone Number 893-6868    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Auditor Name RSM US LLP    
Auditor Firm ID 49    
Auditor Location Des Moines, Iowa    
Entity Shell Company false    
Document Financial Statement Error Correction [Flag] false    
Entity Common Stock, Shares Outstanding   27,709,819  
Entity Public Float     $ 220,829,455
Current Fiscal Year End Date --12-31    
Document Fiscal Year Focus 2023    
Document Fiscal Period Focus FY    
Entity Central Index Key 0001341317    
Amendment Flag false    
Common Stock      
Document Information [Line Items]      
Title of 12(b) Security Common Stock, $0.01 Par Value    
Trading Symbol BWB    
Security Exchange Name NASDAQ    
Depositary Shares      
Document Information [Line Items]      
Title of 12(b) Security Depositary Shares    
Trading Symbol BWBBP    
Security Exchange Name NASDAQ