v3.25.4
Cover - USD ($)
12 Months Ended
Dec. 31, 2025
Feb. 09, 2026
Jun. 30, 2025
Entity Information [Line Items]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2025    
Current Fiscal Year End Date --12-31    
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 Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
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    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 3,569,474,000
Entity Common Stock, Shares Outstanding   44,176,837  
Entity Registrant Name TEXAS CAPITAL BANCSHARES INC/TX    
Entity Central Index Key 0001077428    
Document Fiscal Year Focus 2025    
Document Fiscal Period Focus FY    
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