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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 | 3,696,000 tbk_TaxCreditCarryforwardAnnualLimitationsOnUseAmount |
Uncertain tax position | 0 us-gaap_UnrecognizedTaxBenefits | 0 us-gaap_UnrecognizedTaxBenefits
EJ Acquisition |  |
Income Taxes [Line Items] |  |
Tax credit carryforwards, annual limitation on use amount | 341,000 tbk_TaxCreditCarryforwardAnnualLimitationsOnUseAmount / us-gaap_BusinessAcquisitionAxis = tbk_EJAcquisitionMember |
NBI Acquisition |  |
Income Taxes [Line Items] |  |
Tax credit carryforwards, annual limitation on use amount | 2,040,000 tbk_TaxCreditCarryforwardAnnualLimitationsOnUseAmount / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember |
Federal |  |
Income Taxes [Line Items] |  |
Operating loss carryforwards, net | 33,444,000 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember | 37,048,000 us-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 | 17,477,000 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember / us-gaap_StatementGeographicalAxis = stpr_IL | 22,141,000 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember / us-gaap_StatementGeographicalAxis = stpr_IL
State | Iowa |  |
Income Taxes [Line Items] |  |
Operating loss carryforwards, net | 32,812,000 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember / us-gaap_StatementGeographicalAxis = stpr_IA | 33,189,000 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember / us-gaap_StatementGeographicalAxis = stpr_IA
State | Wisconsin |  |
Income Taxes [Line Items] |  |
Operating loss carryforwards, net | 2,645,000 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember / us-gaap_StatementGeographicalAxis = stpr_WI | 2,799,000 us-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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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 + Details
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- Definition Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns. + References 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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