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RELATED PARTY TRANSACTIONS (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
RELATED PARTY TRANSACTIONS
Deemed nonaccrual, past due, restructured or classified as potential problem loans	$ 0	$ 0
Unfunded loan commitments to related parties	69,700	48,600
Related party deposits	224,400	254,700
Advertising expense to related party	$ 192,000	$ 94,000

X

- Definition

The amount of advertising expense during the period with related party.

+ References

No definition available.

+ Details

Name:	cbtx_RelatedPartyTransactionAdvertisingExpense
Namespace Prefix:	cbtx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The amount of loans made to related parties deemed nonaccrual, past due, restructured or classified as potential problem loans.

+ References

No definition available.

+ Details

Name:	cbtx_RelatedPartyTransactionDeemedNonaccrualPastDueRestructuredOrClassifiedAsPotentialProblemLoans
Namespace Prefix:	cbtx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The amount of unfunded loan commitments with related parties.

+ References

No definition available.

+ Details

Name:	cbtx_RelatedPartyTransactionUnfundedLoanCommitments
Namespace Prefix:	cbtx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of deposits held by the entity for a related party (entity, shareholder, employee).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(k))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

+ Details

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

X

- References

No definition available.

+ Details

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