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Document and Entity Information
Aug. 31, 2020
Document And Entity Information [Line Items]  
Document Type 8-K
Amendment Flag false
Document Period End Date Aug. 31, 2020
Entity Registrant Name TRIUMPH BANCORP, INC.
Entity Central Index Key 0001539638
Entity Emerging Growth Company false
Entity File Number 001-36722
Entity Incorporation, State or Country Code TX
Entity Tax Identification Number 20-0477066
Entity Address, Address Line One 12700 Park Central Drive, Suite 1700
Entity Address, City or Town Dallas
Entity Address, State or Province TX
Entity Address, Postal Zip Code 75251
City Area Code 214
Local Phone Number 365-6900
Written Communications false
Soliciting Material false
Pre Commencement Tender Offer false
Pre Commencement Issuer Tender Offer false
Security 12b Title Depositary Shares Each Representing a 1/40th Interest in a Share of 7.125% Series C Fixed-Rate Non-Cumulative Perpetual Preferred Stock
Trading Symbol TBKCP
Security Exchange Name NASDAQ
Common Stock [Member]  
Document And Entity Information [Line Items]  
Security 12b Title Common stock, par value $0.01 per share
Trading Symbol TBK
Security Exchange Name NASDAQ