Loans and Allowance for Loan and Lease Losses - Summary of Allowance for Loan and Lease Losses (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	$ 13,772	$ 11,462	$ 12,567	$ 8,843
Provision for loan losses	2,819	165	4,247	3,351
Charge-offs	(1,972)	(198)	(2,818)	(1,097)
Recoveries	293	115	916	447
Ending Balance	14,912	11,544	14,912	11,544
Commercial real estate
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	1,792	1,214	1,489	533
Provision for loan losses	123	189	413	962
Charge-offs	(4)	(9)	(5)	(152)
Recoveries	1	1	15	52
Ending Balance	1,912	1,395	1,912	1,395
Construction, land development, land
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	181	346	367	333
Provision for loan losses	44	97	(142)	110
Recoveries	7		7
Ending Balance	232	443	232	443
1-4 family residential properties
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	259	251	274	215
Provision for loan losses	(10)	44	(38)	163
Charge-offs		(20)	(63)	(203)
Recoveries	6	4	82	104
Ending Balance	255	279	255	279
Farmland
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	143	28	134	19
Provision for loan losses	(22)	1	(13)	10
Ending Balance	121	29	121	29
Commercial Loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	6,697	5,064	5,276	4,003
Provision for loan losses	2,521	210	3,680	1,312
Charge-offs	(1,615)		(1,784)	(47)
Recoveries	217	34	648	40
Ending Balance	7,820	5,308	7,820	5,308
Factored receivables
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	4,204	4,135	4,509	3,462
Provision for loan losses	(7)	(475)	77	529
Charge-offs	(285)	(72)	(743)	(451)
Recoveries	33	21	102	69
Ending Balance	3,945	3,609	3,945	3,609
Consumer
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	293	160	216	140
Provision for loan losses	114	107	313	147
Charge-offs	(68)	(97)	(223)	(244)
Recoveries	29	55	62	182
Ending Balance	368	225	368	225
Mortgage warehouse
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	203	264	302	138
Provision for loan losses	56	(8)	(43)	118
Ending Balance	$ 259	$ 256	$ 259	$ 256

Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts.

Name:	us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

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

- Definition

Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss.

+ References

+ Details

Name:	us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-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 4: http://www.xbrl.org/2003/role/presentationRef
-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

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-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=6379141&loc=d3e15032-111544

+ Details

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

- Definition

Amount of expense related to estimated loss from loan and lease transactions.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.11)
-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524

+ Details

Name:	us-gaap_ProvisionForLoanAndLeaseLosses
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- 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: