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Cover Page - shares
3 Months Ended
Mar. 31, 2022
Apr. 29, 2022
Document Information [Line Items]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Mar. 31, 2022  
Document Transition Report false  
Entity File Number 000-55188  
Entity Registrant Name FRANKLIN BSP REALTY TRUST, INC.  
Entity Incorporation, State or Country Code MD  
Entity Tax Identification Number 46-1406086  
Entity Address, Address Line One 1345 Avenue of the Americas  
Entity Address, Address Line Two Suite 32A  
Entity Address, City or Town New York  
Entity Address, State or Province NY  
Entity Address, Postal Zip Code 10105  
City Area Code 212  
Local Phone Number 588-6770  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Non-accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   83,691,399
Entity Central Index Key 0001562528  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2022  
Document Fiscal Period Focus Q1  
Amendment Flag false  
Common Stock    
Document Information [Line Items]    
Title of 12(b) Security Common Stock, par value $0.01 per share  
Trading Symbol FBRT  
Security Exchange Name NYSE  
Series E Preferred Stock    
Document Information [Line Items]    
Title of 12(b) Security 7.50% Series E Cumulative Redeemable Preferred Stock, par value $0.01 per share  
Trading Symbol FBRT PRE  
Security Exchange Name NYSE