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Document And Entity Information - shares
 6 Months Ended
Jun. 30, 2024
Aug. 05, 2024
Cover [Abstract]    
Entity Registrant Name PROSPERITY BANCSHARES, INC.  
Entity Central Index Key 0001068851  
Trading Symbol PB  
Current Fiscal Year End Date --12-31  
Entity Filer Category Large Accelerated Filer  
Document Type 10-Q  
Document Period End Date Jun. 30, 2024  
Document Fiscal Year Focus 2024  
Document Fiscal Period Focus Q2  
Amendment Flag false  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Common Stock, Shares Outstanding (in shares)   95,261,166
Entity Current Reporting Status Yes  
Entity File Number 001-35388  
Entity Incorporation, State or Country Code TX  
Entity Tax Identification Number 74-2331986  
Entity Address, Address Line One Prosperity Bank Plaza  
Entity Address, Address Line Two 4295 San Felipe  
Entity Address, City or Town Houston  
Entity Address, State or Province TX  
Entity Address, Postal Zip Code 77027  
City Area Code 281  
Local Phone Number 269-7199  
Entity Shell Company false  
Entity Interactive Data Current Yes  
Title of 12(b) Security Common stock, par value $1.00 per share  
Security Exchange Name NYSE  
Document Quarterly Report true  
Document Transition Report false