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Income Taxes - Additional Information (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Income Taxes [Line Items]    
Tax credit carryforwards, annual limitation on use amount 3,696,000tbk_TaxCreditCarryforwardAnnualLimitationsOnUseAmount  
Uncertain tax position 0us-gaap_UnrecognizedTaxBenefits 0us-gaap_UnrecognizedTaxBenefits
EJ Acquisition    
Income Taxes [Line Items]    
Tax credit carryforwards, annual limitation on use amount 341,000tbk_TaxCreditCarryforwardAnnualLimitationsOnUseAmount
/ us-gaap_BusinessAcquisitionAxis
= tbk_EJAcquisitionMember
 
NBI Acquisition    
Income Taxes [Line Items]    
Tax credit carryforwards, annual limitation on use amount 2,040,000tbk_TaxCreditCarryforwardAnnualLimitationsOnUseAmount
/ us-gaap_BusinessAcquisitionAxis
= tbk_NbiAcquisitionMember
 
Federal    
Income Taxes [Line Items]    
Operating loss carryforwards, net 33,444,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember
37,048,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember
Federal | Earliest Tax Year    
Income Taxes [Line Items]    
Operating loss carryforwards, expiration year 2029 2029
State | Illinois    
Income Taxes [Line Items]    
Operating loss carryforwards, net 17,477,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember
/ us-gaap_StatementGeographicalAxis
= stpr_IL
22,141,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember
/ us-gaap_StatementGeographicalAxis
= stpr_IL
State | Iowa    
Income Taxes [Line Items]    
Operating loss carryforwards, net 32,812,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember
/ us-gaap_StatementGeographicalAxis
= stpr_IA
33,189,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember
/ us-gaap_StatementGeographicalAxis
= stpr_IA
State | Wisconsin    
Income Taxes [Line Items]    
Operating loss carryforwards, net 2,645,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember
/ us-gaap_StatementGeographicalAxis
= stpr_WI
2,799,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember
/ us-gaap_StatementGeographicalAxis
= stpr_WI
State | Earliest Tax Year    
Income Taxes [Line Items]    
Operating loss carryforwards, expiration year 2021 2021
State | Latest Tax Year    
Income Taxes [Line Items]    
Operating loss carryforwards, expiration year 2034 2034