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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

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Unrecognized Tax Benefit

-URI http://asc.fasb.org/extlink&oid=6527854



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