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Cover
Nov. 05, 2021
Cover [Abstract]  
Document Type 8-K
Amendment Flag false
Document Period End Date Nov. 05, 2021
Entity File Number 001-38280
Entity Registrant Name CBTX, Inc.
Entity Central Index Key 0001473844
Entity Tax Identification Number 20-8339782
Entity Incorporation, State or Country Code TX
Entity Address, Address Line One 9 Greenway Plaza
Entity Address, Address Line Two Suite 110
Entity Address, City or Town Houston
Entity Address, State or Province TX
Entity Address, Postal Zip Code 77046
City Area Code (713)
Local Phone Number 210-7600
Written Communications true
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Title of 12(b) Security Common stock, par value $0.01 per share
Trading Symbol CBTX
Security Exchange Name NASDAQ
Entity Emerging Growth Company true
Elected Not To Use the Extended Transition Period true