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Business Combinations and Divestitures - Summary of Fair Values of the Identifiable Assets Acquired and Liabilities Assumed (Details) (USD $) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Oct. 15, 2013
Liabilities assumed: |  |  |  |  |
Cash paid |  | $ 49,482,000 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired | $ (74,713,000)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired | $ 15,451,000 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired |
Goodwill |  | 1,921,000 us-gaap_GoodwillAcquiredDuringPeriod |  | 8,846,000 us-gaap_GoodwillAcquiredDuringPeriod |
Consideration Paid: |  |  |  |  |
Bargain purchase gain | (9,014,000)us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount |  | (9,014,000)us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount |  |
Doral Healthcare Acquisition |  |  |  |  |
Assets acquired: |  |  |  |  |
Loans |  | 45,334,000 us-gaap_BusinessCombinationAcquiredReceivablesFairValue / us-gaap_BusinessAcquisitionAxis = tbk_DoralHealthcareAcquisitionMember |  |  |
Intangible assets |  | 2,029,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = tbk_DoralHealthcareAcquisitionMember |  |  |
Premises and equipment |  | 50,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = tbk_DoralHealthcareAcquisitionMember |  |  |
Other assets |  | 276,000 tbk_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherAssets / us-gaap_BusinessAcquisitionAxis = tbk_DoralHealthcareAcquisitionMember |  |  |
Total Assets Acquired |  | 47,689,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets / us-gaap_BusinessAcquisitionAxis = tbk_DoralHealthcareAcquisitionMember |  |  |
Liabilities assumed: |  |  |  |  |
Customer deposits |  | 128,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedFinancialLiabilities / us-gaap_BusinessAcquisitionAxis = tbk_DoralHealthcareAcquisitionMember |  |  |
Fair value of net assets acquired |  | 47,561,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = tbk_DoralHealthcareAcquisitionMember |  |  |
Cash paid |  | 49,482,000 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / us-gaap_BusinessAcquisitionAxis = tbk_DoralHealthcareAcquisitionMember |  |  |
Goodwill |  | 1,921,000 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_BusinessAcquisitionAxis = tbk_DoralHealthcareAcquisitionMember |  |  |
NBI Acquisition |  |  |  |  |
Assets acquired: |  |  |  |  |
Loans | 568,358,000 us-gaap_BusinessCombinationAcquiredReceivablesFairValue / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember | 545,246,000 us-gaap_BusinessCombinationAcquiredReceivablesFairValue / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember | 568,358,000 us-gaap_BusinessCombinationAcquiredReceivablesFairValue / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember |  |
Intangible assets | 15,091,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember |  | 15,091,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember |  |
Premises and equipment | 19,358,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember |  | 19,358,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember |  |
Other assets | 22,023,000 tbk_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherAssets / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember |  | 22,023,000 tbk_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherAssets / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember |  |
Cash and cash equivalents | 89,990,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember |  | 89,990,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember |  |
Securities | 160,450,000 tbk_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedMarketableSecurities / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember |  | 160,450,000 tbk_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedMarketableSecurities / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember |  |
FHLB and Federal Reserve Bank stock | 4,507,000 tbk_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedRestrictedInvestments / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember |  | 4,507,000 tbk_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedRestrictedInvestments / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember |  |
Other real estate owned | 11,285,000 tbk_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherRealEstate / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember |  | 11,285,000 tbk_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherRealEstate / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember |  |
Bank-owned life insurance | 28,435,000 tbk_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBankOwnedLifeInsurance / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember |  | 28,435,000 tbk_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBankOwnedLifeInsurance / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember |  |
Deferred income taxes | 17,237,000 tbk_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssets / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember |  | 17,237,000 tbk_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssets / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember |  |
Total Assets Acquired | 936,734,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember |  | 936,734,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember |  |
Liabilities assumed: |  |  |  |  |
Customer deposits | 793,256,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedFinancialLiabilities / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember |  | 793,256,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedFinancialLiabilities / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember |  |
Customer repurchase agreements | 19,927,000 tbk_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedSecuritiesSoldUnderAgreementsToRepurchase / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember |  | 19,927,000 tbk_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedSecuritiesSoldUnderAgreementsToRepurchase / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember |  |
Senior secured note | 11,858,000 tbk_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedSeniorSecuredNote / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember |  | 11,858,000 tbk_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedSeniorSecuredNote / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember |  |
Junior subordinated debentures | 24,120,000 tbk_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedJuniorSubordinatedDebentures / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember |  | 24,120,000 tbk_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedJuniorSubordinatedDebentures / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember |  | 24,120,000 tbk_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedJuniorSubordinatedDebentures / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember
Federal Home Loan Bank advances | 5,003,000 tbk_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedFederalHomeLoanBankAdvances / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember |  | 5,003,000 tbk_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedFederalHomeLoanBankAdvances / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember |  |
Accrued interest and dividends payable | 7,282,000 tbk_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAccruedInterestAndDividendsPayable / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember |  | 7,282,000 tbk_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAccruedInterestAndDividendsPayable / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember |  |
Other liabilities | 7,988,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember |  | 7,988,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember |  |
Total liabilities | 869,434,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember |  | 869,434,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember |  |
Fair value of net assets acquired | 67,300,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember |  | 67,300,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember |  |
Cash paid to NBI common and preferred shareholders |  |  | 15,277,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember |  |
Consideration Paid: |  |  |  |  |
Consideration paid |  |  | 58,286,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember |  |
Bargain purchase gain |  |  | (9,014,000)us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember |  |
NBI Acquisition | Series B Preferred Stock |  |  |  |  |
Consideration Paid: |  |  |  |  |
Stock Issued or Assumed |  |  | 5,196,000 us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |
NBI Acquisition | Common Stock |  |  |  |  |
Consideration Paid: |  |  |  |  |
Stock Issued or Assumed |  |  | 11,916,000 us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
NBI Acquisition | Preferred Stock |  |  |  |  |
Consideration Paid: |  |  |  |  |
Stock Issued or Assumed |  |  | $ 25,897,000 us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable / us-gaap_BusinessAcquisitionAxis = tbk_NbiAcquisitionMember / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember |  |

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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 In a business combination in which the amount of net identifiable assets acquired and liabilities assumed exceeds the aggregate consideration transferred or to be transferred (as defined), this element represents the amount of gain recognized by the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (f)(1) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6571-128477 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6527-128477 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6396-128476 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6387-128476 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6393-128476 + Details
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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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- Definition Amount of equity interests of the acquirer, including instruments or interests issued or issuable in consideration for the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 + Details
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- Definition Amount of assets acquired at the acquisition date. + 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 (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions, acquired at the acquisition date. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + 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 (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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- Definition The amount of financial liabilities assumed (as defined) which have been recognized as of the acquisition date. + 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 (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=35744172&loc=d3e2207-128464 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financial Liability -URI http://asc.fasb.org/extlink&oid=6513127 + Details
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- Definition Amount of intangible assets, excluding goodwill, acquired at the acquisition date. + 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 (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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- Definition Amount of liabilities assumed at the acquisition date. + 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 (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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- Definition Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed. + 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 (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=35744172&loc=d3e2207-128464 + Details
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- Definition Amount of other liabilities due after one year or the normal operating cycle, if longer, assumed at the acquisition date. + 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 (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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