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Business Combinations and Divestitures - Summary of Non-Purchase credit Impaired Loans Acquired in Business Combination (Details) (NBI Acquisition, USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Business Acquisition [Line Items] |  |
Contractual Balance | $ 562,658 us-gaap_BusinessCombinationAcquiredReceivablesGrossContractualAmount |
Fair Value | 545,246 us-gaap_BusinessCombinationAcquiredReceivablesFairValue | 568,358 us-gaap_BusinessCombinationAcquiredReceivablesFairValue
Estimated Contractual Cash Flow Not Expected to be Collected | (15,298)us-gaap_BusinessCombinationAcquiredReceivablesEstimatedUncollectible |
Commercial real estate |  |
Business Acquisition [Line Items] |  |
Contractual Balance | 223,477 us-gaap_BusinessCombinationAcquiredReceivablesGrossContractualAmount / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember |
Fair Value | 217,711 us-gaap_BusinessCombinationAcquiredReceivablesFairValue / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember |
Estimated Contractual Cash Flow Not Expected to be Collected | (6,567)us-gaap_BusinessCombinationAcquiredReceivablesEstimatedUncollectible / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember |
Construction, land development, land |  |
Business Acquisition [Line Items] |  |
Contractual Balance | 25,844 us-gaap_BusinessCombinationAcquiredReceivablesGrossContractualAmount / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = tbk_ConstructionLandDevelopmentLandPortfolioSegmentMember |
Fair Value | 23,474 us-gaap_BusinessCombinationAcquiredReceivablesFairValue / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = tbk_ConstructionLandDevelopmentLandPortfolioSegmentMember |
Estimated Contractual Cash Flow Not Expected to be Collected | (1,585)us-gaap_BusinessCombinationAcquiredReceivablesEstimatedUncollectible / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = tbk_ConstructionLandDevelopmentLandPortfolioSegmentMember |
1-4 family residential properties |  |
Business Acquisition [Line Items] |  |
Contractual Balance | 93,868 us-gaap_BusinessCombinationAcquiredReceivablesGrossContractualAmount / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember |
Fair Value | 89,822 us-gaap_BusinessCombinationAcquiredReceivablesFairValue / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember |
Estimated Contractual Cash Flow Not Expected to be Collected | (2,520)us-gaap_BusinessCombinationAcquiredReceivablesEstimatedUncollectible / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember |
Farmland |  |
Business Acquisition [Line Items] |  |
Contractual Balance | 35,502 us-gaap_BusinessCombinationAcquiredReceivablesGrossContractualAmount / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = tbk_FarmlandPortfolioSegmentMember |
Fair Value | 35,634 us-gaap_BusinessCombinationAcquiredReceivablesFairValue / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = tbk_FarmlandPortfolioSegmentMember |
Estimated Contractual Cash Flow Not Expected to be Collected | (74)us-gaap_BusinessCombinationAcquiredReceivablesEstimatedUncollectible / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = tbk_FarmlandPortfolioSegmentMember |
Commercial Loans |  |
Business Acquisition [Line Items] |  |
Contractual Balance | 170,070 us-gaap_BusinessCombinationAcquiredReceivablesGrossContractualAmount / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember |
Fair Value | 164,855 us-gaap_BusinessCombinationAcquiredReceivablesFairValue / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember |
Estimated Contractual Cash Flow Not Expected to be Collected | (3,914)us-gaap_BusinessCombinationAcquiredReceivablesEstimatedUncollectible / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember |
Consumer |  |
Business Acquisition [Line Items] |  |
Contractual Balance | 13,897 us-gaap_BusinessCombinationAcquiredReceivablesGrossContractualAmount / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember |
Fair Value | 13,750 us-gaap_BusinessCombinationAcquiredReceivablesFairValue / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember |
Estimated Contractual Cash Flow Not Expected to be Collected | $ (638)us-gaap_BusinessCombinationAcquiredReceivablesEstimatedUncollectible / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember |

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- Definition For receivables acquired in a business combination, excluding certain loans and debt securities acquired in a transfer (as defined), this element represents the best estimate at the acquisition date of the contractual cash flows not expected to be collected, by major class of receivable, such as loans, direct finance leases (as defined), and any other class of receivables. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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- Definition For receivables acquired in a business combination, excluding certain loans and debt securities acquired in a transfer (as defined), this element represents the fair value of the receivables acquired, by major class of receivable, such as loans, direct finance leases (as defined), and any other class of receivables. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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- Definition For receivables acquired in a business combination, excluding certain loans and debt securities acquired in a transfer (as defined), this element represents the gross contractual amounts receivable, by major class of receivable, such as loans, direct finance leases (as defined), and any other class of receivables. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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