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Summary of Significant Accounting Policies - Additional Information (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Summary Of Significant Accounting Policies [Line Items]      
Cash and cash equivalent maturity period 90 days    
Period of consumer loans charged off 120 days    
Useful life of assets 60 months    
Minimum probability for recognizing tax benefit 50.00%tbk_MinimumProbabilityForRecognizingTaxBenefit    
Unrecognized tax benefits $ 0us-gaap_UnrecognizedTaxBenefits $ 0us-gaap_UnrecognizedTaxBenefits  
Interest and tax penalties incurred $ 0us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense $ 0us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense $ 0us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense
Buildings and Improvements | Minimum      
Summary Of Significant Accounting Policies [Line Items]      
Useful life of assets 10 years    
Buildings and Improvements | Maximum      
Summary Of Significant Accounting Policies [Line Items]      
Useful life of assets 30 years    
Furniture, Fixtures and Equipment      
Summary Of Significant Accounting Policies [Line Items]      
Useful life of assets 5 years    
Single Family Residential Mortgage Loans      
Summary Of Significant Accounting Policies [Line Items]      
Number of days within which accrual of interest income discontinues 90 days    
Commercial Loans      
Summary Of Significant Accounting Policies [Line Items]      
Number of days within which accrual of interest income discontinues 90 days    
Commercial Real Estate Loans      
Summary Of Significant Accounting Policies [Line Items]      
Number of days within which accrual of interest income discontinues 90 days