v3.25.2
Cover Page - shares
 6 Months Ended
Jun. 30, 2025
Jul. 15, 2025
Entity Information [Line Items]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Jun. 30, 2025  
Document Transition Report false  
Entity File Number 001-34657  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 75-2679109  
Entity Address, Address Line One 2000 McKinney Avenue  
Entity Address, Address Line Two Suite 700  
Entity Address, City or Town Dallas  
Entity Address, State or Province TX  
Entity Address, Country US  
Entity Address, Postal Zip Code 75201  
City Area Code (214)  
Local Phone Number 932-6600  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Large Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   45,755,147
Entity Registrant Name TEXAS CAPITAL BANCSHARES INC/TX  
Entity Central Index Key 0001077428  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2025  
Document Fiscal Period Focus Q2  
Amendment Flag false  
Common Stock    
Entity Information [Line Items]    
Title of 12(b) Security Common Stock, par value $0.01 per share  
Trading Symbol TCBI  
Security Exchange Name NASDAQ  
Series B Preferred Stock    
Entity Information [Line Items]    
Title of 12(b) Security 5.75% Non-Cumulative Perpetual Preferred Stock Series B, par value $0.01 per share  
Trading Symbol TCBIO  
Security Exchange Name NASDAQ