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Long-Term Debt (Details 1) - USD ($)
$ in Thousands
Mar. 31, 2021
Jan. 31, 2014
Sep. 21, 2012
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]      
Trust preferred securities issued   $ 175,000 $ 111,000
Texas Capital Bancshares Statutory Trust I      
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]      
Trust preferred securities issued $ 10,310    
Texas Capital Statutory Trust II      
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]      
Trust preferred securities issued 10,310    
Texas Capital Statutory Trust III      
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]      
Trust preferred securities issued 25,774    
Texas Capital Statutory Trust IV      
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]      
Trust preferred securities issued 25,774    
Texas Capital Statutory Trust V      
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]      
Trust preferred securities issued $ 41,238