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Document and Entity Information
Sep. 30, 2022
Cover [Abstract]  
Amendment Flag false
Entity Central Index Key 0001781730
Current Fiscal Year End Date --12-31
Document Type 8-K
Document Period End Date Sep. 30, 2022
Entity Registrant Name THIRD COAST BANCSHARES, INC.
Entity Incorporation State Country Code TX
Entity File Number 001-41028
Entity Tax Identification Number 46-2135597
Entity Address, Address Line One 20202 Highway 59 North
Entity Address, Address Line Two Suite 190
Entity Address, City or Town Humble
Entity Address, State or Province TX
Entity Address, Postal Zip Code 77338
City Area Code (281)
Local Phone Number 446-7000
Written Communications false
Soliciting Material false
Pre Commencement Tender Offer false
Pre Commencement Issuer Tender Offer false
Security 12b Title Common stock, par value $1.00 per share
Trading Symbol TCBX
Security Exchange Name NASDAQ
Entity Emerging Growth Company true
Entity Ex Transition Period false