Loans and leases receivable investment net of unpaid principal.

No definition available.

Name:	tbk_LoansAndLeasesReceivableInvestmentNetOfUnpaidPrincipal
Namespace Prefix:	tbk_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Loans and leases receivable unpaid principal.

+ References

No definition available.

+ Details

Name:	tbk_LoansAndLeasesReceivableUnpaidPrincipal
Namespace Prefix:	tbk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_AccountsNotesAndLoansReceivableLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.7(d))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (b)(1)(ii)
-URI http://asc.fasb.org/extlink&oid=82894903&loc=d3e15032-111544

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524

Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section S99
-Paragraph 4
-Subparagraph (SAB Topic 6.L.1)
-URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74567-122707

+ Details

Name:	us-gaap_LoansAndLeasesReceivableAllowance
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

+ References

+ Details

Name:	us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.7)
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

+ Details

Name:	us-gaap_LoansAndLeasesReceivableNetReportedAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialRealEstatePortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=tbk_ConstructionLandDevelopmentLandPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ResidentialPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=tbk_FarmlandPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=tbk_FactoredReceivablesSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ConsumerPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=tbk_MortgageWarehouseSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Loans and Allowance for Loan and Lease Losses - Schedule of Recorded Investment and Unpaid Principal for Impaired Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Jun. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2016
Accounts Notes And Loans Receivable [Line Items]
Loan, Total	$ 3,512,143		$ 2,810,856
Unpaid Principal	3,536,148		2,832,506
Difference	(24,005)		(21,650)
Allowance for loan and lease losses	(27,256)	$ (24,547)	(18,748)	$ (20,367)	$ (19,797)	$ (15,405)
Loans, net	3,484,887		2,792,108
Commercial real estate
Accounts Notes And Loans Receivable [Line Items]
Loan, Total	906,494		745,893
Unpaid Principal	914,503		753,803
Difference	(8,009)		(7,910)
Allowance for loan and lease losses	(4,042)	(3,803)	(3,435)	(2,564)	(2,506)	(1,813)
Construction, land development, land
Accounts Notes And Loans Receivable [Line Items]
Loan, Total	190,920		134,812
Unpaid Principal	195,075		138,045
Difference	(4,155)		(3,233)
Allowance for loan and lease losses	(1,271)	(1,025)	(883)	(1,125)	(915)	(465)
1-4 family residential properties
Accounts Notes And Loans Receivable [Line Items]
Loan, Total	194,752		125,827
Unpaid Principal	196,361		127,499
Difference	(1,609)		(1,672)
Allowance for loan and lease losses	(259)	(240)	(293)	(282)	(149)	(253)
Farmland
Accounts Notes And Loans Receivable [Line Items]
Loan, Total	177,313		180,141
Unpaid Principal	180,599		184,006
Difference	(3,286)		(3,865)
Allowance for loan and lease losses	(503)	(509)	(310)	(239)	(261)	(170)
Commercial Loans
Accounts Notes And Loans Receivable [Line Items]
Loan, Total	1,123,598		920,812
Unpaid Principal	1,127,844		924,133
Difference	(4,246)		(3,321)
Allowance for loan and lease losses	(12,753)	(10,230)	(8,150)	(10,148)	(10,603)	(8,014)
Factored receivables
Accounts Notes And Loans Receivable [Line Items]
Loan, Total	611,285		374,410
Unpaid Principal	613,832		376,046
Difference	(2,547)		(1,636)
Allowance for loan and lease losses	(7,571)	(7,727)	(4,597)	(5,046)	(4,507)	(4,088)
Consumer
Accounts Notes And Loans Receivable [Line Items]
Loan, Total	31,423		31,131
Unpaid Principal	31,576		31,144
Difference	(153)		(13)
Allowance for loan and lease losses	(581)	(670)	(783)	(743)	(627)	(420)
Mortgage warehouse
Accounts Notes And Loans Receivable [Line Items]
Loan, Total	276,358		297,830
Unpaid Principal	276,358		297,830
Allowance for loan and lease losses	$ (276)	$ (343)	$ (297)	$ (220)	$ (229)	$ (182)