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RELATED PARTY TRANSACTIONS (Details) - USD ($) $ in Thousands | 12 Months Ended
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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