XML 12 R1.htm IDEA: XBRL DOCUMENT v3.24.1.1.u2
Document and Entity Information - shares
 3 Months Ended
Mar. 31, 2024
Jun. 21, 2024
Document and Entity Information [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Mar. 31, 2024  
Document Transition Report false  
Entity File Number 333-277776  
Entity Registrant Name Fifth District Bancorp, Inc.  
Entity Incorporation, State or Country Code MD  
Entity Tax Identification Number 99-1897673  
Entity Address, Postal Zip Code 70114  
Entity Address, Address Line One 4000 General DeGaulle Drive  
Entity Address, City or Town New Orleans  
Entity Address State Or Province LA  
City Area Code 504  
Local Phone Number 362-7544  
Entity Current Reporting Status No  
Entity Interactive Data Current Yes  
Entity Filer Category Non-accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company true  
Entity Ex Transition Period false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   0
Entity Central Index Key 0002012726  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2024  
Document Fiscal Period Focus Q1  
Amendment Flag false  
Title of 12(b) Security Not Applicable  
No Trading Symbol Flag true