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Fair Value Disclosures - Indemnification Asset (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Indemnification Asset [Roll Forward] |  |  |
Beginning balance | $ 36,225 |  |
Indemnification reduction | (35,633) | $ 0 | $ 0
Ending balance | 4,786 | 36,225 |
Level 3 |  |  |
Indemnification Asset [Roll Forward] |  |  |
Beginning balance | 36,225 | 0 | 0
Indemnification asset recognized in business combination | 0 | 30,959 | 0
Change in fair value of indemnification asset recognized in earnings | 4,194 | 5,266 | 0
Indemnification reduction | (35,633) | 0 | 0
Ending balance | $ 4,786 | $ 36,225 | $ 0

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- Definition Business Combination, Indemnification Asset + References No definition available. + Details
Name: | tbk_BusinessCombinationIndemnificationAsset
Namespace Prefix: | tbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Business Combination, Indemnification Asset, Acquisitions + References No definition available. + Details
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Namespace Prefix: | tbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Business Combination, Indemnification Asset, Change in Fair Value + References No definition available. + Details
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Namespace Prefix: | tbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- 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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
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- Definition Amount of settlements of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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Balance Type: | debit
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- Details
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Data Type: | na
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Period Type: |