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Summary of Significant Accounting Policies - Additional Information (Details) (USD $) | 12 Months Ended
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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 | $ 0 us-gaap_UnrecognizedTaxBenefits | $ 0 us-gaap_UnrecognizedTaxBenefits |
Interest and tax penalties incurred | $ 0 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense | $ 0 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense | $ 0 us-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 |  |

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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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