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Long-Term Debt (Details) - USD ($)
3 Months Ended
Mar. 09, 2021
Mar. 31, 2021
Mar. 31, 2020
Jan. 31, 2014
Sep. 21, 2012
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]          
Trust preferred securities issued       $ 175,000,000.0 $ 111,000,000.0
Stated interest rate       5.25% 6.50%
Reference pool of mortgage warehouse loans   $ 2,200,000,000      
Limit for loss risk transferred   $ 275,000,000.0      
Senior Unsecured Credit-Linked Notes          
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]          
Face amount $ 275,000,000        
Weighted-average interest rate during the year   5.54%      
LIBOR | Minimum | Senior Unsecured Credit-Linked Notes          
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]          
Interest rate on subordinated debentures, spread on variable rate 4.50%        
LIBOR | Maximum | Senior Unsecured Credit-Linked Notes          
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]          
Interest rate on subordinated debentures, spread on variable rate 4.25%        
Texas Capital Bancshares Statutory Trust I          
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]          
Trust preferred securities issued   $ 10,310,000      
Texas Capital Statutory Trust II          
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]          
Trust preferred securities issued   10,310,000      
Texas Capital Statutory Trust III          
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]          
Trust preferred securities issued   25,774,000      
Texas Capital Statutory Trust IV          
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]          
Trust preferred securities issued   25,774,000      
Texas Capital Statutory Trust V          
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]          
Trust preferred securities issued   41,238,000      
Trust preferred subordinated debentures          
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]          
Total borrowings   $ 113,400,000      
Weighted-average interest rate during the year   2.19% 3.80%    
Trust preferred subordinated debentures | Texas Capital Bancshares Statutory Trust I | LIBOR          
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]          
Interest rate on subordinated debentures, spread on variable rate   3.35%      
Trust preferred subordinated debentures | Texas Capital Statutory Trust II | LIBOR          
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]          
Interest rate on subordinated debentures, spread on variable rate   3.25%      
Trust preferred subordinated debentures | Texas Capital Statutory Trust III | LIBOR          
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]          
Interest rate on subordinated debentures, spread on variable rate   1.51%      
Trust preferred subordinated debentures | Texas Capital Statutory Trust IV | LIBOR          
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]          
Interest rate on subordinated debentures, spread on variable rate   1.71%      
Trust preferred subordinated debentures | Texas Capital Statutory Trust V | LIBOR          
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]          
Interest rate on subordinated debentures, spread on variable rate   1.60%